General Electric Co
General ElActive Patents
0
Total Holdings
4459
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| EP0681230A1 | Navigation system | Expired / Lapsed | 1995-04-21 | — | 3 | Details |
| EP0635238A1 | Tumor tissue characterization apparatus and method | Expired / Lapsed | 1994-07-14 | — | 19 | Details |
| CA2068159A1 | Generalized viterbi algorithm with tail-biting | Expired / Lapsed | 1992-05-07 | — | 12 | Details |
| EP0426464A2 | Computerized tomographic image reconstruction method for he… | Expired / Lapsed | 1990-11-01 | — | 18 | Details |
| EP0372789A3 | Apparatus for machining intricate feature cuts in thin wall… | Expired / Lapsed | 1989-11-28 | — | 0 | Details |
| EP0370341A2 | Method for reducing motion induced image artifacts in proje… | Expired / Lapsed | 1989-11-11 | — | 22 | Details |
| EP0349231A2 | Nuclear magnetic resonance flow-contrast angiography | Expired / Lapsed | 1989-06-26 | — | 29 | Details |
| EP0320303A2 | Coherent beam formation | Expired / Lapsed | 1988-12-09 | — | 22 | Details |
| EP0309750A2 | Aluminum phosphate cement compositions and lamp assemblies … | Expired / Lapsed | 1988-08-30 | — | 20 | Details |
| EP0275192A2 | Reconfigurable integrated controls and displays for a turbo… | Expired / Lapsed | 1988-01-13 | — | 8 | Details |
| EP0220631A1 | Adaptive time gain compensation system for ultrasound imagi… | Expired / Lapsed | 1986-10-17 | — | 4 | Details |
| EP0156239A2 | A plug for horizontal cryostat penetration | Expired / Lapsed | 1985-03-12 | — | 18 | Details |
| EP0144924A2 | True-perspective texture/shading processor | Expired / Lapsed | 1984-11-29 | — | 12 | Details |
| EP0142760A2 | Inductively coupled multi-section radio frequency field coi… | Expired / Lapsed | 1984-11-03 | — | 35 | Details |
| EP0137420A2 | A method for rapid acquisition of NMR data | Expired / Lapsed | 1984-09-27 | — | 22 | Details |
| GB2149510A | Patient alignment system for nmr studies | Expired / Lapsed | 1984-09-17 | — | 13 | Details |
| EP0091008A2 | Method of three-dimensional NMR imaging using selective exc… | Expired / Lapsed | 1983-03-23 | — | 34 | Details |
| EP0077899A2 | Parallax corrected external alignment lights | Expired / Lapsed | 1982-08-25 | — | 10 | Details |
| EP0077447A2 | Sectional X-ray table having dual servo drives | Expired / Lapsed | 1982-08-20 | — | 9 | Details |
| EP0064623A2 | Video-photo frame size coordinator | Expired / Lapsed | 1982-04-21 | — | 9 | Details |
| DE2903982A1 | PROCESS FOR DESULFURIZING COAL | Expired / Lapsed | 1979-02-02 | — | 0 | Details |
| EP0003116A1 | Composite compact components fabricated with high temperatu… | Expired / Lapsed | 1979-01-08 | — | 10 | Details |
| GB2011075A | Ultrasonic imaging systems | Expired / Lapsed | 1978-12-20 | — | 0 | Details |
| FR2406204A1 | METHOD AND DEVICE FOR POSITION DETERMINATION BY SATELLITES | Expired / Lapsed | 1978-10-17 | — | 0 | Details |
| DE2845071A1 | PROCEDURE AND EQUIPMENT FOR POSITION MONITORING WITH SATELL… | Expired / Lapsed | 1978-10-16 | — | 0 | Details |
| DE2843812A1 | METHOD AND ARRANGEMENT FOR RADIO LOCATION WITH THE AID OF S… | Expired / Lapsed | 1978-10-07 | — | 0 | Details |
| DE2756110A1 | DIAGNOSTIC EQUIPMENT AND METHOD FOR MANUFACTURING IT | Expired / Lapsed | 1977-12-16 | — | 0 | Details |
| DE2638250A1 | Detecting antibodies by complex formation with antigens - s… | Expired / Lapsed | 1976-08-25 | — | 0 | Details |
| DE2624692A1 | MAGNETO-OPTICAL CONVERTER | Expired / Lapsed | 1976-06-02 | — | 0 | Details |
| DE2433246A1 | Detection and purification of immunoreactive proteins - by … | Expired / Lapsed | 1974-07-11 | — | 0 | Details |
| DE2330702A1 | METHOD AND APPARATUS FOR DETECTION AND PURIFICATION OF PROT… | Expired / Lapsed | 1973-06-16 | — | 0 | Details |
| DE2130630A1 | Antithrombogenic surfaces | Expired / Lapsed | 1971-06-21 | — | 0 | Details |
| DE1946931A1 | Method for testing circuits and devices for carrying out th… | Expired / Lapsed | 1969-09-17 | — | 0 | Details |
| DE1933684A1 | Process for producing oversized fits | Expired / Lapsed | 1969-07-03 | — | 0 | Details |
| GB1080658A | Improvements in or relating to battery chargers | Expired / Lapsed | 1966-05-04 | — | 0 | Details |
| GB945249A | Improvements in semiconductor devices | Expired / Lapsed | 1960-09-06 | — | 0 | Details |
| GB854564A | Improvements in coil structure for electrical apparatus | Expired / Lapsed | 1959-01-13 | — | 0 | Details |
| GB830644A | Improvements in electrical insulation material | Expired / Lapsed | 1958-07-18 | — | 0 | Details |
| GB740037A | Improvements relating to rotary fluid flow measuring appara… | Expired / Lapsed | 1954-03-22 | — | 0 | Details |
| GB738216A | Improvements in and relating to broad area transistors | Expired / Lapsed | 1953-06-15 | — | 0 | Details |
| GB726363A | Improvements in and relating to machine supports | Expired / Lapsed | 1953-06-01 | — | 0 | Details |
| GB725412A | Improvements relating to methods of making small apertures … | Expired / Lapsed | 1953-01-06 | — | 0 | Details |
| GB551767A | Improvements in and relating to control apparatus for vapou… | Expired / Lapsed | 1941-12-15 | — | 0 | Details |
| AU288839A | Improvements in optical projection apparatus | Expired / Lapsed | 1939-06-27 | — | 0 | Details |
| GB426324A | Improvements in and relating to methods of covering bodies … | Expired / Lapsed | 1933-06-30 | — | 0 | Details |
| GB418659A | Improvements in and relating to dynamo electric machines | Expired / Lapsed | 1933-01-28 | — | 0 | Details |
| GB387902A | Improvements in and relating to expansion vessels | Expired / Lapsed | 1932-06-13 | — | 0 | Details |
| GB379883A | Improvements in and relating to methods of hermetically sea… | Expired / Lapsed | 1931-09-29 | — | 0 | Details |
| GB392145A | Improvements in and relating to means for preventing the er… | Expired / Lapsed | 1931-08-07 | — | 0 | Details |
| GB365963A | Improvements in and relating to centrifuges for the product… | Expired / Lapsed | 1931-06-12 | — | 0 | Details |
| GB368775A | Improvements in and relating to telemetering systems | Expired / Lapsed | 1930-12-03 | — | 0 | Details |
| GB348360A | Improvements in or relating to methods of making electrodes… | Expired / Lapsed | 1930-04-29 | — | 0 | Details |
| GB256652A | Improvements in or relating to voltage or current regulators | Expired / Lapsed | 1926-08-10 | — | 0 | Details |
| GB190657A | Improvements in and relating to pyrometers | Expired / Lapsed | 1922-01-27 | — | 0 | Details |
| US7232463B2 | Intervertebral cage designs | Expired / Lapsed | 2003-10-23 | 2007-06-19 | 15 | Details |
| US6994727B2 | Total disc implant | Expired / Lapsed | 2003-12-15 | 2006-02-07 | 27 | Details |
| US6438403B1 | Method and apparatus for cardiac analysis using four-dimens… | Expired / Lapsed | 1999-11-01 | 2002-08-20 | 15 | Details |
| US6275560B1 | Cardiac gated computed tomography system | Expired / Lapsed | 1998-12-22 | 2001-08-14 | 18 | Details |
| US6249693B1 | Method and apparatus for cardiac analysis using four-dimens… | Expired / Lapsed | 1999-11-01 | 2001-06-19 | 23 | Details |
| US6058218A | Enhanced visualization of weak image sources in the vicinit… | Expired / Lapsed | 1997-11-10 | 2000-05-02 | 14 | Details |
| US6031374A | Method for extracting deformations from velocity-encoded ma… | Expired / Lapsed | 1997-09-25 | 2000-02-29 | 14 | Details |
| US5997883A | Retrospective ordering of segmented MRI cardiac data using … | Expired / Lapsed | 1997-07-01 | 1999-12-07 | 11 | Details |
| US5954649A | Catheter system having ultrasound locating capabilities | Expired / Lapsed | 1997-10-20 | 1999-09-21 | 18 | Details |
| US5792162A | Guarded surgical scalpel with scalpel blade remover | Expired / Lapsed | 1996-05-08 | 1998-08-11 | 12 | Details |
| US5752968A | Guarded surgical scalpel with scalpel blade remover | Expired / Lapsed | 1995-01-27 | 1998-05-19 | 18 | Details |
| US5730129A | Imaging of interventional devices in a non-stationary subje… | Expired / Lapsed | 1995-04-03 | 1998-03-24 | 6 | Details |
| US5657757A | Interleaved MR spectroscopy and imaging with dynamically ch… | Expired / Lapsed | 1995-08-17 | 1997-08-19 | 12 | Details |
| US5611025A | Virtual internal cavity inspection system | Expired / Lapsed | 1994-11-23 | 1997-03-11 | 9 | Details |
| US5590429A | Electrophysiology table | Expired / Lapsed | 1995-09-13 | 1997-01-07 | 12 | Details |
| US5568931A | Brush seal | Expired / Lapsed | 1992-08-20 | 1996-10-29 | 4 | Details |
| US5517537A | Integrated acoustic leak detection beamforming system | Expired / Lapsed | 1994-08-18 | 1996-05-14 | 23 | Details |
| US5494756A | Method for wet chemical surface modification of formed poly… | Expired / Lapsed | 1993-05-14 | 1996-02-27 | 31 | Details |
| US5487306A | Phase aberration correction in phased-array imaging systems | Expired / Lapsed | 1994-09-26 | 1996-01-30 | 18 | Details |
| US5482046A | Acoustic power control technique | Expired / Lapsed | 1994-11-23 | 1996-01-09 | 10 | Details |
| EP0442303B1 | CVD Diamond workpieces and their fabrication | Expired / Lapsed | 1991-01-25 | 1995-12-06 | 9 | Details |
| US5458126A | Cardiac functional analysis system employing gradient image… | Expired / Lapsed | 1994-02-24 | 1995-10-17 | 6 | Details |
| US5458120A | Ultrasonic transducer with magnetostrictive lens for dynami… | Expired / Lapsed | 1993-12-08 | 1995-10-17 | 27 | Details |
| US5445150A | Invasive system employing a radiofrequency tracking system | Expired / Lapsed | 1993-01-29 | 1995-08-29 | 5 | Details |
| US5440544A | Integrated data link concept for air traffic control applic… | Expired / Lapsed | 1993-12-27 | 1995-08-08 | 12 | Details |
| US5433199A | Cardiac functional analysis method using gradient image seg… | Expired / Lapsed | 1994-02-24 | 1995-07-18 | 5 | Details |
| US5388461A | Beamforming time delay correction for a multi-element array… | Expired / Lapsed | 1994-01-18 | 1995-02-14 | 13 | Details |
| US5377680A | MRI cardiac image produced by temporal data sharing | Expired / Lapsed | 1993-08-04 | 1995-01-03 | 9 | Details |
| US5377678A | Tracking system to follow the position and orientation of a… | Expired / Lapsed | 1993-07-14 | 1995-01-03 | 21 | Details |
| US5366331A | Shape memory lock fastener | Expired / Lapsed | 1993-02-10 | 1994-11-22 | 20 | Details |
| US5349525A | Color flow imaging system utilizing a frequency domain wall… | Expired / Lapsed | 1993-01-08 | 1994-09-20 | 15 | Details |
| US5329930A | Phased array sector scanner with multiplexed acoustic trans… | Expired / Lapsed | 1993-10-12 | 1994-07-19 | 14 | Details |
| US5318025A | Tracking system to monitor the position and orientation of … | Expired / Lapsed | 1992-04-01 | 1994-06-07 | 19 | Details |
| US5298026A | Method and apparatus for laser medical treatment | Expired / Lapsed | 1992-07-23 | 1994-03-29 | 23 | Details |
| US5293126A | Local transverse gradient coil | Expired / Lapsed | 1992-11-09 | 1994-03-08 | 7 | Details |
| US5290266A | Flexible coating for magnetic resonance imaging compatible … | Expired / Lapsed | 1992-08-14 | 1994-03-01 | 18 | Details |
| US5281916A | NMR angiography using fast spin echo pulse sequences | Expired / Lapsed | 1992-07-29 | 1994-01-25 | 7 | Details |
| US5235970A | Tracheal intubation with a stylet guide | Expired / Lapsed | 1992-06-23 | 1993-08-17 | 15 | Details |
| US5230340A | Ultrasound imaging system with improved dynamic focusing | Expired / Lapsed | 1992-04-13 | 1993-07-27 | 9 | Details |
| US5228443A | Method for estimation and display of current source distrib… | Expired / Lapsed | 1992-03-27 | 1993-07-20 | 4 | Details |
| US5226847A | Apparatus and method for acquiring imaging signals with red… | Expired / Lapsed | 1992-01-31 | 1993-07-13 | 30 | Details |
| US5221283A | Apparatus and method for stereotactic surgery | Expired / Lapsed | 1992-05-15 | 1993-06-22 | 19 | Details |
| US5211165A | Tracking system to follow the position and orientation of a… | Expired / Lapsed | 1991-09-03 | 1993-05-18 | 22 | Details |
| US5212448A | Nmr pulse sequence with burst rf excitation pulses having s… | Expired / Lapsed | 1991-08-09 | 1993-05-18 | 7 | Details |
| US5199948A | Needleless valve | Expired / Lapsed | 1991-05-02 | 1993-04-06 | 31 | Details |
| US5186177A | Method and apparatus for applying synthetic aperture focusi… | Expired / Lapsed | 1991-12-05 | 1993-02-16 | 16 | Details |
| US5143445A | Glass reflectors lpcvd coated with optical interference film | Expired / Lapsed | 1989-10-10 | 1992-09-01 | 37 | Details |
| US5142649A | Ultrasonic imaging system with multiple, dynamically focuse… | Expired / Lapsed | 1991-08-07 | 1992-08-25 | 14 | Details |
| US5132539A | Planar X-ray imager having a moisture-resistant sealing str… | Expired / Lapsed | 1991-08-29 | 1992-07-21 | 25 | Details |
| US5121364A | Time frequency control filter for an ultrasonic imaging sys… | Expired / Lapsed | 1991-08-07 | 1992-06-09 | 12 | Details |
| US5111695A | Dynamic phase focus for coherent imaging beam formation | Expired / Lapsed | 1990-07-11 | 1992-05-12 | 20 | Details |
| US5111292A | Priority selection apparatus as for a video signal processor | Expired / Lapsed | 1991-02-27 | 1992-05-05 | 16 | Details |
| US5099459A | Phased array ultrosonic transducer including different size… | Expired / Lapsed | 1990-04-05 | 1992-03-24 | 18 | Details |
| US5038784A | Multiple-echo angiography with enhanced signal-to-noise rat… | Expired / Lapsed | 1990-06-25 | 1991-08-13 | 10 | Details |
| US5022397A | Multiple-echo NMR angiography with multiple-velocity images | Expired / Lapsed | 1991-01-31 | 1991-06-11 | 4 | Details |
| US5017846A | Stall protection circuit for an electronically commutated m… | Expired / Lapsed | 1990-04-05 | 1991-05-21 | 32 | Details |
| US5014712A | Coded excitation for transmission dynamic focusing of vibra… | Expired / Lapsed | 1989-12-26 | 1991-05-14 | 22 | Details |
| US4995394A | Fast NMR cardiac profile imaging | Expired / Lapsed | 1989-08-11 | 1991-02-26 | 15 | Details |
| US4994965A | Method for reducing motion induced image artifacts in proje… | Expired / Lapsed | 1988-11-23 | 1991-02-19 | 13 | Details |
| US4983970A | Method and apparatus for digital phased array imaging | Expired / Lapsed | 1990-03-28 | 1991-01-08 | 23 | Details |
| US4966149A | Reducing the effects of coherence in magnetic resonance ima… | Expired / Lapsed | 1990-01-08 | 1990-10-30 | 9 | Details |
| US4947121A | Apparatus and method for enhanced multiple coil nuclear mag… | Expired / Lapsed | 1989-12-05 | 1990-08-07 | 3 | Details |
| US4937775A | Apparatus for the cross-correlation of a pair of complex sa… | Expired / Lapsed | 1988-11-21 | 1990-06-26 | 7 | Details |
| US4911170A | High frequency focused ultrasonic transducer for invasive t… | Expired / Lapsed | 1988-08-22 | 1990-03-27 | 13 | Details |
| US4879668A | Method of displaying internal surfaces of three-dimensional… | Expired / Lapsed | 1986-12-19 | 1989-11-07 | 11 | Details |
| US4873708A | Digital radiographic imaging system and method therefor | Expired / Lapsed | 1987-05-11 | 1989-10-10 | 33 | Details |
| US4871903A | Apparatus for rapidly accessing a large data base employing… | Expired / Lapsed | 1987-07-31 | 1989-10-03 | 23 | Details |
| US4871817A | Polyetherimide-liquid crystal polymer blends | Expired / Lapsed | 1986-12-31 | 1989-10-03 | 22 | Details |
| US4849697A | Three-dimensional magnetic resonance flow-contrast angiogra… | Expired / Lapsed | 1988-06-27 | 1989-07-18 | 28 | Details |
| US4839652A | Method and apparatus for high speed digital phased array co… | Expired / Lapsed | 1987-06-01 | 1989-06-13 | 18 | Details |
| US4835689A | Adaptive coherent energy beam formation using phase conjuga… | Expired / Lapsed | 1987-09-21 | 1989-05-30 | 22 | Details |
| US4833576A | Aluminum phosphate cement compositions and lamp assemblies … | Expired / Lapsed | 1987-09-29 | 1989-05-23 | 26 | Details |
| US4796236A | Architecture for ultrasonic imaging | Expired / Lapsed | 1986-12-29 | 1989-01-03 | 8 | Details |
| US4793679A | Optical coupling system | Expired / Lapsed | 1987-04-20 | 1988-12-27 | 13 | Details |
| US4760440A | Package for solid state image sensors | Expired / Lapsed | 1983-10-31 | 1988-07-26 | 8 | Details |
| US4757241A | PWM system for ECM motor | Expired / Lapsed | 1987-10-19 | 1988-07-12 | 18 | Details |
| US4751643A | Method and apparatus for determining connected substructure… | Expired / Lapsed | 1986-08-04 | 1988-06-14 | 40 | Details |
| US4742829A | Intracavitary ultrasound and biopsy probe for transvaginal … | Expired / Lapsed | 1986-08-11 | 1988-05-10 | 6 | Details |
| US4737716A | Self-shielded gradient coils for nuclear magnetic resonance… | Expired / Lapsed | 1986-02-06 | 1988-04-12 | 20 | Details |
| US4734582A | Integration time control for a radiation sensitive charge i… | Expired / Lapsed | 1986-12-04 | 1988-03-29 | 6 | Details |
| US4729098A | System and method employing nonlinear interpolation for the… | Expired / Lapsed | 1985-06-05 | 1988-03-01 | 20 | Details |
| US4721934A | Axial strap suspension system for a magnetic resonance magn… | Expired / Lapsed | 1987-04-02 | 1988-01-26 | 13 | Details |
| US4716297A | Method and apparatus for optically switching current | Expired / Lapsed | 1985-06-10 | 1987-12-29 | 20 | Details |
| US4710876A | System and method for the display of surface structures con… | Expired / Lapsed | 1985-06-05 | 1987-12-01 | 20 | Details |
| US4694255A | Radio frequency field coil for NMR | Expired / Lapsed | 1983-11-04 | 1987-09-15 | 61 | Details |
| US4687326A | Integrated range and luminance camera | Expired / Lapsed | 1985-11-12 | 1987-08-18 | 14 | Details |
| US4675424A | Method for making polysilazanes | Expired / Lapsed | 1986-03-19 | 1987-06-23 | 38 | Details |
| US4667480A | Method and apparatus for controlling an electrically driven… | Expired / Lapsed | 1986-09-22 | 1987-05-26 | 13 | Details |
| US4662380A | Adaptive time gain compensation system for ultrasound imagi… | Expired / Lapsed | 1985-10-31 | 1987-05-05 | 4 | Details |
| US4662223A | Method and means for steering phased array scanner in ultra… | Expired / Lapsed | 1985-10-31 | 1987-05-05 | 12 | Details |
| USRE32380E | Diamond tools for machining | Expired / Lapsed | 1981-11-10 | 1987-03-24 | 24 | Details |
| US4648028A | Color enhanced display for a numerical control system | Expired / Lapsed | 1984-08-31 | 1987-03-03 | 23 | Details |
| US4646045A | Aperture sized disc shaped end caps of a ferromagnetic shie… | Expired / Lapsed | 1985-03-25 | 1987-02-24 | 10 | Details |
| US4646046A | Shielded room construction for containment of fringe magnet… | Expired / Lapsed | 1984-11-21 | 1987-02-24 | 28 | Details |
| US4644276A | Three-dimensional nuclear magnetic resonance phantom | Expired / Lapsed | 1984-09-17 | 1987-02-17 | 18 | Details |
| US4642569A | Shield for decoupling RF and gradient coils in an NMR appar… | Expired / Lapsed | 1983-12-16 | 1987-02-10 | 8 | Details |
| US4641097A | Elliptical cross-section slotted-tube radio-frequency reson… | Expired / Lapsed | 1984-05-10 | 1987-02-03 | 22 | Details |
| US4638252A | Circuit for detecting RF coil assembly position in an MR sc… | Expired / Lapsed | 1984-12-21 | 1987-01-20 | 4 | Details |
| US4638253A | Mutual inductance NMR RF coil matching device | Expired / Lapsed | 1984-10-29 | 1987-01-20 | 9 | Details |
| US4636730A | NMR spectroscopy body probes with at least one surface coil | Expired / Lapsed | 1984-08-16 | 1987-01-13 | 26 | Details |
| US4629989A | Patient alignment system for NMR studies | Expired / Lapsed | 1983-11-10 | 1986-12-16 | 11 | Details |
| US4618924A | Automatic machining using constructive solid geometry with … | Expired / Lapsed | 1984-09-28 | 1986-10-21 | 18 | Details |
| US4610540A | Frequency burst analyzer | Expired / Lapsed | 1982-07-06 | 1986-09-09 | 13 | Details |
| US4609872A | NMR multiple-echo phase-contrast blood flow imaging | Expired / Lapsed | 1984-08-10 | 1986-09-02 | 22 | Details |
| US4583231A | Method of, and apparatus for, frequency-hopped frequency-sh… | Expired / Lapsed | 1983-11-02 | 1986-04-15 | 40 | Details |
| US4581582A | High-spatial-resolution spectroscopic NMR imaging of chemic… | Expired / Lapsed | 1983-12-27 | 1986-04-08 | 22 | Details |
| US4576045A | Wide aperture ultrasonic scanner employing convex transduce… | Expired / Lapsed | 1983-12-29 | 1986-03-18 | 3 | Details |
| US4574451A | Method for producing an article with a fluid passage | Expired / Lapsed | 1982-12-22 | 1986-03-11 | 13 | Details |
| US4574393A | Gray scale image processor | Expired / Lapsed | 1983-04-14 | 1986-03-04 | 10 | Details |
| US4569231A | Multiple frequency annular transducer array and system | Expired / Lapsed | 1984-07-09 | 1986-02-11 | 9 | Details |
| US4570173A | High-aspect-ratio hollow diffused regions in a semiconducto… | Expired / Lapsed | 1983-10-24 | 1986-02-11 | 7 | Details |
| US4567893A | Method of eliminating breathing artifacts in NMR imaging | Expired / Lapsed | 1984-11-21 | 1986-02-04 | 6 | Details |
| US4567894A | Hydraulically operated, mobile patient transport table usef… | Expired / Lapsed | 1984-11-09 | 1986-02-04 | 20 | Details |
| US4564736A | Industrial hand held laser tool and laser system | Expired / Lapsed | 1984-05-07 | 1986-01-14 | 11 | Details |
| US4557975A | Photocurable acrylate-acrylonitrile coated plastic articles | Expired / Lapsed | 1983-12-30 | 1985-12-10 | 14 | Details |
| US4556705A | Thermoplastic polyetherimide ester elastomers | Expired / Lapsed | 1984-10-26 | 1985-12-03 | 29 | Details |
| US4550608A | Oscillating scanner and drive mechanism therefor | Expired / Lapsed | 1983-12-29 | 1985-11-05 | 12 | Details |
| US4551647A | Temperature compensated piezoelectric transducer and lens a… | Expired / Lapsed | 1983-03-08 | 1985-11-05 | 36 | Details |
| US4546658A | Piezoelectric force/pressure sensor | Expired / Lapsed | 1984-02-24 | 1985-10-15 | 21 | Details |
| US4535297A | Binary signal demodulator with comparative value decision c… | Expired / Lapsed | 1984-01-09 | 1985-08-13 | 19 | Details |
| US4532473A | NMR method for measuring and imaging fluid flow | Expired / Lapsed | 1983-05-18 | 1985-07-30 | 34 | Details |
| US4532459A | Laundering apparatus, method of operating a laundry machine… | Expired / Lapsed | 1982-07-21 | 1985-07-30 | 106 | Details |
| US4530363A | Transducer array for sector scan and doppler flow measureme… | Expired / Lapsed | 1983-10-20 | 1985-07-23 | 2 | Details |
| US4528652A | Ultrasonic transducer and attenuating material for use ther… | Expired / Lapsed | 1981-12-30 | 1985-07-09 | 10 | Details |
| US4525858A | Method and apparatus for reconstruction of three-dimensiona… | Expired / Lapsed | 1983-01-03 | 1985-06-25 | 26 | Details |
| US4525628A | Rare earth ceramic scintillator | Expired / Lapsed | 1982-06-18 | 1985-06-25 | 10 | Details |
| US4522667A | Method for making multi-layer metal core circuit board lami… | Expired / Lapsed | 1982-11-22 | 1985-06-11 | 6 | Details |
| US4516582A | NMR blood flow imaging | Expired / Lapsed | 1983-05-02 | 1985-05-14 | 24 | Details |
| US4509030A | Correction coil assembly for NMR magnets | Expired / Lapsed | 1984-07-05 | 1985-04-02 | 14 | Details |
| US4475072A | Patient-positioning X-ray table | Expired / Lapsed | 1982-11-12 | 1984-10-02 | 14 | Details |
| US4475219A | Demodulator for frequency-shift-keyed binary data signals | Expired / Lapsed | 1982-08-18 | 1984-10-02 | 29 | Details |
| US4471132A | Method for making polyalkoxyaminosilanes | Expired / Lapsed | 1983-05-31 | 1984-09-11 | 5 | Details |
| US4470305A | Annular array used as a horn transducer | Expired / Lapsed | 1982-09-27 | 1984-09-11 | 14 | Details |
| US4470303A | Quantitative volume backscatter imaging | Expired / Lapsed | 1982-09-20 | 1984-09-11 | 16 | Details |
| US4469970A | Rotor for permanent magnet excited synchronous motor | Expired / Lapsed | 1981-12-24 | 1984-09-04 | 19 | Details |
| US4463592A | Method of determining operating characteristics of ultrason… | Expired / Lapsed | 1982-07-16 | 1984-08-07 | 9 | Details |
| US4463241A | Fixture for electrode wire EDM apparatus | Expired / Lapsed | 1982-06-28 | 1984-07-31 | 11 | Details |
| US4459519A | Electronically commutated motor systems and control therefor | Expired / Lapsed | 1980-09-25 | 1984-07-10 | 14 | Details |
| US4456020A | Adjustable hair curler | Expired / Lapsed | 1983-12-19 | 1984-06-26 | 8 | Details |
| US4453409A | Ultrasonic sector scanner utilizing rotating transducer | Expired / Lapsed | 1981-08-07 | 1984-06-12 | 5 | Details |
| US4452085A | Method and means for generating time gain compensation cont… | Expired / Lapsed | 1982-04-19 | 1984-06-05 | 2 | Details |
| US4449195A | Digital fluorographic processor control | Expired / Lapsed | 1981-11-13 | 1984-05-15 | 5 | Details |
| US4441503A | Collimation of ultrasonic linear array transducer | Expired / Lapsed | 1982-01-18 | 1984-04-10 | 7 | Details |
| US4442165A | Low-density thermally insulating carbon-carbon syntactic fo… | Expired / Lapsed | 1981-03-26 | 1984-04-10 | 3 | Details |
| US4438519A | Methods, and apparatus, for transmitting high-bit-rate digi… | Expired / Lapsed | 1981-05-04 | 1984-03-20 | 44 | Details |
| US4434546A | Method of making a core | Expired / Lapsed | 1981-09-22 | 1984-03-06 | 47 | Details |
| US4432031A | Method for overcurrent protection | Expired / Lapsed | 1982-05-03 | 1984-02-14 | 9 | Details |
| US4431007A | Referenced real-time ultrasonic image display | Expired / Lapsed | 1981-02-04 | 1984-02-14 | 4 | Details |
| US4425525A | Ultrasonic transducer array shading | Expired / Lapsed | 1982-02-16 | 1984-01-10 | 8 | Details |
| US4418938A | Vehicle strut suspension with camber adjustment | Expired / Lapsed | 1981-09-21 | 1983-12-06 | 6 | Details |
| US4417044A | Process for making polyetherimides | Expired / Lapsed | 1982-05-25 | 1983-11-22 | 19 | Details |
| US4414540A | Automatic redundant transducer selector for a steam turbine… | Expired / Lapsed | 1981-07-06 | 1983-11-08 | 14 | Details |
| US4409534A | Microcomputer-based pulse width modulated inverter fed mach… | Expired / Lapsed | 1981-12-07 | 1983-10-11 | 7 | Details |
| US4408228A | Method and means for reducing noise in television display s… | Expired / Lapsed | 1980-11-02 | 1983-10-04 | 2 | Details |
| US4402012A | Two-dimensional digital linear interpolation system | Expired / Lapsed | 1981-11-16 | 1983-08-30 | 13 | Details |
| US4400872A | Method of and apparatus for skewing a stack of laminations | Expired / Lapsed | 1981-08-13 | 1983-08-30 | 27 | Details |
| US4393402A | Subtraction fluoroscopy method and apparatus | Expired / Lapsed | 1981-06-08 | 1983-07-12 | 13 | Details |
| US4388831A | Ultrasonic probe for nondestructive inspection | Expired / Lapsed | 1981-02-20 | 1983-06-21 | 8 | Details |
| US4386528A | Method and means for generating pixel data in an ultrasonic… | Expired / Lapsed | 1981-08-07 | 1983-06-07 | 13 | Details |
| US4385397A | Parallax corrected external alignment lights | Expired / Lapsed | 1981-10-23 | 1983-05-24 | 10 | Details |
| US4382215A | System and method of precision machining | Expired / Lapsed | 1981-07-16 | 1983-05-03 | 16 | Details |
| US4382201A | Ultrasonic transducer and process to obtain high acoustic a… | Expired / Lapsed | 1981-04-27 | 1983-05-03 | 6 | Details |
| US4377736A | Method and apparatus for removing material from a surface | Expired / Lapsed | 1981-08-14 | 1983-03-22 | 10 | Details |
| US4377622A | Method for producing compacts and cladding from glassy meta… | Expired / Lapsed | 1980-08-25 | 1983-03-22 | 36 | Details |
| US4377870A | Electronic audience polling system | Expired / Lapsed | 1978-12-21 | 1983-03-22 | 34 | Details |
| US4371801A | Method and apparatus for output regulation of multiple disk… | Expired / Lapsed | 1981-01-12 | 1983-02-01 | 18 | Details |
| US4367490A | Noise reduction in digital fluoroscopy systems | Expired / Lapsed | 1981-04-24 | 1983-01-04 | 12 | Details |
| US4366406A | Ultrasonic transducer for single frequency applications | Expired / Lapsed | 1981-03-30 | 1982-12-28 | 8 | Details |
| US4363981A | Means to reduce frictional heating of a superconducting win… | Expired / Lapsed | 1981-05-01 | 1982-12-14 | 18 | Details |
| US4361901A | Multiple voltage x-ray switching system | Expired / Lapsed | 1980-11-18 | 1982-11-30 | 17 | Details |
| US4361043A | Reference voltage generation means for controlling a display | Expired / Lapsed | 1980-11-03 | 1982-11-30 | 11 | Details |
| US4359908A | Electrical bushing gas sampling apparatus and method | Expired / Lapsed | 1980-12-29 | 1982-11-23 | 13 | Details |
| US4356731A | Method and means for generating time gain compensation cont… | Expired / Lapsed | 1980-11-03 | 1982-11-02 | 13 | Details |
| US4355331A | X-ray image subtracting system | Expired / Lapsed | 1981-01-28 | 1982-10-19 | 44 | Details |
| US4349274A | Optical triangulation apparatus and method | Expired / Lapsed | 1980-07-23 | 1982-09-14 | 10 | Details |
| USD264335S | Ornamental design for a microphone | Expired / Lapsed | 1980-03-06 | 1982-05-11 | 1 | Details |
| USD263143S | Paging radio receiver | Expired / Lapsed | 1979-10-05 | 1982-02-23 | 1 | Details |
| US4307343A | Moving gradient zeugmatography | Expired / Lapsed | 1979-08-20 | 1981-12-22 | 14 | Details |
| US4306148A | Tactile sensor | Expired / Lapsed | 1980-01-21 | 1981-12-15 | 10 | Details |
| US4304523A | Means and method for securing a member to a structure | Expired / Lapsed | 1980-06-23 | 1981-12-08 | 13 | Details |
| US4300550A | Suction and oxygenation catheter | Expired / Lapsed | 1980-03-07 | 1981-11-17 | 7 | Details |
| US4290052A | Capacitive touch entry apparatus having high degree of pers… | Expired / Lapsed | 1979-10-26 | 1981-09-15 | 9 | Details |
| US4290141A | Electronic voting system | Expired / Lapsed | 1979-07-02 | 1981-09-15 | 23 | Details |
| US4281276A | Dual mode AC motor drive system | Expired / Lapsed | 1979-04-24 | 1981-07-28 | 20 | Details |
| US4280580A | Proximity detector system for a medical diagnostic device | Expired / Lapsed | 1978-11-03 | 1981-07-28 | 14 | Details |
| US4277832A | Fluid flow control system | Expired / Lapsed | 1979-10-01 | 1981-07-07 | 24 | Details |
| USD259564S | Portable radio transmitter and receiver housing | Expired / Lapsed | 1978-08-28 | 1981-06-16 | 1 | Details |
| US4265126A | Measurement of true blood velocity by an ultrasound system | Expired / Lapsed | 1979-06-15 | 1981-05-05 | 22 | Details |
| US4262204A | Patient cradle for computerized tomography apparatus | Expired / Lapsed | 1979-09-24 | 1981-04-14 | 3 | Details |
| US4259725A | Cursor generator for use in computerized tomography and oth… | Expired / Lapsed | 1979-03-01 | 1981-03-31 | 18 | Details |
| US4257278A | Quantitative volume blood flow measurement by an ultrasound… | Expired / Lapsed | 1979-08-24 | 1981-03-24 | 7 | Details |
| US4258428A | Compton effect deemphasizer for gamma cameras | Expired / Lapsed | 1979-06-25 | 1981-03-24 | 10 | Details |
| US4256983A | Voltage-to-frequency converter having a constant frequency … | Expired / Lapsed | 1979-05-02 | 1981-03-17 | 7 | Details |
| US4248369A | Laser cutting of ceramic tubing | Expired / Lapsed | 1979-08-02 | 1981-02-03 | 7 | Details |
| US4245244A | Device for delineating zones in a video image display | Expired / Lapsed | 1978-09-01 | 1981-01-13 | 3 | Details |
| US4245168A | Integratable driver for liquid crystal displays and the like | Expired / Lapsed | 1978-08-03 | 1981-01-13 | 8 | Details |
| US4237559A | Bone implant embodying a composite high and low density fir… | Expired / Lapsed | 1979-05-11 | 1980-12-09 | 6 | Details |
| US4237265A | Process for catalyst removal from polyphenylene ether react… | Expired / Lapsed | 1975-09-08 | 1980-12-02 | 13 | Details |
| US4227942A | Photovoltaic semiconductor devices and methods of making sa… | Expired / Lapsed | 1979-04-23 | 1980-10-14 | 22 | Details |
| US4227083A | Apparatus for infrared laser spectroscopy of room temperatu… | Expired / Lapsed | 1979-02-02 | 1980-10-07 | 21 | Details |
| USD257035S | Two prong electric plug | Expired / Lapsed | 1978-12-26 | 1980-09-23 | 1 | Details |
| US4219221A | Coupling for rejoining sealed tubing | Expired / Lapsed | 1979-02-26 | 1980-08-26 | 12 | Details |
| US4217684A | Fabrication of front surface matched ultrasonic transducer … | Expired / Lapsed | 1979-04-16 | 1980-08-19 | 14 | Details |
| US4217909A | Directional detection of blood velocities in an ultrasound … | Expired / Lapsed | 1978-08-23 | 1980-08-19 | 10 | Details |
| US4212305A | Disposable forceps | Expired / Lapsed | 1978-03-02 | 1980-07-15 | 3 | Details |
| US4211948A | Front surface matched piezoelectric ultrasonic transducer a… | Expired / Lapsed | 1978-11-08 | 1980-07-08 | 9 | Details |
| US4211949A | Wear plate for piezoelectric ultrasonic transducer arrays | Expired / Lapsed | 1978-11-08 | 1980-07-08 | 3 | Details |
| US4212057A | Shared memory multi-microprocessor computer system | Expired / Lapsed | 1976-04-22 | 1980-07-08 | 11 | Details |
| US4204195A | Meter terminal unit for use in automatic remote meter readi… | Expired / Lapsed | 1978-04-24 | 1980-05-20 | 4 | Details |
| US4201837A | Bonded amorphous metal electromagnetic components | Expired / Lapsed | 1978-11-16 | 1980-05-06 | 6 | Details |
| US4199204A | Housing for a two-way radio or the like | Expired / Lapsed | 1978-12-18 | 1980-04-22 | 6 | Details |
| US4198465A | Photocurable acrylic coated polycarbonate articles | Expired / Lapsed | 1978-11-01 | 1980-04-15 | 35 | Details |
| US4197146A | Molded amorphous metal electrical magnetic components | Expired / Lapsed | 1978-10-24 | 1980-04-08 | 12 | Details |
| US4194400A | Ultrasonic inspection method | Expired / Lapsed | 1977-12-21 | 1980-03-25 | 4 | Details |
| US4182173A | Duplex ultrasonic imaging system with repetitive excitation… | Expired / Lapsed | 1978-08-23 | 1980-01-08 | 18 | Details |
| US4182787A | Optically transparent, radiographically opaque tubing | Expired / Lapsed | 1978-06-19 | 1980-01-08 | 17 | Details |
| US4181512A | Bacteria filters with transparent housings | Expired / Lapsed | 1978-05-19 | 1980-01-01 | 2 | Details |
| US4181505A | Method for the work-hardening of diamonds and product there… | Expired / Lapsed | 1978-04-17 | 1980-01-01 | 13 | Details |
| US4180791A | Simplified sector scan ultrasonic imaging system | Expired / Lapsed | 1978-03-09 | 1979-12-25 | 14 | Details |
| US4180790A | Dynamic array aperture and focus control for ultrasonic ima… | Expired / Lapsed | 1977-12-27 | 1979-12-25 | 9 | Details |
| US4180612A | Hydantoin-polyester coating compositions | Expired / Lapsed | 1975-01-13 | 1979-12-25 | 18 | Details |
| US4175159A | Silicone emulsions for treating silicate particulate matter | Expired / Lapsed | 1978-07-31 | 1979-11-20 | 26 | Details |
| US4173754A | Distributed control system | Expired / Lapsed | 1977-06-24 | 1979-11-06 | 11 | Details |
| US4171930A | U-clip for boltless blade retainer | Expired / Lapsed | 1977-12-28 | 1979-10-23 | 16 | Details |
| US4169990A | Electronically commutated motor | Expired / Lapsed | 1977-06-01 | 1979-10-02 | 58 | Details |
| US4168582A | Radar terrain signal simulator | Expired / Lapsed | 1976-01-26 | 1979-09-25 | 4 | Details |
| US4167786A | Load control processor | Expired / Lapsed | 1978-01-24 | 1979-09-11 | 12 | Details |
| US4159462A | Ultrasonic multi-sector scanner | Expired / Lapsed | 1977-08-18 | 1979-06-26 | 20 | Details |
| US4155259A | Ultrasonic imaging system | Expired / Lapsed | 1978-05-24 | 1979-05-22 | 12 | Details |
| US4155258A | Ultrasonic imaging system | Expired / Lapsed | 1978-05-24 | 1979-05-22 | 11 | Details |
| US4155260A | Ultrasonic imaging system | Expired / Lapsed | 1978-05-24 | 1979-05-22 | 10 | Details |
| US4156194A | Frequency-shift-keyed receiver | Expired / Lapsed | 1977-09-06 | 1979-05-22 | 16 | Details |
| US4154113A | Ultrasonic imaging system | Expired / Lapsed | 1978-05-24 | 1979-05-15 | 6 | Details |
| US4153141A | Auxiliary oil supply system | Expired / Lapsed | 1977-06-20 | 1979-05-08 | 11 | Details |
| US4150364A | Parallel access memory system | Expired / Lapsed | 1977-06-29 | 1979-04-17 | 5 | Details |
| US4140572A | Process for selective etching of polymeric materials embody… | Expired / Lapsed | 1976-09-07 | 1979-02-20 | 24 | Details |
| US4139822A | Eddy current probe for inspecting interiors of gas turbines… | Expired / Lapsed | 1977-06-14 | 1979-02-13 | 6 | Details |
| US4138105A | Respiratory exerciser | Expired / Lapsed | 1977-02-28 | 1979-02-06 | 12 | Details |
| US4136102A | Photoinitiators | Expired / Lapsed | 1977-04-21 | 1979-01-23 | 11 | Details |
| US4133656A | Bacteria filters with transparent housings | Expired / Lapsed | 1977-02-02 | 1979-01-09 | 2 | Details |
| US4132947A | Waveshape detector | Expired / Lapsed | 1967-09-06 | 1979-01-02 | 13 | Details |
| US4127034A | Digital rectilinear ultrasonic imaging system | Expired / Lapsed | 1977-12-23 | 1978-11-28 | 29 | Details |
| US4126592A | Process for the preparation of polyesters having stabilized… | Expired / Lapsed | 1976-12-16 | 1978-11-21 | 14 | Details |
| US4124862A | Charge transfer filter | Expired / Lapsed | 1977-03-08 | 1978-11-07 | 5 | Details |
| US4121468A | Method and apparatus for reflective ultrasonic imaging util… | Expired / Lapsed | 1977-06-23 | 1978-10-24 | 18 | Details |
| US4117337A | Patient positioning indication arrangement for a computed t… | Expired / Lapsed | 1977-11-03 | 1978-09-26 | 12 | Details |
| US4115535A | Diagnostic method employing a mixture of normally separable… | Expired / Lapsed | 1977-06-22 | 1978-09-19 | 20 | Details |
| US4115696A | Computed tomography scanner | Expired / Lapsed | 1977-04-18 | 1978-09-19 | 5 | Details |
| US4115333A | Warp-resistant reinforced thermoplastic compositions compri… | Expired / Lapsed | 1977-03-18 | 1978-09-19 | 17 | Details |
| US4110632A | Device, method and system for controlling the supply of pow… | Expired / Lapsed | 1977-01-28 | 1978-08-29 | 33 | Details |
| US4106341A | Linearized thermistor temperature measuring circuit | Expired / Lapsed | 1977-01-03 | 1978-08-15 | 14 | Details |
| US4100883A | Apparatus for electrostatic deposition on a running conduct… | Expired / Lapsed | 1976-10-18 | 1978-07-18 | 7 | Details |
| US4099075A | Signal detection apparatus using an adaptive threshold | Expired / Lapsed | 1977-03-23 | 1978-07-04 | 9 | Details |
| US4099039A | Means for effectively controlling the forces imposed on the… | Expired / Lapsed | 1976-12-20 | 1978-07-04 | 26 | Details |
| US4093997A | Portable programmer for time-of-day metering register syste… | Expired / Lapsed | 1976-09-17 | 1978-06-06 | 18 | Details |
| US4090116A | Closed loop digital control system and method for motor con… | Expired / Lapsed | 1976-12-10 | 1978-05-16 | 22 | Details |
| US4087199A | Ceramic turbine shroud assembly | Expired / Lapsed | 1976-11-22 | 1978-05-02 | 15 | Details |
| US4085327A | Direct charge readout electron radiography apparatus with i… | Expired / Lapsed | 1977-01-14 | 1978-04-18 | 41 | Details |
| US4085084A | Silicone resins having good thermal stability | Expired / Lapsed | 1976-08-26 | 1978-04-18 | 19 | Details |
| US4081215A | Stable two-channel, single-filter spectrometer | Expired / Lapsed | 1976-05-18 | 1978-03-28 | 23 | Details |
| US4079417A | Digital video window control | Expired / Lapsed | 1976-07-06 | 1978-03-14 | 13 | Details |
| US4075883A | Ultrasonic fan beam scanner for computerized time-of-flight… | Expired / Lapsed | 1976-08-20 | 1978-02-28 | 16 | Details |
| US4075038A | Deep diode devices and method and apparatus | Expired / Lapsed | 1975-02-24 | 1978-02-21 | 7 | Details |
| US4073056A | Vegetable peeler | Expired / Lapsed | 1977-04-11 | 1978-02-14 | 5 | Details |
| US4070845A | Multi-purpose concrete formwork structural member with nove… | Expired / Lapsed | 1976-06-21 | 1978-01-31 | 6 | Details |
| US4063913A | Bacteria filters with transparent housings | Expired / Lapsed | 1976-03-23 | 1977-12-20 | 4 | Details |
| US4063228A | Moisture detector for steam line | Expired / Lapsed | 1976-12-22 | 1977-12-13 | 13 | Details |
| US4058401A | Photocurable compositions containing group via aromatic oni… | Expired / Lapsed | 1975-12-09 | 1977-11-15 | 16 | Details |
| US4055786A | Control system for time sharing multiple stepper motors wit… | Expired / Lapsed | 1976-05-06 | 1977-10-25 | 14 | Details |
| US4054835A | Rapid response generating voltmeter | Expired / Lapsed | 1976-11-22 | 1977-10-18 | 16 | Details |
| US4052623A | Isolated semiconductor gate control circuit | Expired / Lapsed | 1976-08-10 | 1977-10-04 | 7 | Details |
| US4046341A | Aircraft angle-of-attack and sideslip estimator | Expired / Lapsed | 1976-03-30 | 1977-09-06 | 6 | Details |
| US4046223A | Bearing sump cooling arrangement | Expired / Lapsed | 1975-10-15 | 1977-09-06 | 5 | Details |
| US4041300A | Photoflash array with discharge path for electrostatic char… | Expired / Lapsed | 1975-10-28 | 1977-08-09 | 10 | Details |
| US4039889A | Blue-white glow lamp | Expired / Lapsed | 1976-02-25 | 1977-08-02 | 7 | Details |
| US4035621A | Excavator data logging system | Expired / Lapsed | 1975-07-14 | 1977-07-12 | 6 | Details |
| US4030119A | Video window control | Expired / Lapsed | 1975-10-01 | 1977-06-14 | 16 | Details |
| US4025070A | Respiratory exerciser | Expired / Lapsed | 1976-04-19 | 1977-05-24 | 12 | Details |
| US4024294A | Protective coatings for superalloys | Expired / Lapsed | 1975-03-10 | 1977-05-17 | 19 | Details |
| US4021659A | Projector lamp reflector | Expired / Lapsed | 1975-10-30 | 1977-05-03 | 4 | Details |
| US4020358A | Device system and method for controlling the supply of powe… | Expired / Lapsed | 1975-12-16 | 1977-04-26 | 47 | Details |
| US4020122A | Process for the preparation of polyester compositions havin… | Expired / Lapsed | 1973-01-05 | 1977-04-26 | 9 | Details |
| US4018564A | Silicone composition for analyzing blood samples | Expired / Lapsed | 1975-11-24 | 1977-04-19 | 16 | Details |
| US4017985A | Multisensor digital image generator | Expired / Lapsed | 1975-08-22 | 1977-04-19 | 6 | Details |
| US4016494A | Satellite communication system with improved conference fac… | Expired / Lapsed | 1975-11-11 | 1977-04-05 | 3 | Details |
| US4015093A | Photoflash array having electrical shorting means | Expired / Lapsed | 1975-01-02 | 1977-03-29 | 7 | Details |
| US4011044A | Use of laser speckle patterns for measurement of electropho… | Expired / Lapsed | 1976-07-06 | 1977-03-08 | 8 | Details |
| US4011442A | Apparatus for sensing optical signals | Expired / Lapsed | 1975-12-22 | 1977-03-08 | 14 | Details |
| US4011441A | Solid state imaging apparatus | Expired / Lapsed | 1975-12-22 | 1977-03-08 | 6 | Details |
| US4011017A | Borescope support apparatus | Expired / Lapsed | 1975-07-16 | 1977-03-08 | 6 | Details |
| US4005377A | Conductivity coupled split capacitor signal processing devi… | Expired / Lapsed | 1975-09-02 | 1977-01-25 | 9 | Details |
| US4002827A | Polar coordinate format to a cartesian coordinate format sc… | Expired / Lapsed | 1975-05-15 | 1977-01-11 | 6 | Details |
| US3996091A | Method and apparatus for heat bonding | Expired / Lapsed | 1974-09-11 | 1976-12-07 | 4 | Details |
| US3988679A | Wideband receiving system including multi-channel filter fo… | Expired / Lapsed | 1975-02-24 | 1976-10-26 | 4 | Details |
| US3984533A | Electrophoretic method of detecting antigen-antibody reacti… | Expired / Lapsed | 1975-11-13 | 1976-10-05 | 9 | Details |
| US3983379A | Random sample statistical function analyzer | Expired / Lapsed | 1975-02-18 | 1976-09-28 | 14 | Details |
| US3978713A | Laser generation of ultrasonic waves for nondestructive tes… | Expired / Lapsed | 1975-05-27 | 1976-09-07 | 10 | Details |
| US3979184A | Diagnostic device for visually detecting presence of biolog… | Expired / Lapsed | 1975-05-27 | 1976-09-07 | 16 | Details |
| US3975720A | Food thermometer for microwave oven | Expired / Lapsed | 1975-09-23 | 1976-08-17 | 15 | Details |
| US3972951A | Process for the formation of 2,6-diphenyl-phenol | Expired / Lapsed | 1971-03-08 | 1976-08-03 | 7 | Details |
| US3970518A | Magnetic separation of biological particles | Expired / Lapsed | 1975-07-01 | 1976-07-20 | 9 | Details |
| US3969137A | Conduit for transmitting washing liquid to an upper spray a… | Expired / Lapsed | 1975-06-25 | 1976-07-13 | 3 | Details |
| US3964014A | Sonic transducer array | Expired / Lapsed | 1974-10-15 | 1976-06-15 | 11 | Details |
| US3962685A | Data processing system having pyramidal hierarchy control f… | Expired / Lapsed | 1974-06-03 | 1976-06-08 | 37 | Details |
| US3960489A | Method and apparatus for determination of concentration of … | Expired / Lapsed | 1974-04-01 | 1976-06-01 | 39 | Details |
| US3959767A | Data transmission system | Expired / Lapsed | 1974-08-21 | 1976-05-25 | 14 | Details |
| US3957704A | Cross-linking agents for room temperature vulcanizable sili… | Expired / Lapsed | 1974-12-19 | 1976-05-18 | 25 | Details |
| US3957033A | Ventilation study system | Expired / Lapsed | 1973-08-15 | 1976-05-18 | 14 | Details |
| US3950677A | Housing mounting arrangement for ground fault circuit inter… | Expired / Lapsed | 1974-10-30 | 1976-04-13 | 8 | Details |
| US3945387A | Implantable cardiac pacer with characteristic controllable … | Expired / Lapsed | 1974-09-09 | 1976-03-23 | 19 | Details |
| US3944957A | Flux-transfer trip device for a circuit breaker | Expired / Lapsed | 1974-12-23 | 1976-03-16 | 8 | Details |
| US3944723A | Station for power line access data system | Expired / Lapsed | 1974-12-05 | 1976-03-16 | 14 | Details |
| US3943013A | Triac with gold diffused boundary | Expired / Lapsed | 1973-10-11 | 1976-03-09 | 12 | Details |
| US3939307A | Arrangement for utilizing all pulses in a narrow band chann… | Expired / Lapsed | 1974-08-12 | 1976-02-17 | 10 | Details |
| US3934460A | Apparatus for focusing and collimating ultrasonic waves | Expired / Lapsed | 1973-08-06 | 1976-01-27 | 26 | Details |
| US3930193A | SCR inverter systems | Expired / Lapsed | 1973-08-02 | 1975-12-30 | 16 | Details |
| US3925277A | Process for packaging and mixing a two-part room temperatur… | Expired / Lapsed | 1974-05-06 | 1975-12-09 | 2 | Details |
| US3923056A | Compliance compensation for electronically controlled volum… | Expired / Lapsed | 1974-06-19 | 1975-12-02 | 4 | Details |
| US3922705A | Dielectrically isolated integral silicon diaphram or other … | Expired / Lapsed | 1974-11-27 | 1975-11-25 | 2 | Details |
| US3922493A | Communication system using time-division multiplexing and p… | Expired / Lapsed | 1971-02-01 | 1975-11-25 | 25 | Details |
| US3921005A | Emergency lighting system with high efficiency inverter | Expired / Lapsed | 1974-12-19 | 1975-11-18 | 28 | Details |
| US3921146A | Programmable data processor and controller system | Expired / Lapsed | 1974-06-17 | 1975-11-18 | 28 | Details |
| US3920951A | Laser etching apparatus for forming photographic images on … | Expired / Lapsed | 1974-06-03 | 1975-11-18 | 8 | Details |
| US3918269A | Temperature and air flow controlling apparatus of a househo… | Expired / Lapsed | 1974-10-16 | 1975-11-11 | 4 | Details |
| US3919344A | Silanol-free resins | Expired / Lapsed | 1974-05-02 | 1975-11-11 | 4 | Details |
| US3919638A | Microwave detection instrument | Expired / Lapsed | 1973-08-10 | 1975-11-11 | 11 | Details |
| US3917432A | Borescope support apparatus | Expired / Lapsed | 1974-11-13 | 1975-11-04 | 4 | Details |
| US3916268A | Device for storing information and providing an electric re… | Expired / Lapsed | 1973-10-01 | 1975-10-28 | 18 | Details |
| US3913348A | Refrigerant system connecting apparatus | Expired / Lapsed | 1974-07-22 | 1975-10-21 | 4 | Details |
| US3908130A | Starter-generator utilizing phase controlled rectifiers to … | Expired / Lapsed | 1974-08-30 | 1975-09-23 | 9 | Details |
| US3907504A | Blood oxygenation system including automatic means for stab… | Expired / Lapsed | 1973-04-06 | 1975-09-23 | 8 | Details |
| US3906120A | Method for preparing slides for blood evaluation | Expired / Lapsed | 1973-05-24 | 1975-09-16 | 15 | Details |
| US3904367A | Contrast enhancement for immunological film detection | Expired / Lapsed | 1973-08-15 | 1975-09-09 | 4 | Details |
| US3903884A | Manifold nebulizer system | Expired / Lapsed | 1973-08-15 | 1975-09-09 | 8 | Details |
| US3902803A | High pulse repetition frequency electro-optical viewing sys… | Expired / Lapsed | 1973-06-25 | 1975-09-02 | 11 | Details |
| US3901736A | Method of making deep diode devices | Expired / Lapsed | 1973-10-30 | 1975-08-26 | 10 | Details |
| US3899776A | Programmable terminal | Expired / Lapsed | 1974-02-28 | 1975-08-12 | 14 | Details |
| US3897376A | Room temperature vulcanizable silicone rubber composition | Expired / Lapsed | 1972-03-17 | 1975-07-29 | 9 | Details |
| US3886104A | Stabilized polyester compositions | Expired / Lapsed | 1973-01-05 | 1975-05-27 | 26 | Details |
| US3884866A | High strength organopolysiloxane compositions | Expired / Lapsed | 1973-04-13 | 1975-05-20 | 8 | Details |
| US3883834A | Ballast transformer with heat dissipating device | Expired / Lapsed | 1973-12-13 | 1975-05-13 | 10 | Details |
| US3883786A | Pulse width modulated servo system | Expired / Lapsed | 1973-10-12 | 1975-05-13 | 24 | Details |
| US3882083A | Latent addition curable organopolysiloxane compositions | Expired / Lapsed | 1973-11-21 | 1975-05-06 | 16 | Details |
| US3882498A | Adaptive array processor providing improved mainlobe mainte… | Expired / Lapsed | 1973-02-22 | 1975-05-06 | 2 | Details |
| US3879988A | Optical comparator for measuring vibration on a rotating ob… | Expired / Lapsed | 1973-12-19 | 1975-04-29 | 9 | Details |
| US3875254A | Block copolymers of silicones with vinyl pyridine | Expired / Lapsed | 1971-12-29 | 1975-04-01 | 9 | Details |
| US3867681A | Battery charging circuit | Expired / Lapsed | 1974-03-20 | 1975-02-18 | 6 | Details |
| US3865766A | Process for bodying organopolysiloxanes | Expired / Lapsed | 1973-12-14 | 1975-02-11 | 48 | Details |
| US3865785A | Polyesteramideimides | Expired / Lapsed | 1972-12-27 | 1975-02-11 | 4 | Details |
| US3863224A | Selectively controllable shift register and counter divider… | Expired / Lapsed | 1973-01-30 | 1975-01-28 | 14 | Details |
| US3859997A | Reservoir bag for anesthesiology | Expired / Lapsed | 1973-07-09 | 1975-01-14 | 3 | Details |
| US3859622A | Electronic scanning switch for sonar | Expired / Lapsed | 1973-01-15 | 1975-01-07 | 7 | Details |
| US3856582A | Fabrication of matrix bonded transition metal-rare earth al… | Expired / Lapsed | 1973-06-22 | 1974-12-24 | 5 | Details |
| US3854916A | System using motor driven control device | Expired / Lapsed | 1973-06-29 | 1974-12-17 | 5 | Details |
| US3853467A | Method and apparatus for immunological detection of biologi… | Expired / Lapsed | 1973-08-15 | 1974-12-10 | 21 | Details |
| US3853817A | Tin containing esterimide polymer resins and method of form… | Expired / Lapsed | 1973-06-08 | 1974-12-10 | 13 | Details |
| US3853496A | Method of making a metal insulator silicon field effect tra… | Expired / Lapsed | 1973-01-02 | 1974-12-10 | 7 | Details |
| US3851607A | Regenerator support system for marine gas turbine | Expired / Lapsed | 1973-03-29 | 1974-12-03 | 2 | Details |
| US3850501A | Feedthrough electrical terminal for hollow liquid cooled sh… | Expired / Lapsed | 1973-04-09 | 1974-11-26 | 5 | Details |
| US3848608A | Subject integument spatial stimulator | Expired / Lapsed | 1973-07-23 | 1974-11-19 | 7 | Details |
| US3844110A | Gas turbine engine internal lubricant sump venting and pres… | Expired / Lapsed | 1973-02-26 | 1974-10-29 | 12 | Details |
| US3842350A | Combined land line and satellite communication switching sy… | Expired / Lapsed | 1972-12-26 | 1974-10-15 | 37 | Details |
| US3837819A | Zinc diffused copper | Expired / Lapsed | 1972-06-19 | 1974-09-24 | 0 | Details |
| US3833685A | Flame retardant thermoplastic compositions | Expired / Lapsed | 1972-03-10 | 1974-09-03 | 0 | Details |
| US3821630A | Commutation failure detection and control for scr inverters | Expired / Lapsed | 1973-08-02 | 1974-06-28 | 11 | Details |
| US3821686A | Protective connector devices | Expired / Lapsed | 1971-10-21 | 1974-06-28 | 12 | Details |
| US3821218A | Nitrogen-containing organosilicon materials | Expired / Lapsed | 1970-12-08 | 1974-06-28 | 2 | Details |
| US3819954A | Signal level shift compensation in chargetransfer delay lin… | Expired / Lapsed | 1973-02-01 | 1974-06-25 | 28 | Details |
| US3819953A | Differential bucket-brigade circuit | Expired / Lapsed | 1972-11-22 | 1974-06-25 | 17 | Details |
| US3816704A | Surface heating apparatus | Expired / Lapsed | 1972-03-20 | 1974-06-11 | 9 | Details |
| US3815015A | Transformer-diode isolated circuits for high voltage power … | Expired / Lapsed | 1973-02-20 | 1974-06-04 | 9 | Details |
| US3814539A | Rotor sealing arrangement for an axial flow fluid turbine | Expired / Lapsed | 1972-10-04 | 1974-06-04 | 13 | Details |
| US3814730A | Platinum complexes of unsaturated siloxanes and platinum co… | Expired / Lapsed | 1972-02-16 | 1974-06-04 | 0 | Details |
| US3810814A | Asymmetric polymer membranes of reduced elastic modulus | Expired / Lapsed | 1972-12-18 | 1974-05-14 | 0 | Details |
| US3806771A | Smoothly beveled semiconductor device with thick glass pass… | Expired / Lapsed | 1971-01-15 | 1974-04-23 | 2 | Details |
| US3793531A | Electronic tree light controller | Expired / Lapsed | 1971-12-09 | 1974-02-19 | 7 | Details |
| US3793060A | Metallized ultrafine porous polymer articles | Expired / Lapsed | 1971-06-03 | 1974-02-19 | 8 | Details |
| US3790778A | Dynamic biasing arrangement for speed regulation | Expired / Lapsed | 1972-12-13 | 1974-02-05 | 8 | Details |
| US3789268A | Miniature circuit breaker with electronic tripping means | Expired / Lapsed | 1972-12-29 | 1974-01-29 | 16 | Details |
| US3787852A | Bucket brigate delay line time multiplexed mti circuit for … | Expired / Lapsed | 1972-04-03 | 1974-01-22 | 11 | Details |
| US3787382A | Photopolymerization of tetrafluoro-ethylene and polymer and… | Expired / Lapsed | 1972-02-16 | 1974-01-22 | 0 | Details |
| US3786220A | Induction cooking appliance including temperature sensing o… | Expired / Lapsed | 1971-12-29 | 1974-01-15 | 4 | Details |
| US3786015A | Method for preparing fast curing silanol-containing organop… | Expired / Lapsed | 1971-12-22 | 1974-01-15 | 0 | Details |
| US3784847A | Dielectric strip isolation for jfet or mesfet depletion-mod… | Expired / Lapsed | 1972-10-10 | 1974-01-08 | 22 | Details |
| US3781235A | Method for making rigid foam and compositions using such me… | Expired / Lapsed | 1972-10-31 | 1973-12-25 | 0 | Details |
| US3780572A | Ultrasonic inspection apparatus | Expired / Lapsed | 1972-09-18 | 1973-12-25 | 18 | Details |
| US3781831A | Read only memory utilizing floating gate transistors and me… | Expired / Lapsed | 1972-06-30 | 1973-12-25 | 10 | Details |
| US3781378A | High temperature membrane materials | Expired / Lapsed | 1971-11-24 | 1973-12-25 | 0 | Details |
| US3779987A | Process for producing diorganopolysiloxane polymers | Expired / Lapsed | 1972-10-12 | 1973-12-18 | 0 | Details |
| US3779345A | Emergency lubrication supply system | Expired / Lapsed | 1972-05-22 | 1973-12-18 | 14 | Details |
| US3778170A | Borescope guide tube | Expired / Lapsed | 1972-11-02 | 1973-12-11 | 12 | Details |
| US3778757A | Method and apparatus for visual imaging ultrasonic echo sig… | Expired / Lapsed | 1972-09-01 | 1973-12-11 | 42 | Details |
| US3778798A | Food preparation electric thermometer alarm circuit | Expired / Lapsed | 1972-05-01 | 1973-12-11 | 12 | Details |
| US3775452A | Platinum complexes of unsaturated siloxanes and platinum co… | Expired / Lapsed | 1971-04-28 | 1973-11-27 | 0 | Details |
| US3773718A | Method for making imido-substituted aromatic polymers | Expired / Lapsed | 1971-04-30 | 1973-11-20 | 0 | Details |
| US3770532A | Porous bodies and method of making | Expired / Lapsed | 1971-02-16 | 1973-11-06 | 6 | Details |
| US3769442A | Compressed data base for radar land mass simulator | Expired / Lapsed | 1972-08-03 | 1973-10-30 | 5 | Details |
| US3769475A | Pneumatic break detector sensor | Expired / Lapsed | 1971-10-21 | 1973-10-30 | 7 | Details |
| US3766973A | Control circuit for heating and cooling apparatus | Expired / Lapsed | 1972-03-15 | 1973-10-23 | 8 | Details |
| US3768014A | Cardiac pacemaker rate/interval computer system | Expired / Lapsed | 1972-01-28 | 1973-10-23 | 8 | Details |
| US3767308A | Method and apparatus for sensing surface displacement ortho… | Expired / Lapsed | 1972-01-12 | 1973-10-23 | 12 | Details |
| US3766439A | Electronic module using flexible printed circuit board with… | Expired / Lapsed | 1972-01-12 | 1973-10-16 | 6 | Details |
| US3766302A | Novel bis imide compositions and polymers therefrom | Expired / Lapsed | 1971-06-03 | 1973-10-16 | 0 | Details |
| US3764280A | Electroconductive coatings on non conductive substrates | Expired / Lapsed | 1970-11-02 | 1973-10-09 | 0 | Details |
| US3764479A | Disk flotation determination of catalase activity | Expired / Lapsed | 1970-09-28 | 1973-10-09 | 0 | Details |
| US3763081A | Curable aliphatically unsaturated siloxane and imide blends | Expired / Lapsed | 1972-01-17 | 1973-10-02 | 0 | Details |
| US3763271A | Method for introducing imido alkylene substitution into aro… | Expired / Lapsed | 1971-06-23 | 1973-10-02 | 0 | Details |
| US3763273A | Imido substituted polyamide compositions blended with polyv… | Expired / Lapsed | 1971-04-21 | 1973-10-02 | 0 | Details |
| US3757586A | Pneumatic analogue decompression instrument | Expired / Lapsed | 1971-09-16 | 1973-09-11 | 10 | Details |
| US3751519A | Compatible polycarbonate-siloxane composition | Expired / Lapsed | 1971-07-29 | 1973-08-07 | 0 | Details |
| US3742397A | Electronic oven with ferrite rf rejection filters | Expired / Lapsed | 1971-07-16 | 1973-06-26 | 17 | Details |
| US3739644A | Linearization of differential pressure integral silicon tra… | Expired / Lapsed | 1972-06-30 | 1973-06-19 | 12 | Details |
| US3740591A | Bucket-brigade tuned sampled data filter | Expired / Lapsed | 1972-02-25 | 1973-06-19 | 30 | Details |
| US3738731A | Varying area optical processing fourier analyzer | Expired / Lapsed | 1971-08-25 | 1973-06-12 | 2 | Details |
| US3739369A | Historical data display | Expired / Lapsed | 1971-01-04 | 1973-06-12 | 8 | Details |
| US3737212A | Diffraction optics head up display | Expired / Lapsed | 1970-12-14 | 1973-06-05 | 17 | Details |
| US3735766A | Optional unipolar-bipolar body organ stimulator | Expired / Lapsed | 1971-04-19 | 1973-05-29 | 18 | Details |
| US3729446A | Imido-substituted polyester compositions | Expired / Lapsed | 1971-04-30 | 1973-04-24 | 0 | Details |
| US3727034A | Counting system for a plurality of locations | Expired / Lapsed | 1972-01-19 | 1973-04-10 | 8 | Details |
| US3723823A | Printed circuit board guide | Expired / Lapsed | 1971-11-30 | 1973-03-27 | 8 | Details |
| US3723005A | Wide angle sighting apparatus | Expired / Lapsed | 1965-12-13 | 1973-03-27 | 14 | Details |
| US3720941A | Automatic monopulse clutter cancellation circuit | Expired / Lapsed | 1970-04-13 | 1973-03-13 | 10 | Details |
| US3720046A | Flow distribution apparatus | Expired / Lapsed | 1969-06-05 | 1973-03-13 | 0 | Details |
| US3718962A | High temperature metallic diffusion coating | Expired / Lapsed | 1970-09-28 | 1973-03-06 | 3 | Details |
| US3718852A | Phase angle regulator for high frequency inverter | Expired / Lapsed | 1971-07-14 | 1973-02-27 | 7 | Details |
| US3717153A | Standby external rate control and implanted standby heart p… | Expired / Lapsed | 1970-10-19 | 1973-02-20 | 14 | Details |
| US3715334A | Platinum-vinylsiloxanes | Expired / Lapsed | 1970-11-27 | 1973-02-06 | 7 | Details |
| US3715274A | Nuclear fuel assembly with reinforced flow channel | Expired / Lapsed | 1969-08-15 | 1973-02-06 | 9 | Details |
| FR2142277A5 | Antithrombogenic surfaces | Expired / Lapsed | 1971-06-18 | 1973-01-26 | 0 | Details |
| US3710778A | Blood gas sensor amplifier and testing system | Expired / Lapsed | 1971-03-15 | 1973-01-16 | 14 | Details |
| US3711520A | Flame retardant compositions | Expired / Lapsed | 1970-09-04 | 1973-01-16 | 15 | Details |
| US3709626A | Digital analog electrohydraulic turbine control system | Expired / Lapsed | 1971-09-16 | 1973-01-09 | 7 | Details |
| US3710267A | Envelope rate demodulator | Expired / Lapsed | 1970-05-05 | 1973-01-09 | 6 | Details |
| US3708467A | Curable compositions | Expired / Lapsed | 1971-06-16 | 1973-01-02 | 0 | Details |
| US3708664A | Diagnostic x-ray system | Expired / Lapsed | 1970-11-12 | 1973-01-02 | 18 | Details |
| US3706885A | Photocathode-phosphor imaging system for x-ray camera tubes | Expired / Lapsed | 1971-01-29 | 1972-12-19 | 3 | Details |
| US3701753A | Solutions of room temperature vulcanizable silicone rubber … | Expired / Lapsed | 1970-09-28 | 1972-10-31 | 0 | Details |
| US3701102A | Noise error correcting and excessive noise rejecting system | Expired / Lapsed | 1971-05-03 | 1972-10-24 | 9 | Details |
| US3701003A | Current transformers with improved coaxial feed | Expired / Lapsed | 1970-12-14 | 1972-10-24 | 10 | Details |
| US3699544A | Three transistor memory cell | Expired / Lapsed | 1971-05-26 | 1972-10-17 | 10 | Details |
| US3699341A | Muzzle flash detector | Expired / Lapsed | 1968-09-23 | 1972-10-17 | 14 | Details |
| US3697918A | Silicon diaphragm pressure sensor having improved configura… | Expired / Lapsed | 1971-08-03 | 1972-10-10 | 7 | Details |
| US3697917A | Semiconductor strain gage pressure transducer | Expired / Lapsed | 1971-08-02 | 1972-10-10 | 8 | Details |
| US3697829A | Semiconductor devices with improved voltage breakdown chara… | Expired / Lapsed | 1968-12-30 | 1972-10-10 | 19 | Details |
| US3694643A | System and method of channel performance monitoring | Expired / Lapsed | 1970-09-30 | 1972-09-26 | 13 | Details |
| US3689699A | Synchronizing system | Expired / Lapsed | 1971-04-12 | 1972-09-05 | 9 | Details |
| US3687365A | Thermostatic flow controller | Expired / Lapsed | 1970-09-10 | 1972-08-29 | 6 | Details |
| US3686355A | Shaped composition of polymer and surface modifying block c… | Expired / Lapsed | 1970-05-08 | 1972-08-22 | 3 | Details |
| US3678987A | Elastomeric mold lining for making wax replica of complex p… | Expired / Lapsed | 1970-12-28 | 1972-07-25 | 4 | Details |
| US3679953A | Compatible brushless reluctance motors and controlled switc… | Expired / Lapsed | 1970-11-06 | 1972-07-25 | 13 | Details |
| US3680002A | Microstrip microwave oscillators | Expired / Lapsed | 1970-10-19 | 1972-07-25 | 17 | Details |
| US3679996A | Face-pumped laser device with laterally positioned pumping … | Expired / Lapsed | 1970-08-03 | 1972-07-25 | 33 | Details |
| US3678736A | Machine with improved operating head traversing workpieces … | Expired / Lapsed | 1970-08-03 | 1972-07-25 | 11 | Details |
| US3679894A | Acceleration control system for vehicles | Expired / Lapsed | 1970-07-09 | 1972-07-25 | 14 | Details |
| US3680121A | Mobile locator system for metropolitan areas | Expired / Lapsed | 1970-01-02 | 1972-07-25 | 13 | Details |
| US3679941A | Composite integrated circuits including semiconductor chips… | Expired / Lapsed | 1969-09-22 | 1972-07-25 | 7 | Details |
| US3678436A | Magnetizing apparatus and method | Expired / Lapsed | 1971-05-24 | 1972-07-18 | 16 | Details |
| US3678352A | Compatible permanent magnet or reluctance brushless motors … | Expired / Lapsed | 1970-11-06 | 1972-07-18 | 18 | Details |
| US3677800A | Anti-thrombogenic coatings and products | Expired / Lapsed | 1970-03-18 | 1972-07-18 | 0 | Details |
| US3676656A | Electronic digital slide rule | Expired / Lapsed | 1969-06-30 | 1972-07-11 | 21 | Details |
| US3675232A | Video generator for data display | Expired / Lapsed | 1969-05-21 | 1972-07-04 | 11 | Details |
| US3673455A | High speed sensor for initiating circuit breaker tripping | Expired / Lapsed | 1970-11-18 | 1972-06-27 | 8 | Details |
| US3673272A | Block copolymers of silicones with vinyl pyridine | Expired / Lapsed | 1970-04-06 | 1972-06-27 | 4 | Details |
| US3673051A | Pyrolytic graphite | Expired / Lapsed | 1969-03-20 | 1972-06-27 | 2 | Details |
| US3671902A | Shielded inductive device | Expired / Lapsed | 1971-05-25 | 1972-06-20 | 12 | Details |
| US3671831A | Induction motor speed control | Expired / Lapsed | 1971-03-05 | 1972-06-20 | 7 | Details |
| US3670403A | Three masking step process for fabricating insulated gate f… | Expired / Lapsed | 1970-03-19 | 1972-06-20 | 3 | Details |
| US3669849A | Complexly shaped articles formed by deposition processes | Expired / Lapsed | 1969-10-16 | 1972-06-13 | 1 | Details |
| US3666526A | Refractory porous bodies | Expired / Lapsed | 1966-01-06 | 1972-05-30 | 0 | Details |
| US3665168A | Adaptively controlled position prediction system | Expired / Lapsed | 1970-12-18 | 1972-05-23 | 8 | Details |
| US3663906A | Electric circuit breaker with magnetically assisted closing… | Expired / Lapsed | 1969-10-09 | 1972-05-16 | 18 | Details |
| US3662276A | Bumpless transfer circuits for process control systems | Expired / Lapsed | 1970-10-02 | 1972-05-09 | 9 | Details |
| US3662356A | Integrated circuit bistable memory cell using charge-pumped… | Expired / Lapsed | 1970-08-28 | 1972-05-09 | 14 | Details |
| US3662163A | Digital signal linearizer | Expired / Lapsed | 1970-08-04 | 1972-05-09 | 8 | Details |
| US3661817A | Curable compositions | Expired / Lapsed | 1970-05-04 | 1972-05-09 | 0 | Details |
| US3661685A | Laminated assembly of polycarbonate and polyacrylate resin … | Expired / Lapsed | 1968-10-28 | 1972-05-09 | 10 | Details |
| US3660345A | Organopolysiloxane elastomer compositions | Expired / Lapsed | 1968-09-09 | 1972-05-02 | 0 | Details |
| US3658183A | Filter holder | Expired / Lapsed | 1970-03-19 | 1972-04-25 | 6 | Details |
| US3657503A | Terminal enclosure | Expired / Lapsed | 1970-08-27 | 1972-04-18 | 5 | Details |
| US3657525A | Direct feed rate control circuit | Expired / Lapsed | 1970-03-17 | 1972-04-18 | 12 | Details |
| US3657404A | Method and apparatus for cleaving anisotropic pyrolytically… | Expired / Lapsed | 1969-05-28 | 1972-04-18 | 0 | Details |
| US3653180A | Block copolymer membrane for separating polar contaminants … | Expired / Lapsed | 1970-11-02 | 1972-04-04 | 13 | Details |
| US3652716A | Imido-substituted polyester compositions | Expired / Lapsed | 1969-07-01 | 1972-03-28 | 0 | Details |
| US3650673A | Dry wash fabric cleaning method and apparatus | Expired / Lapsed | 1969-11-24 | 1972-03-21 | 5 | Details |
| US3650846A | Process for reconstituting the grain structure of metal sur… | Expired / Lapsed | 1968-11-04 | 1972-03-21 | 8 | Details |
| US3646665A | Complementary mis-fet devices and method of fabrication | Expired / Lapsed | 1970-05-22 | 1972-03-07 | 14 | Details |
| US3646399A | Printed circuit board construction | Expired / Lapsed | 1970-03-04 | 1972-02-29 | 8 | Details |
| US3644873A | Electrical connector for a radio receptacle | Expired / Lapsed | 1970-10-22 | 1972-02-22 | 5 | Details |
| US3640887A | Transparent zirconia- hafnia- and thoria-rare earth ceramics | Expired / Lapsed | 1970-04-06 | 1972-02-08 | 0 | Details |
| US3640943A | Polymer-filler composition | Expired / Lapsed | 1969-07-07 | 1972-02-08 | 0 | Details |
| US3639699A | Magnetic transducer having a composite magnetic core struct… | Expired / Lapsed | 1970-02-27 | 1972-02-01 | 10 | Details |
| US3636330A | Autonomous space navigation system utilizing holographic re… | Expired / Lapsed | 1967-03-14 | 1972-01-18 | 23 | Details |
| US3628129A | Process controller including a rate circuit responsive sole… | Expired / Lapsed | 1970-10-01 | 1971-12-14 | 7 | Details |
| US3627996A | Buffer memory for digital equipment having variable rate in… | Expired / Lapsed | 1968-02-29 | 1971-12-14 | 27 | Details |
| US3628002A | On-machine inspection systems | Expired / Lapsed | 1967-11-21 | 1971-12-14 | 19 | Details |
| US3625745A | Antithrombogenic article and process | Expired / Lapsed | 1970-03-18 | 1971-12-07 | 12 | Details |
| US3626135A | Electronic oven with ferrite rf rejection filters | Expired / Lapsed | 1969-11-19 | 1971-12-07 | 10 | Details |
| US3626306A | Automatic baud synchronizer | Expired / Lapsed | 1969-10-23 | 1971-12-07 | 17 | Details |
| US3624435A | Disc-type inductor eddy current machine | Expired / Lapsed | 1970-07-29 | 1971-11-30 | 10 | Details |
| US3624603A | Digital data communications system with means for improving… | Expired / Lapsed | 1969-09-16 | 1971-11-30 | 25 | Details |
| US3622849A | Thyristor junction temperature monitor | Expired / Lapsed | 1970-06-23 | 1971-11-23 | 13 | Details |
| US3623003A | Subscriber-response unit | Expired / Lapsed | 1970-03-03 | 1971-11-23 | 14 | Details |
| US3622882A | Reactance circuit tester | Expired / Lapsed | 1969-06-11 | 1971-11-23 | 4 | Details |
| US3623026A | Mis device and method for storing information and providing… | Expired / Lapsed | 1969-01-21 | 1971-11-23 | 22 | Details |
| US3621469A | Voltage controlled oscillator | Expired / Lapsed | 1969-08-21 | 1971-11-16 | 11 | Details |
| US3619788A | Circuit for giving priority to one of a plurality of automa… | Expired / Lapsed | 1969-04-14 | 1971-11-09 | 8 | Details |
| US3618048A | Random access large-capacity memories | Expired / Lapsed | 1968-07-25 | 1971-11-02 | 23 | Details |
| US3614855A | Continuous production of calibration gas flows | Expired / Lapsed | 1967-12-26 | 1971-10-26 | 0 | Details |
| US3614404A | Electronic calculator | Expired / Lapsed | 1969-04-17 | 1971-10-19 | 7 | Details |
| US3608546A | Fluidic spirometer | Expired / Lapsed | 1970-01-21 | 1971-09-28 | 20 | Details |
| US3609306A | Sequential code reader | Expired / Lapsed | 1969-12-08 | 1971-09-28 | 33 | Details |
| US3609379A | Photoelectric drop sensing and timing control for intraveno… | Expired / Lapsed | 1969-05-13 | 1971-09-28 | 15 | Details |
| US3609698A | Control station for two-way address communication network | Expired / Lapsed | 1968-11-27 | 1971-09-28 | 9 | Details |
| US3604804A | Noncontacting motion sensor | Expired / Lapsed | 1968-12-27 | 1971-09-14 | 9 | Details |
| US3602994A | Pulse generator system responsive to spindle motor rotation… | Expired / Lapsed | 1970-03-12 | 1971-09-07 | 21 | Details |
| US3598984A | Photoflash lamp array | Expired / Lapsed | 1968-12-16 | 1971-08-10 | 11 | Details |
| US3595227A | Diving vest | Expired / Lapsed | 1969-03-07 | 1971-07-27 | 3 | Details |
| US3592953A | Preparation of high flow cellulose derivative reverse osmos… | Expired / Lapsed | 1967-10-02 | 1971-07-13 | 0 | Details |
| US3588980A | Method for making a contoured article | Expired / Lapsed | 1969-07-17 | 1971-06-29 | 0 | Details |
| US3588856A | Failure warning system | Expired / Lapsed | 1968-07-17 | 1971-06-28 | 0 | Details |
| US3582756A | Polyphase power converter circuits having a high frequency … | Expired / Lapsed | 1970-02-12 | 1971-06-01 | 21 | Details |
| US3579805A | Method of forming interference fits by heat treatment | Expired / Lapsed | 1968-07-05 | 1971-05-25 | 11 | Details |
| US3578959A | Digital resolver with alternately phased digital differenti… | Expired / Lapsed | 1967-12-22 | 1971-05-18 | 10 | Details |
| US3578425A | Diamond and boron nitride particles coated with a polymeriz… | Expired / Lapsed | 1967-03-14 | 1971-05-11 | 0 | Details |
| US3577187A | Digital information transfer system having integrity check | Expired / Lapsed | 1968-09-03 | 1971-05-04 | 16 | Details |
| US3573597A | High current switching regulator with overlapped output cur… | Expired / Lapsed | 1969-12-29 | 1971-04-06 | 17 | Details |
| US3573357A | Skip-field recorder with electronically controlled stop act… | Expired / Lapsed | 1968-04-24 | 1971-04-06 | 5 | Details |
| US3573432A | System for reading coded information from punched cards wit… | Expired / Lapsed | 1967-04-10 | 1971-04-06 | 13 | Details |
| US3572660A | Device for dispensing inhalable fluids | Expired / Lapsed | 1967-08-04 | 1971-03-30 | 7 | Details |
| US3572109A | Integral semiconductor strain gage transducers with frequen… | Expired / Lapsed | 1968-08-09 | 1971-03-23 | 0 | Details |
| US3569672A | Low thermal mass, plate surface heating unit | Expired / Lapsed | 1969-05-01 | 1971-03-09 | 22 | Details |
| US3569940A | Remote alarm for visual display terminals | Expired / Lapsed | 1968-06-10 | 1971-03-09 | 22 | Details |
| US3567854A | Automatic brightness control for x-ray image intensifier sy… | Expired / Lapsed | 1968-10-23 | 1971-03-02 | 8 | Details |
| US3566517A | Self-registered ig-fet devices and method of making same | Expired / Lapsed | 1967-10-13 | 1971-03-02 | 0 | Details |
| US3566008A | Mechanical and electrical joint between copper and aluminum… | Expired / Lapsed | 1969-07-15 | 1971-02-23 | 3 | Details |
| US3563247A | Bidirectional heart stimulator | Expired / Lapsed | 1968-03-14 | 1971-02-16 | 3 | Details |
| US3564273A | Pulse width modulated control system with external feedback… | Expired / Lapsed | 1967-11-09 | 1971-02-16 | 28 | Details |
| US3561216A | Thermal stress controlled loading of steam turbine-generato… | Expired / Lapsed | 1969-03-19 | 1971-02-09 | 0 | Details |
| US3562717A | System protection apparatus | Expired / Lapsed | 1968-02-23 | 1971-02-09 | 0 | Details |
| US3562715A | Repeat pattern control for automatic machines | Expired / Lapsed | 1967-11-15 | 1971-02-09 | 0 | Details |
| US3560829A | Pulse width modulated bridge power amplifier with memory an… | Expired / Lapsed | 1969-01-28 | 1971-02-02 | 0 | Details |
| US3560815A | Voltage-variable capacitor with extendible pn junction regi… | Expired / Lapsed | 1968-10-10 | 1971-02-02 | 15 | Details |
| US3560852A | Electrical waveform analyzer and data tabulation system com… | Expired / Lapsed | 1968-09-30 | 1971-02-02 | 0 | Details |
| US3559187A | Input/output controller with linked data control words | Expired / Lapsed | 1968-11-13 | 1971-01-26 | 0 | Details |
| US3559177A | Variable length,diverse format digital information transfer… | Expired / Lapsed | 1968-09-03 | 1971-01-26 | 0 | Details |
| US3556675A | Turbomachinery rotor with integral shroud | Expired / Lapsed | 1969-01-29 | 1971-01-19 | 0 | Details |
| US3554646A | Optical distance gage | Expired / Lapsed | 1969-01-28 | 1971-01-12 | 0 | Details |
| US3555512A | Two frequency reed decoder and selective signalling device | Expired / Lapsed | 1967-12-20 | 1971-01-12 | 0 | Details |
| US3554809A | Process and apparatus for distributing fluid inerts with re… | Expired / Lapsed | 1967-12-18 | 1971-01-12 | 0 | Details |
| US3553282A | Siloxane containing polyamide acid blends | Expired / Lapsed | 1969-09-08 | 1971-01-05 | 0 | Details |
| US3553656A | Selector for the dynamic assignment of priority on a period… | Expired / Lapsed | 1969-06-03 | 1971-01-05 | 0 | Details |
| US3552115A | Interval timer for providing a fixed and locked timed cycle | Expired / Lapsed | 1969-05-02 | 1971-01-05 | 0 | Details |
| US3551663A | Multiplication apparatus in a data processing system with a… | Expired / Lapsed | 1965-04-15 | 1970-12-29 | 0 | Details |
| US3548806A | Mass emotional reaction measurement system | Expired / Lapsed | 1968-06-26 | 1970-12-22 | 0 | Details |
| US3549971A | Reversing controller | Expired / Lapsed | 1968-05-09 | 1970-12-22 | 0 | Details |
| US3549847A | Graphite susceptor | Expired / Lapsed | 1967-04-18 | 1970-12-22 | 0 | Details |
| US3550084A | System and method for identifying a set of graphic characte… | Expired / Lapsed | 1966-06-27 | 1970-12-22 | 0 | Details |
| US3548246A | Biconical log periodic amplifier | Expired / Lapsed | 1966-09-29 | 1970-12-15 | 0 | Details |
| US3546435A | Pure solid state self-cleaning oven control | Expired / Lapsed | 1969-07-25 | 1970-12-08 | 0 | Details |
| US3542543A | Nickel base brazing alloy | Expired / Lapsed | 1969-01-02 | 1970-11-24 | 0 | Details |
| US3543244A | Information handling system | Expired / Lapsed | 1968-01-04 | 1970-11-24 | 0 | Details |
| US3541676A | Method of forming field-effect transistors utilizing doped … | Expired / Lapsed | 1967-12-18 | 1970-11-24 | 0 | Details |
| US3541257A | Communication response unit | Expired / Lapsed | 1968-11-27 | 1970-11-17 | 0 | Details |
| US3541018A | Infrared-excitable ytterbium sensitized erbium or thulium a… | Expired / Lapsed | 1968-09-18 | 1970-11-17 | 0 | Details |
| US3541320A | Drift compensation for integrating amplifiers | Expired / Lapsed | 1968-08-07 | 1970-11-17 | 0 | Details |
| US3540797A | High resolution projection system utilizing an output light… | Expired / Lapsed | 1968-03-07 | 1970-11-17 | 0 | Details |
| US3541513A | Communications control apparatus for sequencing digital dat… | Expired / Lapsed | 1967-09-01 | 1970-11-17 | 0 | Details |
| US3541517A | Apparatus providing inter-processor communication and progr… | Expired / Lapsed | 1966-05-19 | 1970-11-17 | 0 | Details |
| US3539530A | Flame resistant organopolysiloxane compositions | Expired / Lapsed | 1968-03-01 | 1970-11-10 | 0 | Details |
| US3539989A | Symbol reading system | Expired / Lapsed | 1966-05-31 | 1970-11-10 | 0 | Details |
| US3537319A | Silicon diaphragm with optimized integral strain gages | Expired / Lapsed | 1968-07-26 | 1970-11-03 | 0 | Details |
| US3537925A | Method of forming a fine line apertured film | Expired / Lapsed | 1967-03-14 | 1970-11-03 | 0 | Details |
| US3536878A | Electronic heating apparatus including microwave coupling s… | Expired / Lapsed | 1968-12-31 | 1970-10-27 | 0 | Details |
| US3536877A | Wafer construction for a switch tuner | Expired / Lapsed | 1968-03-14 | 1970-10-27 | 0 | Details |
| US3535503A | Multiplier-divider computing circuit | Expired / Lapsed | 1968-09-12 | 1970-10-20 | 0 | Details |
| US3535443A | X-ray image viewing apparatus | Expired / Lapsed | 1968-07-22 | 1970-10-20 | 0 | Details |
| US3534132A | Method of making an insulated sodium cable | Expired / Lapsed | 1967-05-09 | 1970-10-13 | 0 | Details |
| US3534351A | Light coupled battery powered remote control apparatus | Expired / Lapsed | 1967-04-07 | 1970-10-13 | 0 | Details |
| US3532426A | Holographic fingerprint identification | Expired / Lapsed | 1967-11-08 | 1970-10-06 | 0 | Details |
| US3532126A | Ganged variable fluidic resistor device | Expired / Lapsed | 1967-11-01 | 1970-10-06 | 0 | Details |
| US3531627A | Transit ticket having fare coding means for automatic fare … | Expired / Lapsed | 1965-05-06 | 1970-09-29 | 0 | Details |
| US3529961A | Formation of thin films of gold,nickel or copper by photoly… | Expired / Lapsed | 1966-12-27 | 1970-09-22 | 0 | Details |
| US3528241A | Gas turbine engine lubricant sump vent and circulating syst… | Expired / Lapsed | 1969-02-24 | 1970-09-15 | 0 | Details |
| US3527976A | Log periodic electron discharge device | Expired / Lapsed | 1966-09-29 | 1970-09-08 | 0 | Details |
| US3525080A | Data storage control apparatus for a multiprogrammed data p… | Expired / Lapsed | 1968-02-27 | 1970-08-18 | 0 | Details |
| US3524997A | Monolithic integrated phase control circuits | Expired / Lapsed | 1967-09-08 | 1970-08-18 | 0 | Details |
| US3524986A | Semiconductor light gating of light activated semiconductor… | Expired / Lapsed | 1967-02-06 | 1970-08-18 | 0 | Details |
| US3525029A | Pulse width modulation power switching servo amplifier and … | Expired / Lapsed | 1967-01-03 | 1970-08-18 | 0 | Details |
| US3524447A | Method of making a rigid tipped polyvinyl catheter | Expired / Lapsed | 1964-04-06 | 1970-08-18 | 0 | Details |
| US3522522A | Dual charging of a capacitor to produce a constant a.c. vol… | Expired / Lapsed | 1968-02-15 | 1970-08-04 | 0 | Details |
| US3521235A | Pattern recognition system | Expired / Lapsed | 1965-07-08 | 1970-07-21 | 0 | Details |
| US3519282A | Abradable material seal | Expired / Lapsed | 1966-03-11 | 1970-07-07 | 0 | Details |
| US3517663A | Threshold analyzer for an implanted heart stimulator | Expired / Lapsed | 1968-04-15 | 1970-06-30 | 0 | Details |
| US3517669A | Valved suction catheter | Expired / Lapsed | 1968-03-12 | 1970-06-30 | 0 | Details |
| US3514424A | Flame retardant compositions | Expired / Lapsed | 1969-05-19 | 1970-05-26 | 0 | Details |
| US3512136A | Input/output control apparatus in a computer system | Expired / Lapsed | 1967-06-21 | 1970-05-12 | 0 | Details |
| US3510850A | Drive circuitry for negative resistance device matrix | Expired / Lapsed | 1968-04-30 | 1970-05-05 | 0 | Details |
| US3509883A | Expanding cannula | Expired / Lapsed | 1967-11-29 | 1970-05-05 | 0 | Details |
| US3510844A | Interprocessing multicomputer systems | Expired / Lapsed | 1966-07-27 | 1970-05-05 | 0 | Details |
| US3510747A | Two part separable battery charger | Expired / Lapsed | 1964-04-02 | 1970-05-05 | 0 | Details |
| US3505651A | Data storage access control apparatus for a multicomputer s… | Expired / Lapsed | 1967-02-28 | 1970-04-07 | 0 | Details |
| US3505647A | Apparatus providing alterable symbolic memory addressing in… | Expired / Lapsed | 1966-04-18 | 1970-04-07 | 0 | Details |
| US3503850A | Blood oxygenator | Expired / Lapsed | 1967-11-29 | 1970-03-31 | 0 | Details |
| US3504344A | Apparatus for establishing indirect communication between p… | Expired / Lapsed | 1966-05-27 | 1970-03-31 | 0 | Details |
| US3504302A | Frequency controlled semiconductor junction laser | Expired / Lapsed | 1964-09-24 | 1970-03-31 | 0 | Details |
| US3503061A | Telemetering system with optoelectronic coupling between tr… | Expired / Lapsed | 1966-07-20 | 1970-03-24 | 0 | Details |
| US3501090A | Composite bladed rotors | Expired / Lapsed | 1968-01-29 | 1970-03-17 | 0 | Details |
| US3500559A | Electronic system for accepting and processing responses to… | Expired / Lapsed | 1967-09-11 | 1970-03-17 | 0 | Details |
| US3500336A | Means for extracting synchronizing signals from television … | Expired / Lapsed | 1967-08-29 | 1970-03-10 | 0 | Details |
| US3500190A | Vehicle velocity measuring system employing adjustable widt… | Expired / Lapsed | 1967-06-23 | 1970-03-10 | 0 | Details |
| US3500329A | Data processing system | Expired / Lapsed | 1966-10-06 | 1970-03-10 | 0 | Details |
| US3500334A | Externally controlled data processing unit | Expired / Lapsed | 1964-05-04 | 1970-03-10 | 0 | Details |
| US3500333A | Data processing unit for providing memory storage of commun… | Expired / Lapsed | 1964-05-04 | 1970-03-10 | 0 | Details |
| US3496342A | Card reader logic | Expired / Lapsed | 1966-08-30 | 1970-02-17 | 0 | Details |
| US3495147A | Magnetic positioning device for computer disc files and oth… | Expired / Lapsed | 1967-12-28 | 1970-02-10 | 0 | Details |
| US3493709A | Spiral antenna for electronic oven | Expired / Lapsed | 1968-10-25 | 1970-02-03 | 0 | Details |
| US3492588A | Median selector for redundant analog signals | Expired / Lapsed | 1965-02-24 | 1970-01-27 | 0 | Details |
| US3490003A | Data transfer priority apparatus | Expired / Lapsed | 1960-07-29 | 1970-01-13 | 0 | Details |
| US3487289A | Multipurpose power converter circuits | Expired / Lapsed | 1968-04-16 | 1969-12-30 | 0 | Details |
| US3487400A | System for extended resolution of a binary coded pattern de… | Expired / Lapsed | 1966-06-30 | 1969-12-30 | 0 | Details |
| US3487373A | Apparatus providing symbolic memory addressing in a multico… | Expired / Lapsed | 1965-11-16 | 1969-12-30 | 0 | Details |
| US3486029A | Radiative interconnection arrangement | Expired / Lapsed | 1965-12-29 | 1969-12-23 | 0 | Details |
| US3483359A | Temperature control circuit | Expired / Lapsed | 1967-12-29 | 1969-12-09 | 0 | Details |
| US3483525A | Intercommunicating multiple data processing system | Expired / Lapsed | 1966-06-06 | 1969-12-09 | 0 | Details |
| US3483522A | Priority apparatus in a computer system | Expired / Lapsed | 1966-05-26 | 1969-12-09 | 0 | Details |
| US3483521A | Program request storage and control apparatus in a multipro… | Expired / Lapsed | 1966-05-13 | 1969-12-09 | 0 | Details |
| US3482186A | Laser oscillator with single transverse mode output | Expired / Lapsed | 1967-06-14 | 1969-12-02 | 0 | Details |
| US3482265A | Data processing system including means for awarding priorit… | Expired / Lapsed | 1966-07-22 | 1969-12-02 | 0 | Details |
| US3482264A | Data processing system including communication priority and… | Expired / Lapsed | 1966-07-07 | 1969-12-02 | 0 | Details |
| US3480843A | Thin-film storage diode with tellurium counterelectrode | Expired / Lapsed | 1967-04-18 | 1969-11-25 | 0 | Details |
| US3480916A | Apparatus providing identification of programs in a multipr… | Expired / Lapsed | 1967-01-30 | 1969-11-25 | 0 | Details |
| US3479234A | Method of producing field effect transistors | Expired / Lapsed | 1967-05-01 | 1969-11-18 | 0 | Details |
| US3479649A | Data processing system including means for masking program … | Expired / Lapsed | 1966-07-22 | 1969-11-18 | 0 | Details |
| US3479647A | Data process system including means responsive to predeterm… | Expired / Lapsed | 1966-06-03 | 1969-11-18 | 0 | Details |
| US3478280A | Pulse width modulated laser | Expired / Lapsed | 1966-10-14 | 1969-11-11 | 0 | Details |
| US3476993A | Five layer and junction bridging terminal switching device | Expired / Lapsed | 1959-09-08 | 1969-11-04 | 0 | Details |
| US3475729A | Input/output control apparatus in a computer system | Expired / Lapsed | 1966-05-27 | 1969-10-28 | 0 | Details |
| US3475730A | Information shift apparatus in a computer system | Expired / Lapsed | 1966-05-27 | 1969-10-28 | 0 | Details |
| US3475731A | Dual control apparatus in data processing equipment | Expired / Lapsed | 1966-05-27 | 1969-10-28 | 0 | Details |
| US3473024A | X-ray tabletop extension and tilt control | Expired / Lapsed | 1967-10-23 | 1969-10-14 | 0 | Details |
| US3472234A | Body organ electrode | Expired / Lapsed | 1967-08-15 | 1969-10-14 | 0 | Details |
| US3473159A | Data processing system including means for protecting prede… | Expired / Lapsed | 1966-07-07 | 1969-10-14 | 0 | Details |
| US3473154A | Data processing unit for providing sequential memory access… | Expired / Lapsed | 1964-05-04 | 1969-10-14 | 0 | Details |
| US3473155A | Apparatus providing access to storage device on priority-al… | Expired / Lapsed | 1964-05-04 | 1969-10-14 | 0 | Details |
| US3469241A | Data processing apparatus providing contiguous addressing f… | Expired / Lapsed | 1966-05-02 | 1969-09-23 | 0 | Details |
| US3467891A | Combination electrical,mechanical,and thermal connector ass… | Expired / Lapsed | 1967-10-03 | 1969-09-16 | 0 | Details |
| US3466526A | Frequency to d.-c. converter | Expired / Lapsed | 1968-01-05 | 1969-09-09 | 0 | Details |
| US3466166A | Method for making a hollow metal article | Expired / Lapsed | 1967-01-03 | 1969-09-09 | 0 | Details |
| US3465228A | Pulse width control for adjustable speed drive system | Expired / Lapsed | 1967-05-19 | 1969-09-02 | 0 | Details |
| US3462605A | Semiconductor light-emitter and combination light-emitter-p… | Expired / Lapsed | 1965-09-22 | 1969-08-19 | 0 | Details |
| US3460816A | Fluxless aluminum brazing furnace | Expired / Lapsed | 1967-10-19 | 1969-08-12 | 0 | Details |
| US3460145A | Electronic scanning system for wave energy beam forming and… | Expired / Lapsed | 1968-03-14 | 1969-08-05 | 0 | Details |
| US3459943A | Silicon controlled rectifier gating circuits with a high fr… | Expired / Lapsed | 1967-02-06 | 1969-08-05 | 0 | Details |
| US3458806A | Sequential tester for interpin impedances including resisto… | Expired / Lapsed | 1966-02-03 | 1969-07-29 | 0 | Details |
| US3458341A | Metal boride-metal carbide-graphite deposition | Expired / Lapsed | 1964-08-10 | 1969-07-29 | 0 | Details |
| US3452252A | Device for protecting electrical apparatus | Expired / Lapsed | 1966-01-28 | 1969-06-24 | 0 | Details |
| US3450153A | Electrical pulse generator and regulator for fluid flow and… | Expired / Lapsed | 1967-06-26 | 1969-06-17 | 0 | Details |
| US3449554A | Offset compensation for numerical controls | Expired / Lapsed | 1967-08-28 | 1969-06-10 | 0 | Details |
| US3448367A | Inverter inhibit circuits | Expired / Lapsed | 1966-09-19 | 1969-06-03 | 0 | Details |
| US3446224A | Rotor stress controlled startup system | Expired / Lapsed | 1967-01-03 | 1969-05-27 | 0 | Details |
| US3444525A | Centrally controlled multicomputer system | Expired / Lapsed | 1966-04-15 | 1969-05-13 | 0 | Details |
| US3441893A | Resistance temperature detector | Expired / Lapsed | 1966-12-28 | 1969-04-29 | 0 | Details |
| US3441534A | Curable compositions | Expired / Lapsed | 1966-01-03 | 1969-04-29 | 0 | Details |
| US3441885A | High voltage current transformer having rigid secondary eye… | Expired / Lapsed | 1965-06-14 | 1969-04-29 | 0 | Details |
| US3440462A | Dynamoelectric machine gap pick rotor wedges | Expired / Lapsed | 1966-03-03 | 1969-04-22 | 0 | Details |
| US3440482A | Raster distortion correction transformer | Expired / Lapsed | 1966-02-14 | 1969-04-22 | 0 | Details |
| US3439144A | Electronic oven | Expired / Lapsed | 1967-06-29 | 1969-04-15 | 0 | Details |
| US3439347A | Sub-word length arithmetic apparatus | Expired / Lapsed | 1966-12-13 | 1969-04-15 | 2 | Details |
| US3438504A | Filter element and method of production | Expired / Lapsed | 1966-08-11 | 1969-04-15 | 0 | Details |
| US3439283A | Frequency shift keyed discriminating circuits | Expired / Lapsed | 1966-02-04 | 1969-04-15 | 0 | Details |
| US3439329A | Electronic error detection and message routing system for a… | Expired / Lapsed | 1965-05-05 | 1969-04-15 | 0 | Details |
| US3437784A | Power supply for reducing arcing damage in glow discharge a… | Expired / Lapsed | 1966-02-16 | 1969-04-08 | 0 | Details |
| US3436366A | Silicone potting compositions comprising mixtures of organo… | Expired / Lapsed | 1965-12-17 | 1969-04-01 | 0 | Details |
| US3432846A | Traveling sign controlled by logic circuitry and providing … | Expired / Lapsed | 1965-04-19 | 1969-03-11 | 0 | Details |
| US3431483A | Cycloconverter power circuits | Expired / Lapsed | 1966-12-30 | 1969-03-04 | 0 | Details |
| US3430640A | Supersonic inlet | Expired / Lapsed | 1964-02-17 | 1969-03-04 | 2 | Details |
| US3429020A | Process for construction of high temperature capacitor | Expired / Lapsed | 1967-05-23 | 1969-02-25 | 0 | Details |
| US3430209A | Memory utilization apparatus and method | Expired / Lapsed | 1966-11-25 | 1969-02-25 | 2 | Details |
| US3430088A | Wire terminal electroluminescent device and manufacture | Expired / Lapsed | 1966-09-30 | 1969-02-25 | 2 | Details |
| US3428250A | Furnace control system | Expired / Lapsed | 1967-05-23 | 1969-02-18 | 0 | Details |
| US3428792A | Velocity control system | Expired / Lapsed | 1965-06-21 | 1969-02-18 | 0 | Details |
| US3428876A | Absolute feedrate velocity control for multiaxes pulse resp… | Expired / Lapsed | 1965-01-18 | 1969-02-18 | 0 | Details |
| US3426748A | Stimulator analyzer and locater | Expired / Lapsed | 1965-11-23 | 1969-02-11 | 0 | Details |
| US3427585A | Data receiving and transmitting system | Expired / Lapsed | 1965-05-19 | 1969-02-11 | 0 | Details |
| US3427437A | Kinematic sight | Expired / Lapsed | 1964-09-15 | 1969-02-11 | 0 | Details |
| US3425039A | Data processing system employing indirect character address… | Expired / Lapsed | 1966-06-27 | 1969-01-28 | 0 | Details |
| US3424898A | Binary subtracter for numerical control | Expired / Lapsed | 1965-11-08 | 1969-01-28 | 0 | Details |
| US3422765A | Superconducting liquid helium pump | Expired / Lapsed | 1967-03-24 | 1969-01-21 | 0 | Details |
| US3423599A | Fuel battery-rechargeable accumulator combination | Expired / Lapsed | 1965-09-20 | 1969-01-21 | 0 | Details |
| US3419634A | Organopolysiloxane polycarbonate block copolymers | Expired / Lapsed | 1966-01-03 | 1968-12-31 | 0 | Details |
| US3418459A | Graphic construction display generator | Expired / Lapsed | 1967-06-16 | 1968-12-24 | 2 | Details |
| US3417235A | System to regulate position of a plurality of objects with … | Expired / Lapsed | 1967-04-04 | 1968-12-17 | 0 | Details |
| US3417322A | Simplified piezoresistive force sensing device | Expired / Lapsed | 1966-06-29 | 1968-12-17 | 0 | Details |
| US3416533A | Conductive catheter | Expired / Lapsed | 1966-05-20 | 1968-12-17 | 0 | Details |
| US3416534A | Body organ electrode | Expired / Lapsed | 1966-04-11 | 1968-12-17 | 0 | Details |
| US3416146A | Content addressed memory system having a grouped selection … | Expired / Lapsed | 1964-12-21 | 1968-12-10 | 0 | Details |
| US3413541A | Apparatus for detecting insulation faults in magnet wire ut… | Expired / Lapsed | 1967-02-24 | 1968-11-26 | 0 | Details |
| US3413007A | Turntable bearing structure | Expired / Lapsed | 1967-01-03 | 1968-11-26 | 0 | Details |
| US3413613A | Reconfigurable data processing system | Expired / Lapsed | 1966-06-17 | 1968-11-26 | 2 | Details |
| US3413055A | Magneto-optic glass body and electric circuit element in re… | Expired / Lapsed | 1961-04-12 | 1968-11-26 | 2 | Details |
| US3413454A | High speed data processing system | Expired / Lapsed | 1958-10-24 | 1968-11-26 | 1 | Details |
| US3411035A | Multi-chamber hollow cathode low voltage electron beam appa… | Expired / Lapsed | 1966-05-31 | 1968-11-12 | 0 | Details |
| US3409880A | Apparatus for processing data records in a computer system | Expired / Lapsed | 1966-05-26 | 1968-11-05 | 2 | Details |
| US3408501A | Photoelectric control device with rotatable housing for adj… | Expired / Lapsed | 1966-04-14 | 1968-10-29 | 2 | Details |
| US3407322A | Infrared camera tube with cooling means for internal elemen… | Expired / Lapsed | 1962-06-25 | 1968-10-22 | 2 | Details |
| US3402972A | Continuous pressure control system | Expired / Lapsed | 1966-08-11 | 1968-09-24 | 0 | Details |
| US3403394A | Diversity radar system | Expired / Lapsed | 1966-07-19 | 1968-09-24 | 0 | Details |
| US3402399A | Word-organized associative cryotron memory | Expired / Lapsed | 1964-12-16 | 1968-09-17 | 0 | Details |
| US3399693A | Fluid diverter check valve | Expired / Lapsed | 1966-06-08 | 1968-09-03 | 2 | Details |
| US3400314A | Numerical positioning control system | Expired / Lapsed | 1965-05-27 | 1968-09-03 | 2 | Details |
| US3399317A | Motion damper | Expired / Lapsed | 1964-04-24 | 1968-08-27 | 0 | Details |
| US3396510A | Liquid membranes for use in the separation of gases | Expired / Lapsed | 1966-08-15 | 1968-08-13 | 0 | Details |
| US3397086A | Photoconductive composition and coated article | Expired / Lapsed | 1965-03-12 | 1968-08-13 | 0 | Details |
| US3396377A | Display data processor | Expired / Lapsed | 1964-06-29 | 1968-08-06 | 0 | Details |
| US3394581A | Vibration measurement, protection, and calibration circuit | Expired / Lapsed | 1966-04-05 | 1968-07-30 | 0 | Details |
| US3395394A | Priority selector | Expired / Lapsed | 1965-10-20 | 1968-07-30 | 0 | Details |
| US3393370A | Multi-geometric pattern electric generator | Expired / Lapsed | 1965-08-04 | 1968-07-16 | 0 | Details |
| US3392143A | Polyamide compositions | Expired / Lapsed | 1967-05-15 | 1968-07-09 | 0 | Details |
| US3392045A | Epoxidized polyolefin-ethylene polymer compositions and lam… | Expired / Lapsed | 1966-01-17 | 1968-07-09 | 0 | Details |
| US3390901A | Quick disconnect flangeless waveguide coupling | Expired / Lapsed | 1967-02-27 | 1968-07-02 | 0 | Details |
| US3391330A | Direct current power supplies with overload protection | Expired / Lapsed | 1965-10-19 | 1968-07-02 | 0 | Details |
| US3389950A | Fiber optics scan system | Expired / Lapsed | 1967-10-18 | 1968-06-25 | 0 | Details |
| US3389383A | Integrated circuit bistable memory cell | Expired / Lapsed | 1967-05-31 | 1968-06-18 | 0 | Details |
| US3384567A | Electrolyte guide member | Expired / Lapsed | 1965-10-22 | 1968-05-21 | 2 | Details |
| US3384719A | Stereophonic speaker arrangement | Expired / Lapsed | 1964-10-21 | 1968-05-21 | 0 | Details |
| US3383977A | Method and apparatus for indicating the aim of projection-t… | Expired / Lapsed | 1963-12-30 | 1968-05-21 | 0 | Details |
| US3382670A | Gas turbine engine lubrication system | Expired / Lapsed | 1966-12-01 | 1968-05-14 | 2 | Details |
| US3381185A | Double heat sink semiconductor diode with glass envelope | Expired / Lapsed | 1967-03-23 | 1968-04-30 | 2 | Details |
| US3381226A | Zero crossing synchronous switching circuits for power semi… | Expired / Lapsed | 1965-05-18 | 1968-04-30 | 1 | Details |
| US3379174A | Apparatus for applying a coating onto a localized region of… | Expired / Lapsed | 1964-04-01 | 1968-04-23 | 0 | Details |
| US3378743A | Current regulator for motor control systems including an op… | Expired / Lapsed | 1965-02-26 | 1968-04-16 | 0 | Details |
| US3378817A | Signalling systems | Expired / Lapsed | 1964-12-09 | 1968-04-16 | 2 | Details |
| US3377622A | High speed printer system including recirculating data and … | Expired / Lapsed | 1965-04-20 | 1968-04-09 | 0 | Details |
| US3377621A | Electronic data processing system with time sharing of memo… | Expired / Lapsed | 1965-04-14 | 1968-04-09 | 0 | Details |
| US3375223A | Method for polymerizing organopolysiloxanes | Expired / Lapsed | 1964-10-01 | 1968-03-26 | 0 | Details |
| US3373482A | Fluxless aluminum brazing | Expired / Lapsed | 1966-09-19 | 1968-03-19 | 2 | Details |
| US3373688A | Pumps | Expired / Lapsed | 1965-07-30 | 1968-03-19 | 0 | Details |
| US3373268A | Process controller having electrochemical cell integrating … | Expired / Lapsed | 1964-02-24 | 1968-03-12 | 0 | Details |
| US3372318A | Semiconductor switches | Expired / Lapsed | 1965-01-22 | 1968-03-05 | 0 | Details |
| US3370676A | Mine hoist system including a main counter for level determ… | Expired / Lapsed | 1964-06-15 | 1968-02-27 | 0 | Details |
| US3370207A | Multilayer contact system for semiconductor devices includi… | Expired / Lapsed | 1964-02-24 | 1968-02-20 | 4 | Details |
| US3369737A | Radial flow machine | Expired / Lapsed | 1962-12-10 | 1968-02-20 | 2 | Details |
| US3367332A | Product and process for establishing a sterile area of skin | Expired / Lapsed | 1965-08-27 | 1968-02-06 | 0 | Details |
| US3368153A | Shaper for producing uniform rectangular pulses from variou… | Expired / Lapsed | 1965-05-26 | 1968-02-06 | 0 | Details |
| US3368205A | Control apparatus in a data processing system | Expired / Lapsed | 1965-04-14 | 1968-02-06 | 0 | Details |
| US3368206A | Information shift apparatus in a data processing system | Expired / Lapsed | 1965-04-14 | 1968-02-06 | 0 | Details |
| US3365584A | Cryo-electronic threshold components | Expired / Lapsed | — | 1968-01-23 | 0 | Details |
| US3365675A | Power amplifier control and protective circuit | Expired / Lapsed | 1965-01-04 | 1968-01-23 | 2 | Details |
| US3365626A | Electrical capacitor | Expired / Lapsed | 1960-10-19 | 1968-01-23 | 2 | Details |
| US3362160A | Gas turbine engine inspection apparatus | Expired / Lapsed | 1966-09-16 | 1968-01-09 | 2 | Details |
| US3359760A | Control for automatic washer | Expired / Lapsed | 1966-11-21 | 1967-12-26 | 2 | Details |
| US3357275A | Power tool | Expired / Lapsed | 1965-06-25 | 1967-12-12 | 2 | Details |
| US3357299A | Total internal reflection projection system | Expired / Lapsed | 1962-09-11 | 1967-12-12 | 2 | Details |
| US3356761A | Melt processable polyphenylene ether and process | Expired / Lapsed | 1967-04-12 | 1967-12-05 | 2 | Details |
| US3353854A | Structural corner assembly | Expired / Lapsed | 1965-04-09 | 1967-11-21 | 2 | Details |
| US3351919A | Data recording and error detection system | Expired / Lapsed | 1965-05-19 | 1967-11-07 | 2 | Details |
| US3351913A | Memory system including means for selectively altering or n… | Expired / Lapsed | 1964-10-21 | 1967-11-07 | 2 | Details |
| US3350944A | Strain gauge pressure transducer | Expired / Lapsed | 1963-10-17 | 1967-11-07 | 2 | Details |
| US3351690A | Heat treating pyrolytic graphite and boron nitride bodies w… | Expired / Lapsed | 1962-04-18 | 1967-11-07 | 2 | Details |
| US3350611A | Gate fired bidirectional switch | Expired / Lapsed | 1965-02-04 | 1967-10-31 | 2 | Details |
| US3350621A | Independently controlled rectifier bridge converter | Expired / Lapsed | 1964-03-25 | 1967-10-31 | 1 | Details |
| US3349229A | Apparatus to permit both contouring and numerical positioni… | Expired / Lapsed | 1963-07-08 | 1967-10-24 | 2 | Details |
| US3347553A | Fluid seal | Expired / Lapsed | 1966-05-23 | 1967-10-17 | 2 | Details |
| US3348116A | Electric knife storage case and battery charger | Expired / Lapsed | 1964-10-02 | 1967-10-17 | 2 | Details |
| US3348128A | Phase controlled alternating current power circuits using b… | Expired / Lapsed | 1964-06-26 | 1967-10-17 | 2 | Details |
| US3346874A | Power control circuits | Expired / Lapsed | 1964-02-07 | 1967-10-10 | 2 | Details |
| US3343036A | Static undervoltage circuit | Expired / Lapsed | 1964-12-17 | 1967-09-19 | 2 | Details |
| US3342195A | Speed and motive fluid pressure control system for steam tu… | Expired / Lapsed | 1964-08-11 | 1967-09-19 | 2 | Details |
| US3340883A | Acceleration, speed and load control system with redundant … | Expired / Lapsed | 1966-04-12 | 1967-09-12 | 2 | Details |
| US3340951A | Speed control system | Expired / Lapsed | 1964-04-24 | 1967-09-12 | 2 | Details |
| US3341489A | Elastomeric organopolysiloxane compositions containing unsa… | Expired / Lapsed | 1962-09-28 | 1967-09-12 | 2 | Details |
| US3337803A | Data transmission system | Expired / Lapsed | 1962-01-09 | 1967-08-22 | 2 | Details |
| US3335716A | Diagnostic thermography method and means | Expired / Lapsed | 1965-01-18 | 1967-08-15 | 2 | Details |
| US3336440A | System for locking an oscillator to a reference frequency h… | Expired / Lapsed | 1964-05-29 | 1967-08-15 | 2 | Details |
| US3335291A | Zero voltage switching circuit using gate controlled conduc… | Expired / Lapsed | 1965-03-11 | 1967-08-08 | 2 | Details |
| US3335349A | Speed detection and control systems incorporating a dc chop… | Expired / Lapsed | 1964-08-17 | 1967-08-08 | 2 | Details |
| US3335413A | Wide band optical recording and narrow band reproduction on… | Expired / Lapsed | 1963-12-19 | 1967-08-08 | 2 | Details |
| US3334334A | Signal change detector for process control computer | Expired / Lapsed | 1963-07-26 | 1967-08-01 | 2 | Details |
| US3333045A | Body implantable electrical conductor | Expired / Lapsed | 1965-07-20 | 1967-07-25 | 2 | Details |
| US3332143A | Semiconductor devices with epitaxial contour | Expired / Lapsed | 1964-12-28 | 1967-07-25 | 2 | Details |
| US3333250A | Buffering system for data communication | Expired / Lapsed | 1964-07-16 | 1967-07-25 | 2 | Details |
| US3332425A | Magnetic endoscope for probing the esophageal, stomachic, a… | Expired / Lapsed | 1964-06-05 | 1967-07-25 | 2 | Details |
| US3330960A | Flame spectrophotometer using ionization current detection | Expired / Lapsed | 1963-10-08 | 1967-07-11 | 2 | Details |
| US3327306A | Optimized input adaptive control method and system | Expired / Lapsed | 1964-12-31 | 1967-06-20 | 1 | Details |
| US3327101A | Automatic control apparatus | Expired / Lapsed | 1962-11-21 | 1967-06-20 | 2 | Details |
| US3325434A | Polytetrafluoroethylene-silicone rubber extrusion compositi… | Expired / Lapsed | 1965-04-27 | 1967-06-13 | 1 | Details |
| US3325750A | High resolution time interval measuring circuit employing a… | Expired / Lapsed | 1963-12-23 | 1967-06-13 | 1 | Details |
| US3325633A | Numerical control system to keep object position within pre… | Expired / Lapsed | 1963-07-24 | 1967-06-13 | 2 | Details |
| US3325325A | Method of making polyethylene insulated electrical conducto… | Expired / Lapsed | 1962-12-17 | 1967-06-13 | 2 | Details |
| US3324447A | Electrical connector | Expired / Lapsed | 1965-05-28 | 1967-06-06 | 2 | Details |
| US3324359A | Four layer semiconductor switch with the third layer defini… | Expired / Lapsed | 1963-09-30 | 1967-06-06 | 2 | Details |
| US3324393A | Magneto-optical electric current sensing arrangement | Expired / Lapsed | 1963-07-26 | 1967-06-06 | 2 | Details |
| US3321828A | Aluminum brazing | Expired / Lapsed | 1962-01-02 | 1967-05-30 | 2 | Details |
| US3321641A | Snap-action trigger circuit for semiconductor switching dev… | Expired / Lapsed | 1964-05-18 | 1967-05-23 | 2 | Details |
| US3321639A | Direct coupled, current mode logic | Expired / Lapsed | 1962-12-03 | 1967-05-23 | 2 | Details |
| US3321746A | Cryogenic associative memory | Expired / Lapsed | 1962-09-27 | 1967-05-23 | 2 | Details |
| US3320532A | Logarithmic micro-microammeter having field effect transist… | Expired / Lapsed | 1963-07-23 | 1967-05-16 | 1 | Details |
| US3317796A | Cooling arrangement for electrical apparatus | Expired / Lapsed | 1964-10-27 | 1967-05-02 | 2 | Details |
| US3317795A | Overcurrent protective means | Expired / Lapsed | 1964-04-21 | 1967-05-02 | 2 | Details |
| US3316130A | Epitaxial growth of semiconductor devices | Expired / Lapsed | 1963-05-07 | 1967-04-25 | 2 | Details |
| US3316392A | Coded automatic identification system | Expired / Lapsed | 1962-11-13 | 1967-04-25 | 2 | Details |
| US3315111A | Flexible electroluminescent device and light transmissive e… | Expired / Lapsed | 1966-06-09 | 1967-04-18 | 4 | Details |
| US3315234A | Data editing apparatus | Expired / Lapsed | 1964-03-02 | 1967-04-18 | 2 | Details |
| US3311303A | Programmer | Expired / Lapsed | 1965-09-28 | 1967-03-28 | 2 | Details |
| US3311111A | Controllable electric body tissue stimulators | Expired / Lapsed | 1964-08-11 | 1967-03-28 | 0 | Details |
| US3311889A | Data communication processor | Expired / Lapsed | 1963-08-13 | 1967-03-28 | 2 | Details |
| US3310785A | Data processing unit for selectively controlling access to … | Expired / Lapsed | 1964-05-04 | 1967-03-21 | 2 | Details |
| US3310388A | Method of joining aluminum and a dissimilar metal and joint… | Expired / Lapsed | 1963-12-23 | 1967-03-21 | 4 | Details |
| US3308279A | Error compensation circuit for control system | Expired / Lapsed | 1965-03-04 | 1967-03-07 | 2 | Details |
| US3308442A | Data processing unit for providing data shift under selecti… | Expired / Lapsed | 1964-05-04 | 1967-03-07 | 2 | Details |
| US3307152A | Data transmission system with control character insertions | Expired / Lapsed | 1963-05-31 | 1967-02-28 | 1 | Details |
| US3306875A | Oxidation of phenols and resulting products | Expired / Lapsed | 1962-07-24 | 1967-02-28 | 4 | Details |
| US3305633A | Laser optical system | Expired / Lapsed | 1963-06-26 | 1967-02-21 | 2 | Details |
| US3304414A | Pulse counting device with visual and electrical storage an… | Expired / Lapsed | 1963-05-31 | 1967-02-14 | 2 | Details |
| US3303432A | High power semiconductor laser devices | Expired / Lapsed | 1966-04-18 | 1967-02-07 | 2 | Details |
| US3303360A | Semiconductor switch | Expired / Lapsed | 1966-01-21 | 1967-02-07 | 2 | Details |
| US3301780A | Preparation of compacted body of improved lubricating agents | Expired / Lapsed | 1964-05-05 | 1967-01-31 | 2 | Details |
| US3300851A | Method of making bonded wire circuits | Expired / Lapsed | 1964-01-02 | 1967-01-31 | 2 | Details |
| US3302174A | Signal position detection circuit | Expired / Lapsed | 1963-07-30 | 1967-01-31 | 2 | Details |
| US3302181A | Digital input-output buffer for computerized systems | Expired / Lapsed | 1963-06-17 | 1967-01-31 | 2 | Details |
| US3299223A | Pushbutton switch assembly with flashover protection delay … | Expired / Lapsed | 1966-04-27 | 1967-01-17 | 2 | Details |
| US3298001A | Data processing unit for providing selective memory address… | Expired / Lapsed | 1964-05-04 | 1967-01-10 | 2 | Details |
| US3296291A | Reaction of silanes with unsaturated olefinic compounds | Expired / Lapsed | 1962-07-02 | 1967-01-03 | 2 | Details |
| US3295029A | Field effect semiconductor device with polar polymer covere… | Expired / Lapsed | 1963-04-03 | 1966-12-27 | 1 | Details |
| US3293449A | Solid state thyratron replacement | Expired / Lapsed | 1963-06-24 | 1966-12-20 | 2 | Details |
| US3292128A | Semiconductor strain sensitive devices | Expired / Lapsed | 1961-12-26 | 1966-12-13 | 2 | Details |
| US3290622A | Microwave ferromagnetic phase shifter having controllable d… | Expired / Lapsed | 1963-11-27 | 1966-12-06 | 2 | Details |
| US3290509A | Electro-optical apparatus and circuit for sensing reflectiv… | Expired / Lapsed | 1963-10-30 | 1966-12-06 | 2 | Details |
| US3290175A | Semiconductor photovoltaic devices | Expired / Lapsed | 1962-07-06 | 1966-12-06 | 4 | Details |
| US3290409A | Preparation of polycarbonate resins | Expired / Lapsed | 1962-03-08 | 1966-12-06 | 2 | Details |
| US3289046A | Component chip mounted on substrate with heater pads thereb… | Expired / Lapsed | 1964-05-19 | 1966-11-29 | 0 | Details |
| US3288927A | Projection system | Expired / Lapsed | 1964-01-02 | 1966-11-29 | 2 | Details |
| US3289082A | Phase shift data transmission system with phase-coherent da… | Expired / Lapsed | 1963-05-31 | 1966-11-29 | 2 | Details |
| US3289070A | Circuitry for obviating the effects caused by subtransient … | Expired / Lapsed | 1963-04-05 | 1966-11-29 | 2 | Details |
| US3286151A | Controlled rectifier current limit for d. c. motor | Expired / Lapsed | 1963-09-20 | 1966-11-15 | 1 | Details |
| US3286232A | Digital comparator classifying device | Expired / Lapsed | 1961-11-03 | 1966-11-15 | 2 | Details |
| US3284688A | D.-c. current regulator including a high gain saturating am… | Expired / Lapsed | 1965-07-27 | 1966-11-08 | 2 | Details |
| US3284123A | Tool for handling small objects | Expired / Lapsed | 1964-09-21 | 1966-11-08 | 2 | Details |
| US3283062A | Terminal enclosure | Expired / Lapsed | 1965-08-31 | 1966-11-01 | 2 | Details |
| US3283294A | Apparatus for an electrohydraulic system | Expired / Lapsed | 1965-03-31 | 1966-11-01 | 2 | Details |
| US3283310A | Thermoplastic film tape recorder | Expired / Lapsed | 1964-11-23 | 1966-11-01 | 2 | Details |
| US3283234A | Control for reversible motor with instantaneous current lim… | Expired / Lapsed | 1964-01-10 | 1966-11-01 | 2 | Details |
| US3280583A | Combination refrigerator | Expired / Lapsed | 1965-05-12 | 1966-10-25 | 2 | Details |
| US3281762A | Composite terminal board with slidable terminals | Expired / Lapsed | 1964-01-06 | 1966-10-25 | 2 | Details |
| US3277355A | Terminal condition predictive control system | Expired / Lapsed | 1963-12-23 | 1966-10-04 | 2 | Details |
| US3277395A | Pluse width modulator | Expired / Lapsed | 1963-11-18 | 1966-10-04 | 2 | Details |
| US3275919A | Recharger contacts for electric toothbrush | Expired / Lapsed | 1963-09-09 | 1966-09-27 | 2 | Details |
| US3274750A | Permeable polymeric membrane gas separation | Expired / Lapsed | 1962-12-28 | 1966-09-27 | 1 | Details |
| US3275907A | Semiconductor device mounting with embedded thermal matchin… | Expired / Lapsed | 1961-04-05 | 1966-09-27 | 2 | Details |
| US3274443A | Redundant speed control system | Expired / Lapsed | 1963-12-05 | 1966-09-20 | 2 | Details |
| US3273018A | Fast action current limiting circuit employing release of s… | Expired / Lapsed | 1964-09-15 | 1966-09-13 | 2 | Details |
| US3273146A | Object identifying apparatus | Expired / Lapsed | 1964-08-07 | 1966-09-13 | 2 | Details |
| US3273017A | Ground fault responsive directional comparison protective s… | Expired / Lapsed | 1963-01-07 | 1966-09-13 | 2 | Details |
| US3273125A | Self-adapting neuron | Expired / Lapsed | 1961-08-22 | 1966-09-13 | 1 | Details |
| US3273046A | Inverter circuits with independent commutation circuits | Expired / Lapsed | 1961-05-08 | 1966-09-13 | 1 | Details |
| US3270254A | Electrical capacitors and method of making the same | Expired / Lapsed | 1962-04-16 | 1966-08-30 | 2 | Details |
| US3270321A | Selective data sampling system | Expired / Lapsed | 1962-02-02 | 1966-08-30 | 2 | Details |
| US3270338A | Identification system | Expired / Lapsed | 1961-03-24 | 1966-08-30 | 2 | Details |
| US3268361A | Thermoplastic recording member | Expired / Lapsed | 1962-11-20 | 1966-08-23 | 2 | Details |
| US3267434A | Information handling system | Expired / Lapsed | 1961-07-05 | 1966-08-16 | 2 | Details |
| US3265200A | Packaging device | Expired / Lapsed | 1964-10-22 | 1966-08-09 | 2 | Details |
| US3265469A | Crystal growing apparatus | Expired / Lapsed | 1964-09-21 | 1966-08-09 | 2 | Details |
| US3265909A | Semiconductor switch comprising a controlled rectifier supp… | Expired / Lapsed | 1963-09-03 | 1966-08-09 | 2 | Details |
| US3265855A | Method and apparatus for drilling small holes | Expired / Lapsed | 1963-04-01 | 1966-08-09 | 2 | Details |
| US3264457A | Hybrid digital-analog nonlinear function generator | Expired / Lapsed | 1962-12-26 | 1966-08-02 | 1 | Details |
| US3264544A | Counter e. m. f. speed control | Expired / Lapsed | 1962-06-08 | 1966-08-02 | 2 | Details |
| US3264633A | Automatic power meter reading over neutral power transmissi… | Expired / Lapsed | 1961-03-22 | 1966-08-02 | 0 | Details |
| US3263125A | Current limiting circuits and apparatus for operating elect… | Expired / Lapsed | 1963-05-01 | 1966-07-26 | 2 | Details |
| US3263066A | Hybrid digital-analog circuit | Expired / Lapsed | 1962-05-31 | 1966-07-26 | 2 | Details |
| US3261990A | Staircase wave generator using silicon controlled rectifiers | Expired / Lapsed | 1964-08-07 | 1966-07-19 | 2 | Details |
| US3261801A | Reversion resistant organopolysiloxane containing barium ox… | Expired / Lapsed | 1962-08-22 | 1966-07-19 | 2 | Details |
| US3260962A | Gated pulse generator with time delay | Expired / Lapsed | 1964-01-02 | 1966-07-12 | 2 | Details |
| US3260969A | Apparatus for producing sonic vibrations at x-band microwav… | Expired / Lapsed | 1963-06-28 | 1966-07-12 | 2 | Details |
| US3258828A | Method of producing a superconductive solenoid disc | Expired / Lapsed | 1965-03-22 | 1966-07-05 | 2 | Details |
| US3258767A | Apparatus for producing sonic vibrations at x-band microwav… | Expired / Lapsed | 1964-11-13 | 1966-06-28 | 1 | Details |
| US3258774A | Series-fed phased array | Expired / Lapsed | 1963-12-30 | 1966-06-28 | 2 | Details |
| US3256675A | Method and apparatus for gas separation by thin films or me… | Expired / Lapsed | 1962-11-30 | 1966-06-21 | 1 | Details |
| US3251222A | Strain sensitive apparatus and elements therefor | Expired / Lapsed | 1961-04-20 | 1966-05-17 | 2 | Details |
| US3250443A | Dispensing cartridge plunger | Expired / Lapsed | 1964-12-21 | 1966-05-10 | 2 | Details |
| US3251015A | Miniature magnetic core and component assemblies | Expired / Lapsed | 1964-05-20 | 1966-05-10 | 1 | Details |
| US3248758A | Mold for the manufacture of polyurethane foam articles | Expired / Lapsed | 1964-05-15 | 1966-05-03 | 0 | Details |
| US3249807A | Control circuit using parallel control rectifiers | Expired / Lapsed | 1962-09-13 | 1966-05-03 | 2 | Details |
| US3248622A | Position control system utilizing a coarse analog compariso… | Expired / Lapsed | 1961-09-05 | 1966-04-26 | 2 | Details |
| US3247422A | Transistor inverter ballasting circuit | Expired / Lapsed | 1961-06-01 | 1966-04-19 | 2 | Details |
| US3244174A | Body implantable conductor | Expired / Lapsed | 1964-01-31 | 1966-04-05 | 0 | Details |
| US3245002A | Stimulated emission semiconductor devices | Expired / Lapsed | 1962-10-24 | 1966-04-05 | 2 | Details |
| US3243620A | Synchronous induction motors having an improved rotor const… | Expired / Lapsed | 1963-05-01 | 1966-03-29 | 1 | Details |
| US3242643A | Method and apparatus for degasifying epoxy resin | Expired / Lapsed | 1963-03-04 | 1966-03-29 | 2 | Details |
| US3243602A | Silicon controlled gate turn off switch circuit with load c… | Expired / Lapsed | 1962-12-13 | 1966-03-29 | 1 | Details |
| US3243404A | Silyl amine processing aids for polysiloxane elastomers | Expired / Lapsed | 1962-04-02 | 1966-03-29 | 2 | Details |
| US3241124A | Ranking matrix | Expired / Lapsed | 1961-07-25 | 1966-03-15 | 2 | Details |
| US3239728A | Semiconductor switch | Expired / Lapsed | 1962-07-17 | 1966-03-08 | 2 | Details |
| US3239819A | Data processing system including priority feature for plura… | Expired / Lapsed | 1962-05-01 | 1966-03-08 | 2 | Details |
| US3238839A | Optical thickness gauge | Expired / Lapsed | 1962-03-29 | 1966-03-08 | 2 | Details |
| US3239322A | Process for sealing vacuum-tight spinel bodies | Expired / Lapsed | 1961-05-24 | 1966-03-08 | 2 | Details |
| US3236204A | Channel indicator window assembly | Expired / Lapsed | 1963-06-18 | 1966-02-22 | 2 | Details |
| US3237160A | Semiconductor multiple-word correlator | Expired / Lapsed | 1962-07-31 | 1966-02-22 | 2 | Details |
| US3235879A | Buffer apparatus for providing data transfer with the memor… | Expired / Lapsed | 1960-02-15 | 1966-02-15 | 2 | Details |
| US3235844A | Adaptive system | Expired / Lapsed | 1960-02-08 | 1966-02-15 | 2 | Details |
| US3234099A | Method of preparing a gamma radiation material | Expired / Lapsed | 1963-02-06 | 1966-02-08 | 2 | Details |
| US3234458A | Method for determining resistivity of a metal | Expired / Lapsed | 1960-11-28 | 1966-02-08 | 2 | Details |
| US3233168A | Control system for voltage regulator | Expired / Lapsed | 1962-04-06 | 1966-02-01 | 1 | Details |
| US3230362A | Bakeable mass spectrometer with means to precisely align th… | Expired / Lapsed | 1963-12-03 | 1966-01-18 | 0 | Details |
| US3230097A | Coating composition | Expired / Lapsed | 1962-05-31 | 1966-01-18 | 2 | Details |
| US3229182A | Armature voltage sensing and indicating circuit | Expired / Lapsed | 1962-03-07 | 1966-01-11 | 0 | Details |
| US3227972A | Apparatus in which phonon energy is efficiently generated b… | Expired / Lapsed | 1964-04-17 | 1966-01-04 | 2 | Details |
| US3227777A | Vulcanizing ethylene-propylene copolymers with an alkenylpo… | Expired / Lapsed | 1963-01-24 | 1966-01-04 | 2 | Details |
| US3227397A | Roll rate stabilization system for outer space vehicle | Expired / Lapsed | 1959-11-30 | 1966-01-04 | 1 | Details |
| US3225334A | Data processing system including plural peripheral devices … | Expired / Lapsed | 1962-05-01 | 1965-12-21 | 2 | Details |
| US3223830A | Position indicating device | Expired / Lapsed | 1963-03-14 | 1965-12-14 | 2 | Details |
| US3223225A | Collision prevention system | Expired / Lapsed | 1962-09-25 | 1965-12-14 | 2 | Details |
| US3223940A | Redundant signal amplifier transmission channel | Expired / Lapsed | 1962-06-29 | 1965-12-14 | 2 | Details |
| US3222644A | Simplified error-control decoder | Expired / Lapsed | 1962-07-26 | 1965-12-07 | 2 | Details |
| US3222583A | Control systems | Expired / Lapsed | 1962-03-23 | 1965-12-07 | 2 | Details |
| US3221132A | Non-resonant oven cavity and resonant antenna system for mi… | Expired / Lapsed | 1963-07-22 | 1965-11-30 | 2 | Details |
| US3220972A | Organosilicon process using a chloroplatinic acid reaction … | Expired / Lapsed | 1962-07-02 | 1965-11-30 | 3 | Details |
| US3221317A | Audible indicator circuit | Expired / Lapsed | 1962-06-27 | 1965-11-30 | 2 | Details |
| US3218758A | Photosynthetic apparatus | Expired / Lapsed | 1962-12-20 | 1965-11-23 | 1 | Details |
| US3217470A | Air purifier construction | Expired / Lapsed | 1963-09-03 | 1965-11-16 | 2 | Details |
| US3218559A | Synchronizing circuit maintaining loop signals as an intege… | Expired / Lapsed | 1961-11-09 | 1965-11-16 | 2 | Details |
| US3216227A | Clothes washing machines | Expired / Lapsed | 1963-10-08 | 1965-11-09 | 2 | Details |
| US3214708A | Frequency-type telemeter transmitter | Expired / Lapsed | 1962-03-28 | 1965-10-26 | 2 | Details |
| US3212741A | Mounting devices for busway | Expired / Lapsed | 1964-08-27 | 1965-10-19 | 2 | Details |
| US3213450A | Undesired signal canceller | Expired / Lapsed | 1962-12-21 | 1965-10-19 | 1 | Details |
| US3212401A | Inhomogeneous magnesia-alumina optical lens | Expired / Lapsed | 1962-10-03 | 1965-10-19 | 2 | Details |
| US3210665A | Mobile radio with timing circuit for automatically energizi… | Expired / Lapsed | 1962-12-31 | 1965-10-05 | 2 | Details |
| US3209350A | Identification interrogation system | Expired / Lapsed | 1963-10-04 | 1965-09-28 | 2 | Details |
| US3208683A | Automatic control systems for rolling mills | Expired / Lapsed | 1962-12-03 | 1965-09-28 | 2 | Details |
| US3209258A | Radio communication system | Expired / Lapsed | 1961-05-22 | 1965-09-28 | 1 | Details |
| US3207974A | Inverter circuits | Expired / Lapsed | 1961-02-23 | 1965-09-21 | 2 | Details |
| US3206331A | Method for coating articles with pyrolitic graphite | Expired / Lapsed | 1961-04-25 | 1965-09-14 | 2 | Details |
| US3204950A | Halted object detector | Expired / Lapsed | 1963-04-09 | 1965-09-07 | 2 | Details |
| US3205355A | Moisture gage standards | Expired / Lapsed | 1963-03-21 | 1965-09-07 | 2 | Details |
| US3204440A | Automatic zeroing for a rolling mill position regulator | Expired / Lapsed | 1963-03-01 | 1965-09-07 | 2 | Details |
| US3205501A | Closely spaced stocked waveguide antenna array employing re… | Expired / Lapsed | 1959-10-01 | 1965-09-07 | 1 | Details |
| US3199293A | Two shaft gas turbine control system | Expired / Lapsed | 1963-08-15 | 1965-08-10 | 2 | Details |
| US3200226A | Electrical contact member having a raised cup shaped work-h… | Expired / Lapsed | 1963-01-02 | 1965-08-10 | 1 | Details |
| US3198991A | Air cooled electronic enclosure | Expired / Lapsed | 1964-02-26 | 1965-08-03 | 2 | Details |
| US3197776A | Receiver-indicator system for radar apparatus | Expired / Lapsed | 1952-09-11 | 1965-07-27 | 2 | Details |
| US3196262A | Binary comparator | Expired / Lapsed | 1961-12-14 | 1965-07-20 | 1 | Details |
| US3193633A | Racking mechanism including a differential pulley system | Expired / Lapsed | 1962-07-02 | 1965-07-06 | 2 | Details |
| US3193812A | Missing bit detector on recorded storage media | Expired / Lapsed | 1961-05-16 | 1965-07-06 | 2 | Details |
| US3191003A | Surface heating unit | Expired / Lapsed | 1961-12-21 | 1965-06-22 | 1 | Details |
| US3189662A | Organopolysiloxane-polycarbonate block copolymers | Expired / Lapsed | 1961-01-23 | 1965-06-15 | 2 | Details |
| US3188518A | Undulating beam traveling wave tube focusing structure | Expired / Lapsed | 1961-09-26 | 1965-06-08 | 2 | Details |
| US3188537A | Device for asymmetric conduct of current | Expired / Lapsed | 1961-08-31 | 1965-06-08 | 1 | Details |
| US3186835A | High density germanium | Expired / Lapsed | 1962-07-30 | 1965-06-01 | 2 | Details |
| US3186228A | Time-temperature integrator | Expired / Lapsed | 1960-06-30 | 1965-06-01 | 2 | Details |
| US3184734A | Digital-to-analog converter | Expired / Lapsed | 1962-06-25 | 1965-05-18 | 1 | Details |
| US3181933A | Radioactive diamond and process for the preparation thereof | Expired / Lapsed | 1961-02-28 | 1965-05-04 | 2 | Details |
| US3178628A | Motor control circuits | Expired / Lapsed | 1962-04-12 | 1965-04-13 | 2 | Details |
| US3178522A | Rocker-type switch with integral spring and c-shaped contac… | Expired / Lapsed | 1962-03-14 | 1965-04-13 | 2 | Details |
| US3178582A | Waveshape recognition system | Expired / Lapsed | 1961-11-10 | 1965-04-13 | 1 | Details |
| US3176914A | Hermetically sealed compressor unit | Expired / Lapsed | 1963-08-27 | 1965-04-06 | 2 | Details |
| US3177178A | Process for making organopolysiloxanes | Expired / Lapsed | 1962-12-24 | 1965-04-06 | 2 | Details |
| US3177418A | Armature current limiting speed control systems for electri… | Expired / Lapsed | 1962-10-18 | 1965-04-06 | 2 | Details |
| US3177417A | Motor control system responsive to armature c. e. m. f. | Expired / Lapsed | 1962-09-17 | 1965-04-06 | 2 | Details |
| US3177321A | Condition responsive electric switch mechanism | Expired / Lapsed | 1962-03-29 | 1965-04-06 | 2 | Details |
| US3177350A | Transistorized step multiplier | Expired / Lapsed | 1961-05-31 | 1965-04-06 | 1 | Details |
| US3176097A | Pushbutton magnetic switch with a memory | Expired / Lapsed | 1963-07-01 | 1965-03-30 | 0 | Details |
| US3175995A | Preparation of organopolysiloxanes by siloxane rearrangement | Expired / Lapsed | 1962-04-06 | 1965-03-30 | 2 | Details |
| US3176190A | Phase-comparison protective relaying system | Expired / Lapsed | 1960-12-16 | 1965-03-30 | 2 | Details |
| US3176212A | Direct current power supplies | Expired / Lapsed | 1958-12-19 | 1965-03-30 | 2 | Details |
| US3174541A | Air conditioning unit | Expired / Lapsed | 1963-07-12 | 1965-03-23 | 2 | Details |
| US3174367A | Control system | Expired / Lapsed | 1962-07-31 | 1965-03-23 | 1 | Details |
| US3174032A | Adapting quantized filter | Expired / Lapsed | 1960-10-06 | 1965-03-16 | 1 | Details |
| US3173000A | System for synchronizing punched card readers | Expired / Lapsed | 1962-02-21 | 1965-03-09 | 2 | Details |
| US3173001A | Automatic control apparatus | Expired / Lapsed | 1961-09-05 | 1965-03-09 | 2 | Details |
| US3171920A | Motor operating mechanism for use with an electric circuit … | Expired / Lapsed | 1962-11-08 | 1965-03-02 | 2 | Details |
| US3172091A | Digital tachometer | Expired / Lapsed | 1961-05-12 | 1965-03-02 | 2 | Details |
| US3169242A | Identification interrogating system | Expired / Lapsed | 1963-03-19 | 1965-02-09 | 2 | Details |
| US3167748A | Cryotron memory | Expired / Lapsed | 1962-07-05 | 1965-01-26 | 1 | Details |
| US3167662A | High-speed transistor flip-flops | Expired / Lapsed | 1962-02-02 | 1965-01-26 | 2 | Details |
| US3167449A | Method of forming carbon coating | Expired / Lapsed | 1961-04-26 | 1965-01-26 | 2 | Details |
| US3165741A | Phase stable multi-channel pulse compression radar systems | Expired / Lapsed | 1961-12-29 | 1965-01-12 | 1 | Details |
| US3164909A | Automatic gauging system | Expired / Lapsed | 1959-01-14 | 1965-01-12 | 1 | Details |
| US3164804A | Simplified two-stage error-control decoder | Expired / Lapsed | 1962-07-31 | 1965-01-05 | 1 | Details |
| US3164696A | Vane operated magnetic reed switch | Expired / Lapsed | 1961-08-04 | 1965-01-05 | 2 | Details |
| US3164771A | Apparatus for central recording of remote meter data by per… | Expired / Lapsed | 1960-12-08 | 1965-01-05 | 2 | Details |
| US3164807A | Function generator | Expired / Lapsed | 1959-12-31 | 1965-01-05 | 0 | Details |
| US3163758A | Automatic character reader utilizing infrared radiation | Expired / Lapsed | 1961-03-13 | 1964-12-29 | 2 | Details |
| US3162764A | Space vehicle attitude control | Expired / Lapsed | 1961-01-03 | 1964-12-22 | 1 | Details |
| US3161365A | Uncoiler control system | Expired / Lapsed | 1962-02-23 | 1964-12-15 | 2 | Details |
| US3161857A | Electronic data processor | Expired / Lapsed | 1960-12-16 | 1964-12-15 | 2 | Details |
| US3161855A | Electronic data processor | Expired / Lapsed | 1960-12-09 | 1964-12-15 | 1 | Details |
| US3161615A | Resinous copolymeric polycarbonate of a mixture of dihydric… | Expired / Lapsed | 1957-02-05 | 1964-12-15 | 0 | Details |
| US3160280A | Device for mounting apparatus | Expired / Lapsed | 1963-08-12 | 1964-12-08 | 2 | Details |
| US3159980A | Refrigerator including combination evaporator fan motor and… | Expired / Lapsed | 1963-07-17 | 1964-12-08 | 2 | Details |
| US3160602A | Process of producing aromatic polyesters | Expired / Lapsed | 1960-06-01 | 1964-12-08 | 2 | Details |
| US3159662A | Addition reaction | Expired / Lapsed | 1962-07-02 | 1964-12-01 | 2 | Details |
| US3159601A | Platinum-olefin complex catalyzed addition of hydrogen- and… | Expired / Lapsed | 1962-07-02 | 1964-12-01 | 2 | Details |
| US3159777A | Direct current motor | Expired / Lapsed | 1961-12-15 | 1964-12-01 | 2 | Details |
| US3159816A | Central to remote interrogation system | Expired / Lapsed | 1961-05-31 | 1964-12-01 | 2 | Details |
| US3158786A | Overcurrent protection device | Expired / Lapsed | 1962-06-26 | 1964-11-24 | 2 | Details |
| US3158744A | Flaw detection apparatus using two detectors to assure unba… | Expired / Lapsed | 1961-04-21 | 1964-11-24 | 2 | Details |
| US3158799A | Firing circuit for controlled rectifiers | Expired / Lapsed | 1960-01-18 | 1964-11-24 | 2 | Details |
| US3157622A | Resinous compositions | Expired / Lapsed | 1961-01-03 | 1964-11-17 | 2 | Details |
| US3156804A | Slidable switch mechanism for an electric toothbrush | Expired / Lapsed | 1962-05-31 | 1964-11-10 | 2 | Details |
| US3155683A | Preparation of aromatic cyclic carbonates | Expired / Lapsed | 1963-06-03 | 1964-11-03 | 2 | Details |
| US3155777A | Balanced static switching circuits | Expired / Lapsed | 1961-06-29 | 1964-11-03 | 1 | Details |
| US3155879A | Tripping arrangement for an electric circuit breaker | Expired / Lapsed | 1960-12-07 | 1964-11-03 | 2 | Details |
| US3152297A | Frequency converter | Expired / Lapsed | 1961-08-07 | 1964-10-06 | 2 | Details |
| US3150904A | Anti-tip device | Expired / Lapsed | 1963-03-18 | 1964-09-29 | 2 | Details |
| US3150905A | Anti-tip device | Expired / Lapsed | 1963-03-18 | 1964-09-29 | 2 | Details |
| US3151295A | Communication system employing means for adjusting the powe… | Expired / Lapsed | 1960-12-08 | 1964-09-29 | 1 | Details |
| US3150307A | Solid state controlled rectifier circuits and apparatus | Expired / Lapsed | 1962-09-17 | 1964-09-22 | 0 | Details |
| US3150264A | Infrared reflection and absorption system for measuring the… | Expired / Lapsed | 1961-10-09 | 1964-09-22 | 1 | Details |
| US3148169A | Curable polyethylene composition comprising a peroxide cont… | Expired / Lapsed | 1960-12-01 | 1964-09-08 | 2 | Details |
| US3147343A | Signal recognition system | Expired / Lapsed | 1961-06-15 | 1964-09-01 | 2 | Details |
| US3147191A | Nuclear reactor fuel | Expired / Lapsed | 1961-01-25 | 1964-09-01 | 2 | Details |
| US3147477A | Speed measuring system | Expired / Lapsed | 1957-12-26 | 1964-09-01 | 1 | Details |
| US3146392A | Control circuits employing unijunction transistors for firi… | Expired / Lapsed | 1961-08-02 | 1964-08-25 | 2 | Details |
| US3144638A | Time compression storage circuit | Expired / Lapsed | 1960-12-29 | 1964-08-11 | 1 | Details |
| US3142976A | Automatic washing machine with improved cycle selection mea… | Expired / Lapsed | 1963-05-22 | 1964-08-04 | 2 | Details |
| US3143697A | Toothbrush storage case and battery charger | Expired / Lapsed | 1962-05-31 | 1964-08-04 | 1 | Details |
| US3142852A | Automatic toothbrush | Expired / Lapsed | 1962-05-31 | 1964-08-04 | 2 | Details |
| US3143435A | Round panel lamp phosphor coating | Expired / Lapsed | 1962-01-05 | 1964-08-04 | 2 | Details |
| US3143738A | Method for making a collimator for an X-ray beam | Expired / Lapsed | 1960-05-31 | 1964-08-04 | 2 | Details |
| US3143484A | Method of making plated circuit boards | Expired / Lapsed | 1959-12-29 | 1964-08-04 | 2 | Details |
| US3142655A | Organopolysiloxane compositions incorporating heat-age resi… | Expired / Lapsed | 1960-03-23 | 1964-07-28 | 2 | Details |
| US3141384A | Hydraulic reciprocating device | Expired / Lapsed | 1962-12-03 | 1964-07-21 | 2 | Details |
| US3141855A | Method for and product produced by the introduction of boro… | Expired / Lapsed | 1961-08-31 | 1964-07-21 | 2 | Details |
| US3141802A | Semiconducting cubic boron nitride and methods for preparin… | Expired / Lapsed | 1961-05-19 | 1964-07-21 | 2 | Details |
| US3141057A | Non-contacting measuring apparatus | Expired / Lapsed | 1961-02-15 | 1964-07-14 | 2 | Details |
| US3140299A | Derivatives of trimellitic acid anhydrides | Expired / Lapsed | 1962-04-27 | 1964-07-07 | 2 | Details |
| CA689718A | Electroluminescent and photo-voltaic devices | Expired / Lapsed | — | 1964-06-30 | 0 | Details |
| US3139539A | Control circuit producing output signal so long as input pu… | Expired / Lapsed | 1962-03-30 | 1964-06-30 | 2 | Details |
| US3138177A | Flow control device | Expired / Lapsed | 1961-09-06 | 1964-06-23 | 2 | Details |
| US3138435A | Deposition apparatus and method for forming a pyrolytic gra… | Expired / Lapsed | 1961-06-26 | 1964-06-23 | 4 | Details |
| US3138434A | Deposition method of forming a pyrolytic graphite article | Expired / Lapsed | 1961-04-26 | 1964-06-23 | 2 | Details |
| US3138488A | Fuel cell | Expired / Lapsed | 1961-03-08 | 1964-06-23 | 1 | Details |
| US3138686A | Thermal switch device | Expired / Lapsed | 1961-02-01 | 1964-06-23 | 2 | Details |
| US3136650A | Method for coating a surface of an article with a resin lay… | Expired / Lapsed | 1961-11-01 | 1964-06-09 | 1 | Details |
| US3136183A | Slowdown control for reversing hot mill | Expired / Lapsed | 1961-08-29 | 1964-06-09 | 2 | Details |
| US3134949A | Negative resistance frequency modulated oscillator | Expired / Lapsed | 1960-01-08 | 1964-05-26 | 2 | Details |
| US3134697A | Fuel cell | Expired / Lapsed | 1959-11-03 | 1964-05-26 | 2 | Details |
| US3133209A | Switching circuit utilizing two silicon controlled rectifie… | Expired / Lapsed | 1962-05-14 | 1964-05-12 | 2 | Details |
| US3132408A | Method of making semiconductor strain sensitive devices | Expired / Lapsed | 1962-01-18 | 1964-05-12 | 2 | Details |
| US3132294A | Motor commutator utilizing controlled rectifiers | Expired / Lapsed | 1961-05-29 | 1964-05-05 | 1 | Details |
| US3132325A | Electro-optical shift register | Expired / Lapsed | 1959-09-24 | 1964-05-05 | 2 | Details |
| US3130341A | Rapid response semiconductors | Expired / Lapsed | 1960-05-27 | 1964-04-21 | 2 | Details |
| US3129381A | Magnetic amplifier with shunt-load and amplitude controlled… | Expired / Lapsed | 1960-02-04 | 1964-04-14 | 2 | Details |
| US3127641A | Tungsten tube manufacture | Expired / Lapsed | 1961-10-05 | 1964-04-07 | 2 | Details |
| US3128396A | Lock out control circuit for power amplifier | Expired / Lapsed | 1961-09-25 | 1964-04-07 | 1 | Details |
| US3127607A | Method and apparatus for recording of radar signals | Expired / Lapsed | 1960-09-29 | 1964-03-31 | 2 | Details |
| US3122062A | Arc discharge controlled fluid amplifier | Expired / Lapsed | 1962-01-23 | 1964-02-25 | 1 | Details |
| US3121216A | Quick access reference data file | Expired / Lapsed | 1959-06-25 | 1964-02-11 | 2 | Details |
| US3120450A | Method for depositing carbon coatings on high temperature m… | Expired / Lapsed | 1963-08-19 | 1964-02-04 | 2 | Details |
| US3120634A | Controlled rectifier inverter circuit | Expired / Lapsed | 1960-02-01 | 1964-02-04 | 1 | Details |
| US3120633A | Series inverter circuit having controlled rectifiers with p… | Expired / Lapsed | 1960-02-01 | 1964-02-04 | 2 | Details |
| US3118468A | Resilient material check valve | Expired / Lapsed | 1961-04-20 | 1964-01-21 | 2 | Details |
| US3117203A | Circuit protective devices and circuits | Expired / Lapsed | 1960-05-17 | 1964-01-07 | 1 | Details |
| US3117221A | Electrical power computer apparatus | Expired / Lapsed | 1959-04-30 | 1964-01-07 | 2 | Details |
| US3116191A | Method of making storage electrode structure | Expired / Lapsed | 1961-07-12 | 1963-12-31 | 2 | Details |
| US3115352A | Alignment compensating coupling | Expired / Lapsed | 1960-07-20 | 1963-12-24 | 0 | Details |
| US3114872A | Constant current source | Expired / Lapsed | 1961-12-29 | 1963-12-17 | 2 | Details |
| US3114900A | Automatic incremental metering | Expired / Lapsed | 1960-12-08 | 1963-12-17 | 2 | Details |
| US3114884A | Adaptive filter | Expired / Lapsed | 1960-02-08 | 1963-12-17 | 2 | Details |
| US3114046A | Position measuring system | Expired / Lapsed | 1960-08-01 | 1963-12-10 | 2 | Details |
| US3112619A | Refrigerator including defrost control means | Expired / Lapsed | 1962-04-18 | 1963-12-03 | 1 | Details |
| US3113179A | Method and apparatus for recording | Expired / Lapsed | 1960-02-15 | 1963-12-03 | 2 | Details |
| US3111010A | Air conditioning control apparatus | Expired / Lapsed | 1962-09-06 | 1963-11-19 | 2 | Details |
| US3111032A | Temperature measurement system | Expired / Lapsed | 1961-12-07 | 1963-11-19 | 2 | Details |
| US3111166A | Portable heating and cooling appliance | Expired / Lapsed | 1961-04-13 | 1963-11-19 | 2 | Details |
| US3111396A | Method of making a porous material | Expired / Lapsed | 1960-12-14 | 1963-11-19 | 2 | Details |
| US3111645A | Waveform recognition system | Expired / Lapsed | 1959-05-01 | 1963-11-19 | 2 | Details |
| US3109461A | Hose structure | Expired / Lapsed | 1960-12-06 | 1963-11-05 | 2 | Details |
| US3109931A | Method and apparatus for uniformly irradiating an object wi… | Expired / Lapsed | 1960-06-20 | 1963-11-05 | 4 | Details |
| US3109991A | Audio limiter for phase modulation circuits | Expired / Lapsed | 1955-12-15 | 1963-11-05 | 2 | Details |
| US3107180A | Process for deposition of pyrolytic graphite | Expired / Lapsed | 1961-01-26 | 1963-10-15 | 2 | Details |
| US3104330A | Clock pulse distribution system for synchronously driving a… | Expired / Lapsed | 1960-02-11 | 1963-09-17 | 2 | Details |
| US3103648A | Adaptive neuron having improved output | Expired / Lapsed | 1961-08-22 | 1963-09-10 | 2 | Details |
| US3103661A | Impulse systems | Expired / Lapsed | 1941-06-27 | 1963-09-10 | 2 | Details |
| US3100268A | Sympathetic silicon controlled rectifier circuit | Expired / Lapsed | 1960-08-23 | 1963-08-06 | 2 | Details |
| US3099707A | Stereophonic system | Expired / Lapsed | 1960-10-31 | 1963-07-30 | 1 | Details |
| US3098949A | Controlled rectifier d. c. switching circuit | Expired / Lapsed | 1960-05-20 | 1963-07-23 | 2 | Details |
| US3098189A | Cryogenic d. c. to a. c. amplifier | Expired / Lapsed | 1960-04-11 | 1963-07-16 | 2 | Details |
| US3098215A | Data storage and transmission system | Expired / Lapsed | 1957-12-27 | 1963-07-16 | 1 | Details |
| US3095534A | Circuit for controlling energization of a direct current lo… | Expired / Lapsed | 1960-11-22 | 1963-06-25 | 2 | Details |
| US3095324A | Method for making electrically conducting films and article | Expired / Lapsed | 1960-04-14 | 1963-06-25 | 2 | Details |
| US3094647A | Circuit protection means | Expired / Lapsed | 1961-06-30 | 1963-06-18 | 2 | Details |
| US3093399A | Wheel slip suppression system | Expired / Lapsed | 1961-03-06 | 1963-06-11 | 1 | Details |
| US3093768A | Electric lamp base end structure | Expired / Lapsed | 1961-02-01 | 1963-06-11 | 1 | Details |
| US3092732A | Maximum signal identifying circuit | Expired / Lapsed | 1959-05-01 | 1963-06-04 | 2 | Details |
| US3091028A | Method and alloy for bonding to nonmetallic refractory memb… | Expired / Lapsed | 1960-09-02 | 1963-05-28 | 4 | Details |
| US3088065A | Self-regulated static frequency converter | Expired / Lapsed | 1958-09-12 | 1963-04-30 | 2 | Details |
| US3085431A | Flow measuring apparatus | Expired / Lapsed | 1959-12-28 | 1963-04-16 | 2 | Details |
| US3086121A | Photosensitive code reading system | Expired / Lapsed | 1959-10-27 | 1963-04-16 | 1 | Details |
| US3085680A | Filter paper package and method of packaging filter paper | Expired / Lapsed | 1958-09-23 | 1963-04-16 | 1 | Details |
| US3086184A | Coil structure for electromagnetic induction apparatus | Expired / Lapsed | 1957-03-26 | 1963-04-16 | 0 | Details |
| FR1324170A | Improvements in semiconductor devices and their fabrication | Expired / Lapsed | 1962-06-05 | 1963-04-12 | 0 | Details |
| US3084964A | Column brace and clamp assembly | Expired / Lapsed | 1961-01-24 | 1963-04-09 | 0 | Details |
| US3084286A | Binary counter | Expired / Lapsed | 1960-07-20 | 1963-04-02 | 2 | Details |
| US3083123A | Magnesia alumina spinel articles and process of preparing s… | Expired / Lapsed | 1960-06-01 | 1963-03-26 | 2 | Details |
| US3083319A | Temperature responsive system | Expired / Lapsed | 1959-12-24 | 1963-03-26 | 1 | Details |
| US3078232A | Process for making conducting cubic boron nitride and produ… | Expired / Lapsed | 1960-01-18 | 1963-02-19 | 2 | Details |
| US3076924A | Magnetic voltage stabilizer employing controlled silicon re… | Expired / Lapsed | 1960-02-04 | 1963-02-05 | 2 | Details |
| US3072938A | Power operated toothbrush | Expired / Lapsed | 1961-09-07 | 1963-01-15 | 2 | Details |
| US3073269A | Metallic brazing mixture | Expired / Lapsed | 1957-12-24 | 1963-01-15 | 2 | Details |
| US3070227A | Conveyor control system | Expired / Lapsed | 1960-06-14 | 1962-12-25 | 0 | Details |
| US3070739A | Control system for solid state controlled rectifier | Expired / Lapsed | 1960-05-23 | 1962-12-25 | 0 | Details |
| US3069909A | Temperature reference block | Expired / Lapsed | 1959-05-11 | 1962-12-25 | 0 | Details |
| US3065391A | Semiconductor devices | Expired / Lapsed | 1961-01-23 | 1962-11-20 | 0 | Details |
| US3064665A | Dishwashing apparatus | Expired / Lapsed | 1960-12-01 | 1962-11-20 | 0 | Details |
| US3064766A | Spring lock for x-ray apparatus | Expired / Lapsed | 1960-11-30 | 1962-11-20 | 0 | Details |
| US3064174A | Motor speed control circuits | Expired / Lapsed | 1961-05-18 | 1962-11-13 | 0 | Details |
| US3063872A | Recording medium and polysiloxane and resin mixture therefor | Expired / Lapsed | 1960-02-15 | 1962-11-13 | 2 | Details |
| US3063331A | Projection system | Expired / Lapsed | 1959-03-02 | 1962-11-13 | 0 | Details |
| US3063311A | Control system | Expired / Lapsed | 1957-12-16 | 1962-11-13 | 0 | Details |
| US3061658A | Fuel cell construction | Expired / Lapsed | 1959-12-31 | 1962-10-30 | 2 | Details |
| US3060053A | Method and apparatus for accreting molten copper on a movin… | Expired / Lapsed | 1960-09-12 | 1962-10-23 | 2 | Details |
| US3060380A | Sideband detector circuit | Expired / Lapsed | 1958-02-03 | 1962-10-23 | 0 | Details |
| US3055203A | Automatic washer-dryer including a pre-spin impulse speed a… | Expired / Lapsed | 1959-10-01 | 1962-09-25 | 0 | Details |
| US3054966A | Crystal controlled oscillator with temperature compensating… | Expired / Lapsed | 1959-07-15 | 1962-09-18 | 0 | Details |
| US3053543A | Sealing means | Expired / Lapsed | 1960-12-12 | 1962-09-11 | 0 | Details |
| US3052967A | Porous metallic material and method | Expired / Lapsed | 1959-09-14 | 1962-09-11 | 2 | Details |
| US3051813A | Temperature control systems | Expired / Lapsed | 1960-08-24 | 1962-08-28 | 0 | Details |
| US3051535A | Dry lubricant ball-type bearing with non-rotating balls | Expired / Lapsed | 1959-11-20 | 1962-08-28 | 0 | Details |
| US3050865A | Control system for clothes dryers | Expired / Lapsed | 1959-07-09 | 1962-08-28 | 0 | Details |
| US3050611A | Temperature control systems | Expired / Lapsed | 1961-01-03 | 1962-08-21 | 0 | Details |
| US3046772A | Washing machine drive system | Expired / Lapsed | 1960-02-29 | 1962-07-31 | 0 | Details |
| US3047755A | Synchronous reluctance rotor | Expired / Lapsed | 1960-01-15 | 1962-07-31 | 0 | Details |
| US3047789A | Inverter circuit | Expired / Lapsed | 1959-11-25 | 1962-07-31 | 0 | Details |
| US3047718A | Negative ion generator | Expired / Lapsed | 1959-11-24 | 1962-07-31 | 0 | Details |
| US3046464A | Unsymmetrical stabilization | Expired / Lapsed | 1960-01-06 | 1962-07-24 | 0 | Details |
| US3044358A | Color projection system | Expired / Lapsed | 1958-12-24 | 1962-07-17 | 0 | Details |
| US3045174A | Push-pull magnetic amplifier having transistor switches | Expired / Lapsed | 1958-03-27 | 1962-07-17 | 0 | Details |
| US3042807A | Bistable electro-optical network | Expired / Lapsed | 1961-01-19 | 1962-07-03 | 0 | Details |
| US3042838A | Direct current static electric switch | Expired / Lapsed | 1960-12-16 | 1962-07-03 | 0 | Details |
| US3042900A | Shift registers | Expired / Lapsed | 1959-10-29 | 1962-07-03 | 0 | Details |
| US3042741A | Electric circuit board | Expired / Lapsed | 1959-05-29 | 1962-07-03 | 0 | Details |
| US3042917A | Antenna tracking system | Expired / Lapsed | 1958-12-22 | 1962-07-03 | 0 | Details |
| US3042428A | Copper-aluminum tubular connector | Expired / Lapsed | 1954-04-05 | 1962-07-03 | 0 | Details |
| US3040543A | Air conditioning unit having low fan speed over-ride means | Expired / Lapsed | 1960-12-22 | 1962-06-26 | 0 | Details |
| US3040984A | Data-checking system | Expired / Lapsed | 1957-03-25 | 1962-06-26 | 0 | Details |
| US3040127A | Optical system | Expired / Lapsed | 1959-08-03 | 1962-06-19 | 0 | Details |
| US3039989A | Curable polyethylene containing basic lead carbonate and a … | Expired / Lapsed | 1959-06-18 | 1962-06-19 | 2 | Details |
| US3040261A | Suppression of harmonics in detection | Expired / Lapsed | 1957-01-22 | 1962-06-19 | 0 | Details |
| US3037457A | Pumps | Expired / Lapsed | 1959-08-26 | 1962-06-05 | 0 | Details |
| US3036368A | End terminal for sheathed tubular heater and method of manu… | Expired / Lapsed | 1959-07-28 | 1962-05-29 | 0 | Details |
| US3036765A | Industrial card reader | Expired / Lapsed | 1959-07-02 | 1962-05-29 | 0 | Details |
| US3035759A | Rotor and stator construction | Expired / Lapsed | 1957-11-13 | 1962-05-22 | 0 | Details |
| US3035216A | Angle and arcuate position control system | Expired / Lapsed | 1959-11-19 | 1962-05-15 | 0 | Details |
| US3034772A | Evaporative cooler pad holder | Expired / Lapsed | 1959-08-31 | 1962-05-15 | 0 | Details |
| US3035231A | Frequency difference discriminator | Expired / Lapsed | 1959-01-16 | 1962-05-15 | 0 | Details |
| US3033991A | Non-contacting crop shear detector | Expired / Lapsed | 1959-12-29 | 1962-05-08 | 0 | Details |
| US3033727A | Process for making void-free insulated conductors | Expired / Lapsed | 1956-11-09 | 1962-05-08 | 2 | Details |
| US3031601A | Circuit protective apparatus | Expired / Lapsed | 1960-09-27 | 1962-04-24 | 0 | Details |
| US3031591A | Pressure measuring gage | Expired / Lapsed | 1959-05-27 | 1962-04-24 | 0 | Details |
| US3030512A | Monochromator system | Expired / Lapsed | 1958-11-21 | 1962-04-17 | 0 | Details |
| US3030331A | Process for preparing copolyesters comprising reacting a ca… | Expired / Lapsed | 1957-08-22 | 1962-04-17 | 2 | Details |
| US3028499A | Expanded scale photoelectric device | Expired / Lapsed | 1959-11-02 | 1962-04-03 | 0 | Details |
| US3028472A | Timer systems for cooking apparatus, or the like | Expired / Lapsed | 1959-01-14 | 1962-04-03 | 0 | Details |
| US3026210A | Transparent alumina and method of preparation | Expired / Lapsed | 1961-01-03 | 1962-03-20 | 2 | Details |
| US3026485A | Unijunction relaxation oscillator with transistor, in disch… | Expired / Lapsed | 1959-12-07 | 1962-03-20 | 0 | Details |
| US3026475A | Frequency scanning filter arrangement | Expired / Lapsed | 1958-01-13 | 1962-03-20 | 0 | Details |
| US3025399A | Flaw detection | Expired / Lapsed | 1958-10-31 | 1962-03-13 | 0 | Details |
| US3025476A | Crystal controlled high frequency transistor oscillator | Expired / Lapsed | 1958-06-18 | 1962-03-13 | 0 | Details |
| US3024401A | Motor control circuit | Expired / Lapsed | 1960-08-24 | 1962-03-06 | 0 | Details |
| US3021292A | Hydrocarbon rubber-vinyl containing organopolysiloxane comp… | Expired / Lapsed | 1954-08-16 | 1962-02-13 | 2 | Details |
| CA635434A | Electrical receptacle | Expired / Lapsed | — | 1962-01-30 | 0 | Details |
| US3018449A | Electronic commutator | Expired / Lapsed | 1959-11-25 | 1962-01-23 | 0 | Details |
| US3017384A | Organopolysiloxane fibers | Expired / Lapsed | 1960-01-18 | 1962-01-16 | 2 | Details |
| US3017162A | Heating and cooling apparatus | Expired / Lapsed | 1959-09-17 | 1962-01-16 | 0 | Details |
| US3017103A | Service-charge calculation system | Expired / Lapsed | 1958-11-24 | 1962-01-16 | 0 | Details |
| US3015974A | Automatic control system for rolling mills and adjustable d… | Expired / Lapsed | 1958-09-18 | 1962-01-09 | 0 | Details |
| US3016313A | Semiconductor devices and methods of making the same | Expired / Lapsed | 1958-05-15 | 1962-01-09 | 2 | Details |
| US3015739A | Direct-current charged magnetic modulator | Expired / Lapsed | 1958-10-31 | 1962-01-02 | 0 | Details |
| US3015730A | Electronic curve follower | Expired / Lapsed | 1956-10-26 | 1962-01-02 | 0 | Details |
| US3015458A | Stall and high speed bufffeting limiter for aircraft | Expired / Lapsed | 1956-10-01 | 1962-01-02 | 0 | Details |
| US3014211A | Digital-to-analog converter | Expired / Lapsed | 1957-06-10 | 1961-12-19 | 0 | Details |
| US3013215A | Temperature controlled transistor circuit | Expired / Lapsed | 1959-06-16 | 1961-12-12 | 0 | Details |
| US3013254A | Information storage apparatus | Expired / Lapsed | 1957-01-23 | 1961-12-12 | 0 | Details |
| US3012159A | Terminal arrangement for electrical apparatus | Expired / Lapsed | 1959-08-31 | 1961-12-05 | 0 | Details |
| US3012244A | Receiver scanning system | Expired / Lapsed | 1949-08-04 | 1961-12-05 | 0 | Details |
| US3010308A | High expansion ratio condensation nuclei apparatus | Expired / Lapsed | 1957-12-06 | 1961-11-28 | 0 | Details |
| US3009332A | Variable output air conditioning unit and control arrangeme… | Expired / Lapsed | 1960-09-16 | 1961-11-21 | 0 | Details |
| US3009638A | Trigonometric function generator | Expired / Lapsed | 1959-06-26 | 1961-11-21 | 0 | Details |
| US3009033A | Limit switches | Expired / Lapsed | 1959-04-20 | 1961-11-14 | 0 | Details |
| US3008066A | Information storage system | Expired / Lapsed | 1960-05-19 | 1961-11-07 | 0 | Details |
| US3008044A | Application of superconductivity in guiding charged particl… | Expired / Lapsed | 1960-02-25 | 1961-11-07 | 0 | Details |
| US3006775A | Ceramic material and method of making the same | Expired / Lapsed | 1959-09-23 | 1961-10-31 | 2 | Details |
| US3006184A | Ultrasound thickness gauge | Expired / Lapsed | 1957-06-17 | 1961-10-31 | 0 | Details |
| US3004871A | Rendering cellulosic materials non-adherent | Expired / Lapsed | 1959-07-23 | 1961-10-17 | 2 | Details |
| US3004429A | Dynamic flowmeter | Expired / Lapsed | 1956-02-29 | 1961-10-17 | 0 | Details |
| US3004101A | Color radiography | Expired / Lapsed | 1956-04-09 | 1961-10-10 | 0 | Details |
| US3001116A | Servosystem inverse gain changer | Expired / Lapsed | 1957-10-28 | 1961-09-19 | 0 | Details |
| US3000000A | Automatic reading system | Expired / Lapsed | 1955-05-06 | 1961-09-12 | 0 | Details |
| US2997665A | Multivibrator circuit having a bistable circuit driving and… | Expired / Lapsed | 1959-07-22 | 1961-08-22 | 0 | Details |
| US2997596A | Bistable electro-optical network | Expired / Lapsed | 1957-12-27 | 1961-08-22 | 0 | Details |
| US2997419A | Cold welding of polyester resins | Expired / Lapsed | 1956-10-18 | 1961-08-22 | 2 | Details |
| US2996408A | Copper plating process and solution | Expired / Lapsed | 1958-03-31 | 1961-08-15 | 3 | Details |
| US2995975A | Photoelectric exposure meter | Expired / Lapsed | 1957-11-29 | 1961-08-15 | 0 | Details |
| US2995067A | Optical apparatus | Expired / Lapsed | 1958-12-24 | 1961-08-08 | 0 | Details |
| US2994767A | Power conserving mixer and oscillator | Expired / Lapsed | 1958-08-21 | 1961-08-01 | 0 | Details |
| US2994125A | Hard surface metal structure | Expired / Lapsed | 1956-12-26 | 1961-08-01 | 2 | Details |
| US2993809A | Method for making treated silica fillers | Expired / Lapsed | 1959-10-23 | 1961-07-25 | 1 | Details |
| US2993820A | Insulated conductor and method of making same | Expired / Lapsed | 1956-04-09 | 1961-07-25 | 2 | Details |
| US2991572A | Fill and steam control valve assembly for steam irons | Expired / Lapsed | 1959-04-20 | 1961-07-11 | 0 | Details |
| US2992395A | Feedback amplifier circuit | Expired / Lapsed | 1958-12-30 | 1961-07-11 | 0 | Details |
| US2992349A | Field enhanced luminescence system | Expired / Lapsed | 1957-10-24 | 1961-07-11 | 0 | Details |
| US2992330A | Position indicating system | Expired / Lapsed | 1957-09-05 | 1961-07-11 | 0 | Details |
| US2992408A | Automatic reading system | Expired / Lapsed | 1955-05-16 | 1961-07-11 | 0 | Details |
| US2990582A | Color striping of polytetrafluoroethylene resin | Expired / Lapsed | 1959-04-01 | 1961-07-04 | 2 | Details |
| US2986913A | Vertical-axis washing and centrifuging machine | Expired / Lapsed | 1960-10-10 | 1961-06-06 | 0 | Details |
| US2987666A | Solid state power stage amplifier employing silicon rectifi… | Expired / Lapsed | 1959-02-02 | 1961-06-06 | 0 | Details |
| US2987674A | Frequency measuring apparatus | Expired / Lapsed | 1957-11-18 | 1961-06-06 | 0 | Details |
| US2986009A | Thermo-electric refrigerators | Expired / Lapsed | 1959-07-13 | 1961-05-30 | 0 | Details |
| US2985298A | Apparatus for evaluating the printing of machine readable d… | Expired / Lapsed | 1960-04-01 | 1961-05-23 | 0 | Details |
| US2985866A | Information storage system | Expired / Lapsed | 1958-09-29 | 1961-05-23 | 0 | Details |
| US2985544A | Method of rendering cellulosic material non-adherent and ar… | Expired / Lapsed | 1958-03-26 | 1961-05-23 | 2 | Details |
| US2985545A | Method of rendering cellulosic material non-adherent and ar… | Expired / Lapsed | 1958-03-26 | 1961-05-23 | 2 | Details |
| US2985546A | Method of rendering cellulosic material non-adherent and ar… | Expired / Lapsed | 1958-03-26 | 1961-05-23 | 2 | Details |
| US2985755A | Communication system | Expired / Lapsed | 1957-05-27 | 1961-05-23 | 0 | Details |
| US2984742A | Circuit for a transistor class a output stage | Expired / Lapsed | 1956-07-27 | 1961-05-16 | 0 | Details |
| US2983822A | Form recognition method and system therefor | Expired / Lapsed | 1957-09-30 | 1961-05-09 | 0 | Details |
| US2982907A | Control system | Expired / Lapsed | 1958-10-14 | 1961-05-02 | 0 | Details |
| US2982368A | Automatic batch-weighing control system | Expired / Lapsed | 1957-06-26 | 1961-05-02 | 0 | Details |
| US2980332A | Electronic curve follower and analog computer | Expired / Lapsed | 1956-10-26 | 1961-04-18 | 0 | Details |
| US2979479A | Silicone rubber of improved tear strength | Expired / Lapsed | 1957-07-15 | 1961-04-11 | 2 | Details |
| US2977672A | Method of making bonded wire circuit | Expired / Lapsed | 1958-12-12 | 1961-04-04 | 0 | Details |
| US2977500A | Production and control of electron beams | Expired / Lapsed | 1959-06-16 | 1961-03-28 | 0 | Details |
| US2977523A | Control circuit | Expired / Lapsed | 1958-12-31 | 1961-03-28 | 0 | Details |
| US2976463A | Motor-protecting relay | Expired / Lapsed | 1957-02-01 | 1961-03-21 | 0 | Details |
| US2975345A | Electric capacitor | Expired / Lapsed | 1957-05-15 | 1961-03-14 | 0 | Details |
| US2975290A | Electroluminescent devices and networks | Expired / Lapsed | 1956-05-15 | 1961-03-14 | 0 | Details |
| US2974296A | Electromechanical transducer | Expired / Lapsed | 1959-05-26 | 1961-03-07 | 0 | Details |
| US2974104A | High-energy magnetic material | Expired / Lapsed | 1955-04-08 | 1961-03-07 | 1 | Details |
| US2972032A | Vacuum interrupter | Expired / Lapsed | 1959-01-02 | 1961-02-14 | 0 | Details |
| US2970806A | Balanced governing valve with minimum reaction gradients | Expired / Lapsed | 1960-01-21 | 1961-02-07 | 0 | Details |
| US2970126A | Water repellent composition containing organopolysiloxane a… | Expired / Lapsed | 1958-06-12 | 1961-01-31 | 2 | Details |
| US2969442A | Detent mechanism for alternating current switch | Expired / Lapsed | 1958-07-30 | 1961-01-24 | 0 | Details |
| US2968770A | Unijunction transistor circuit | Expired / Lapsed | 1958-11-19 | 1961-01-17 | 0 | Details |
| US2967113A | Coating method | Expired / Lapsed | 1957-11-18 | 1961-01-03 | 2 | Details |
| US2967251A | Electronic power supply regulator | Expired / Lapsed | 1957-06-05 | 1961-01-03 | 0 | Details |
| US2966673A | Digital transducer | Expired / Lapsed | 1959-07-30 | 1960-12-27 | 0 | Details |
| US2966429A | Method of and apparatus for making printed circuits | Expired / Lapsed | 1956-08-31 | 1960-12-27 | 2 | Details |
| US2966028A | Aerodynamic diffuser mechanisms | Expired / Lapsed | 1947-10-17 | 1960-12-27 | 0 | Details |
| US2965763A | Position indicating device | Expired / Lapsed | 1957-09-23 | 1960-12-20 | 0 | Details |
| US2964679A | Arc plasma generator | Expired / Lapsed | 1959-06-26 | 1960-12-13 | 0 | Details |
| US2963268A | Pressurized seal | Expired / Lapsed | 1957-03-25 | 1960-12-06 | 0 | Details |
| US2963307A | Honeycomb seal | Expired / Lapsed | 1954-12-28 | 1960-12-06 | 0 | Details |
| US2962684A | Sheathed electric heating units and methods of making the s… | Expired / Lapsed | 1958-11-12 | 1960-11-29 | 0 | Details |
| US2962598A | Electric power control system | Expired / Lapsed | 1956-05-28 | 1960-11-29 | 0 | Details |
| US2961501A | Enclosed electric switch | Expired / Lapsed | 1958-10-23 | 1960-11-22 | 0 | Details |
| US2958735A | Video tape recording system | Expired / Lapsed | 1956-02-24 | 1960-11-01 | 0 | Details |
| US2958046A | Distributed amplifier | Expired / Lapsed | 1960-02-29 | 1960-10-25 | 0 | Details |
| US2958022A | Asymmetrically conductive device | Expired / Lapsed | 1958-05-15 | 1960-10-25 | 0 | Details |
| US2957942A | Projection television system | Expired / Lapsed | 1958-01-13 | 1960-10-25 | 0 | Details |
| US2957340A | Ultrasonic image detector | Expired / Lapsed | 1956-03-15 | 1960-10-25 | 0 | Details |
| US2958002A | Production of colored images | Expired / Lapsed | 1954-10-29 | 1960-10-25 | 0 | Details |
| CA607160A | Electrical signal regulator | Expired / Lapsed | — | 1960-10-18 | 0 | Details |
| US2956435A | Condensation nuclei detector | Expired / Lapsed | 1957-01-29 | 1960-10-18 | 0 | Details |
| US2955449A | Control arrangement for clothes washing machine | Expired / Lapsed | 1959-07-03 | 1960-10-11 | 0 | Details |
| US2955171A | Symmetrical diode limiter | Expired / Lapsed | 1957-02-18 | 1960-10-04 | 0 | Details |
| US2954476A | Photo-electronic network | Expired / Lapsed | 1958-11-03 | 1960-09-27 | 0 | Details |
| CA605397A | Temperature stabilized transistor amplifier | Expired / Lapsed | — | 1960-09-20 | 0 | Details |
| US2950375A | Percolator brew strength control | Expired / Lapsed | 1954-04-23 | 1960-08-23 | 0 | Details |
| US2948635A | Phosphor evaporation method and apparatus | Expired / Lapsed | 1959-01-12 | 1960-08-09 | 2 | Details |
| US2948666A | Irradiation process | Expired / Lapsed | 1956-11-21 | 1960-08-09 | 2 | Details |
| US2947610A | Method of making diamonds | Expired / Lapsed | 1958-01-06 | 1960-08-02 | 2 | Details |
| US2945976A | Electroluminescent lamp and manufacture thereof | Expired / Lapsed | 1957-12-10 | 1960-07-19 | 0 | Details |
| US2945792A | Polyolefins | Expired / Lapsed | 1957-05-20 | 1960-07-19 | 2 | Details |
| US2946044A | Signal processing system | Expired / Lapsed | 1954-08-09 | 1960-07-19 | 0 | Details |
| US2945208A | Compressional wave transducer | Expired / Lapsed | 1951-01-05 | 1960-07-12 | 0 | Details |
| US2943474A | Washing machine recirculation system | Expired / Lapsed | 1957-06-20 | 1960-07-05 | 0 | Details |
| US2944171A | Intermediate ring squirrel cage rotor | Expired / Lapsed | 1957-01-04 | 1960-07-05 | 0 | Details |
| US2943147A | Projection system | Expired / Lapsed | 1958-01-13 | 1960-06-28 | 0 | Details |
| US2943251A | Control of machine tool operation | Expired / Lapsed | 1955-12-06 | 1960-06-28 | 0 | Details |
| US2941248A | High temperature high pressure apparatus | Expired / Lapsed | 1958-01-06 | 1960-06-21 | 0 | Details |
| US2942165A | Liquid cooled current rectifiers | Expired / Lapsed | 1957-01-03 | 1960-06-21 | 0 | Details |
| US2941141A | Half-wave magnetic amplifier | Expired / Lapsed | 1956-11-30 | 1960-06-14 | 0 | Details |
| US2941139A | Constant output control system for aircraft and the like | Expired / Lapsed | 1956-08-31 | 1960-06-14 | 0 | Details |
| US2940026A | Variable bandwith servomechanism | Expired / Lapsed | 1957-06-18 | 1960-06-07 | 0 | Details |
| US2940069A | Combined supervisory control and telemetering system | Expired / Lapsed | 1954-11-15 | 1960-06-07 | 0 | Details |
| US2938669A | Quality control device | Expired / Lapsed | 1953-07-06 | 1960-05-31 | 0 | Details |
| US2938136A | Electroluminescent lamp | Expired / Lapsed | 1958-08-26 | 1960-05-24 | 0 | Details |
| US2938159A | Magnetic amplifiers | Expired / Lapsed | 1958-01-31 | 1960-05-24 | 0 | Details |
| US2938010A | Process for curing silica containing organo polysiloxane el… | Expired / Lapsed | 1956-04-12 | 1960-05-24 | 2 | Details |
| US2938009A | Process of treating silica with a siloxane and product ther… | Expired / Lapsed | 1956-04-11 | 1960-05-24 | 2 | Details |
| US2937239A | Skew servo for multiple channel recording system | Expired / Lapsed | 1956-02-13 | 1960-05-17 | 0 | Details |
| US2937365A | Programming control system | Expired / Lapsed | 1955-12-28 | 1960-05-17 | 0 | Details |
| US2937358A | Printed circuit sandwiched in glass | Expired / Lapsed | 1955-04-18 | 1960-05-17 | 0 | Details |
| US2936409A | Current rectifier assemblies | Expired / Lapsed | 1956-12-13 | 1960-05-10 | 0 | Details |
| US2936261A | Sealing irradiated polyethylene | Expired / Lapsed | 1955-05-18 | 1960-05-10 | 2 | Details |
| US2936296A | Polyesters from terephthalic acid, ethylene glycol and a hi… | Expired / Lapsed | 1954-12-10 | 1960-05-10 | 2 | Details |
| US2936256A | Semiconductor devices | Expired / Lapsed | 1954-06-01 | 1960-05-10 | 2 | Details |
| US2933648A | Information display apparatus | Expired / Lapsed | 1956-08-14 | 1960-04-19 | 0 | Details |
| US2933547A | Solid state electric cell | Expired / Lapsed | 1955-06-29 | 1960-04-19 | 2 | Details |
| US2930083A | Extrusion of cross-linked polyethylene and process of coati… | Expired / Lapsed | 1957-08-30 | 1960-03-29 | 2 | Details |
| US2930964A | Transformer for potential device | Expired / Lapsed | 1955-08-22 | 1960-03-29 | 0 | Details |
| US2929902A | Mercury button switch with insulated terminal | Expired / Lapsed | 1958-06-02 | 1960-03-22 | 0 | Details |
| US2929921A | Code controlled communication system | Expired / Lapsed | 1955-01-26 | 1960-03-22 | 0 | Details |
| US2928980A | Color information presentation system | Expired / Lapsed | 1956-08-16 | 1960-03-15 | 0 | Details |
| US2928162A | Junction type semiconductor device having improved heat dis… | Expired / Lapsed | 1953-10-16 | 1960-03-15 | 0 | Details |
| US2926264A | Light sensitive system | Expired / Lapsed | 1956-09-10 | 1960-02-23 | 0 | Details |
| US2924812A | Automatic reading system | Expired / Lapsed | 1957-10-31 | 1960-02-09 | 0 | Details |
| US2924685A | Magnetic switch | Expired / Lapsed | 1957-09-26 | 1960-02-09 | 0 | Details |
| US2924754A | Radiation responsive system | Expired / Lapsed | 1956-03-29 | 1960-02-09 | 0 | Details |
| US2922618A | Turbo-machine rotor | Expired / Lapsed | 1956-03-06 | 1960-01-26 | 0 | Details |
| US2922937A | Capacitor and dielectric material therefor | Expired / Lapsed | 1956-02-08 | 1960-01-26 | 1 | Details |
| US2922887A | Inspection apparatus and method | Expired / Lapsed | 1954-04-26 | 1960-01-26 | 0 | Details |
| US2920377A | Evaporator structure and method of manufacture | Expired / Lapsed | 1956-10-12 | 1960-01-12 | 0 | Details |
| US2921006A | Polymerization with high energy electrons | Expired / Lapsed | 1952-06-03 | 1960-01-12 | 2 | Details |
| US2920232A | Display device with storage | Expired / Lapsed | 1958-08-18 | 1960-01-05 | 0 | Details |
| US2920242A | Electric circuit | Expired / Lapsed | 1957-12-05 | 1960-01-05 | 0 | Details |
| US2919473A | Molding of polyethylene irradiated with high energy electro… | Expired / Lapsed | 1954-06-17 | 1960-01-05 | 2 | Details |
| US2919302A | Color information presenting system | Expired / Lapsed | 1957-10-07 | 1959-12-29 | 0 | Details |
| US2918827A | Linear actuator | Expired / Lapsed | 1957-03-01 | 1959-12-29 | 0 | Details |
| US2918662A | Magnetic tape arrangement system | Expired / Lapsed | 1957-06-03 | 1959-12-22 | 0 | Details |
| US2917175A | Unbalance sensing arrangement for machines having a centrif… | Expired / Lapsed | 1959-01-22 | 1959-12-15 | 0 | Details |
| US2916593A | Induction heating apparatus and its use in silicon producti… | Expired / Lapsed | 1958-07-25 | 1959-12-08 | 0 | Details |
| US2916685A | Direct current motor speed control system | Expired / Lapsed | 1956-08-13 | 1959-12-08 | 0 | Details |
| US2916690A | Apparatus for measuring magnetic fields | Expired / Lapsed | 1952-12-06 | 1959-12-08 | 0 | Details |
| US2915630A | Pulse reverter | Expired / Lapsed | 1955-10-06 | 1959-12-01 | 0 | Details |
| US2915599A | Logarithmic amplifier | Expired / Lapsed | 1952-06-06 | 1959-12-01 | 0 | Details |
| US2913637A | Photoconductive control circuit | Expired / Lapsed | 1955-12-28 | 1959-11-17 | 0 | Details |
| US2913511A | Fuel cell | Expired / Lapsed | 1955-06-29 | 1959-11-17 | 2 | Details |
| US2913705A | Storage system | Expired / Lapsed | 1955-01-10 | 1959-11-17 | 0 | Details |
| US2912569A | Communication system with automatic amplitude control | Expired / Lapsed | 1955-11-30 | 1959-11-10 | 0 | Details |
| US2912651A | Automatic frequency control | Expired / Lapsed | 1954-03-29 | 1959-11-10 | 0 | Details |
| US2910629A | Circuit breaker panelboard | Expired / Lapsed | 1956-03-29 | 1959-10-27 | 0 | Details |
| US2910351A | Method of making printed circuit | Expired / Lapsed | 1955-08-03 | 1959-10-27 | 2 | Details |
| US2908147A | Room air conditioning apparatus having filter arrangement f… | Expired / Lapsed | 1957-04-08 | 1959-10-13 | 0 | Details |
| US2907938A | Position control system | Expired / Lapsed | 1957-04-11 | 1959-10-06 | 0 | Details |
| US2904192A | Lamp transfer apparatus | Expired / Lapsed | 1956-11-23 | 1959-09-15 | 0 | Details |
| US2904777A | Magnetic tape reading system | Expired / Lapsed | 1956-11-05 | 1959-09-15 | 0 | Details |
| US2902831A | Governing system for reheat steam turbine powerplant | Expired / Lapsed | 1958-08-22 | 1959-09-08 | 0 | Details |
| US2902475A | Linear polyamide resins | Expired / Lapsed | 1956-04-13 | 1959-09-01 | 2 | Details |
| US2902604A | Scintillation converter | Expired / Lapsed | 1955-09-26 | 1959-09-01 | 0 | Details |
| US2901652A | Electroluminescent lamp construction | Expired / Lapsed | 1957-12-10 | 1959-08-25 | 0 | Details |
| US2901745A | Signal processing arrangement | Expired / Lapsed | 1957-04-26 | 1959-08-25 | 0 | Details |
| US2901703A | Frictionless suspension means for rotary elements | Expired / Lapsed | 1957-02-19 | 1959-08-25 | 0 | Details |
| US2900485A | Portable electrical torch | Expired / Lapsed | 1957-03-19 | 1959-08-18 | 0 | Details |
| US2900500A | Electronic counter and shift register | Expired / Lapsed | 1954-10-19 | 1959-08-18 | 0 | Details |
| US2898434A | Adjustable reference device | Expired / Lapsed | 1956-12-26 | 1959-08-04 | 0 | Details |
| US2898498A | Photoemitters | Expired / Lapsed | 1956-07-19 | 1959-08-04 | 0 | Details |
| US2897672A | Flow meter | Expired / Lapsed | 1955-10-27 | 1959-08-04 | 0 | Details |
| US2898525A | Light responsive system | Expired / Lapsed | 1955-03-15 | 1959-08-04 | 0 | Details |
| US2898411A | Gain control circuit for semiconductor amplifiers | Expired / Lapsed | 1953-12-07 | 1959-08-04 | 0 | Details |
| US2897432A | Electrical signal regulator | Expired / Lapsed | 1957-05-17 | 1959-07-28 | 0 | Details |
| US2897127A | Method of producing cross-linked polyvinyl alcohol | Expired / Lapsed | 1955-08-29 | 1959-07-28 | 2 | Details |
| US2897293A | Magnetic amplifiers with biased rectifiers | Expired / Lapsed | 1954-06-11 | 1959-07-28 | 0 | Details |
| US2896100A | Electrodynamic machine | Expired / Lapsed | 1957-12-09 | 1959-07-21 | 0 | Details |
| US2895891A | Cellulosic materials | Expired / Lapsed | 1957-05-15 | 1959-07-21 | 2 | Details |
| US2892334A | Combination washer and dryer | Expired / Lapsed | 1955-06-02 | 1959-06-30 | 0 | Details |
| US2892378A | Indicating turbidimeter | Expired / Lapsed | 1955-04-26 | 1959-06-30 | 0 | Details |
| US2889692A | Defrost evaporator structure | Expired / Lapsed | 1957-11-25 | 1959-06-09 | 0 | Details |
| US2890410A | Impulse testing | Expired / Lapsed | 1955-06-27 | 1959-06-09 | 0 | Details |
| US2890389A | Lightning arrester improvements | Expired / Lapsed | 1955-03-24 | 1959-06-09 | 0 | Details |
| US2889780A | Fluid flow measurement and control apparatus | Expired / Lapsed | 1953-03-09 | 1959-06-09 | 0 | Details |
| US2889542A | Magnetic coincidence gating register | Expired / Lapsed | 1957-03-22 | 1959-06-02 | 0 | Details |
| US2889511A | Mechanical rectifier current and voltage control | Expired / Lapsed | 1954-04-19 | 1959-06-02 | 0 | Details |
| US2888023A | Hydraulic thrust bearing wear indicator and safety device | Expired / Lapsed | 1956-04-13 | 1959-05-26 | 0 | Details |
| US2888424A | Curable polyethylene composition comprising a peroxide cont… | Expired / Lapsed | 1955-05-18 | 1959-05-26 | 2 | Details |
| US2887648A | Phase shifting network | Expired / Lapsed | 1956-07-25 | 1959-05-19 | 0 | Details |
| US2887628A | Semiconductor device construction | Expired / Lapsed | 1956-06-12 | 1959-05-19 | 0 | Details |
| US2885789A | Apparatus for drying fabrics | Expired / Lapsed | 1955-09-28 | 1959-05-12 | 0 | Details |
| US2885613A | Binary comparator system for position control systems | Expired / Lapsed | 1958-03-26 | 1959-05-05 | 0 | Details |
| US2885562A | Photoelectric device | Expired / Lapsed | 1955-05-09 | 1959-05-05 | 1 | Details |
| US2883571A | Electric incandescent lamp | Expired / Lapsed | 1958-03-03 | 1959-04-21 | 0 | Details |
| US2883592A | Encapsulated selenium rectifiers | Expired / Lapsed | 1955-12-30 | 1959-04-21 | 2 | Details |
| US2883366A | Quaternary phosphonium compounds as polymerization catalyst… | Expired / Lapsed | 1954-12-10 | 1959-04-21 | 2 | Details |
| US2882339A | Passive conference circuit | Expired / Lapsed | 1956-09-20 | 1959-04-14 | 0 | Details |
| US2881633A | Combination washer-dryer drive mechanism | Expired / Lapsed | 1956-07-19 | 1959-04-14 | 0 | Details |
| US2882513A | Terminal assembly for enclosed electric apparatus | Expired / Lapsed | 1954-11-18 | 1959-04-14 | 0 | Details |
| US2882462A | Semiconductor device | Expired / Lapsed | 1954-06-29 | 1959-04-14 | 0 | Details |
| US2881337A | Acoustically treated motor | Expired / Lapsed | 1957-07-01 | 1959-04-07 | 0 | Details |
| US2879482A | Semiconductor mixing circuits | Expired / Lapsed | 1958-04-22 | 1959-03-24 | 0 | Details |
| US2878579A | Automatic clothes dryer control | Expired / Lapsed | 1954-08-17 | 1959-03-24 | 0 | Details |
| US2876498A | Method of forming reinforced pan | Expired / Lapsed | 1953-08-17 | 1959-03-10 | 0 | Details |
| US2874072A | Autocatalytic copper plating process and solution | Expired / Lapsed | 1956-09-17 | 1959-02-17 | 1 | Details |
| US2873198A | Hard refractory compositions | Expired / Lapsed | 1958-04-17 | 1959-02-10 | 2 | Details |
| US2871289A | Error-checking system | Expired / Lapsed | 1955-10-10 | 1959-01-27 | 0 | Details |
| US2871330A | Silicon current controlling devices | Expired / Lapsed | 1954-12-22 | 1959-01-27 | 1 | Details |
| US2869699A | Two speed drive | Expired / Lapsed | 1956-12-12 | 1959-01-20 | 0 | Details |
| US2868059A | Steel mill optical width gage | Expired / Lapsed | 1953-10-05 | 1959-01-13 | 0 | Details |
| US2867541A | Method of preparing transparent luminescent screens | Expired / Lapsed | 1957-02-25 | 1959-01-06 | 2 | Details |
| US2867603A | Blends of organopolysiloxane, polybutadiene and di-alpha-cu… | Expired / Lapsed | 1956-03-27 | 1959-01-06 | 2 | Details |
| US2867599A | Vulcanizable vinyl-containing organopolysiloxanes and proce… | Expired / Lapsed | 1954-08-16 | 1959-01-06 | 2 | Details |
| US2866376A | Optical flaw detection apparatus | Expired / Lapsed | 1954-09-29 | 1958-12-30 | 0 | Details |
| US2866153A | Three-dimension servosystem transducer | Expired / Lapsed | 1957-11-19 | 1958-12-23 | 0 | Details |
| US2866040A | Low-voltage current-limiting fuse | Expired / Lapsed | 1957-09-13 | 1958-12-23 | 0 | Details |
| US2866145A | Error signal developing means for position programming cont… | Expired / Lapsed | 1956-12-11 | 1958-12-23 | 0 | Details |
| US2866191A | Information indicating instrument | Expired / Lapsed | 1950-12-28 | 1958-12-23 | 0 | Details |
| US2864980A | Sealed current rectifier | Expired / Lapsed | 1957-06-10 | 1958-12-16 | 0 | Details |
| US2864982A | Electric capacitor | Expired / Lapsed | 1952-12-17 | 1958-12-16 | 2 | Details |
| US2864006A | Cooling structure for semiconductor devices | Expired / Lapsed | 1956-07-06 | 1958-12-09 | 0 | Details |
| US2864062A | Negative resistance using transistors | Expired / Lapsed | 1955-02-15 | 1958-12-09 | 0 | Details |
| US2863955A | Direct-coupled amplifiers | Expired / Lapsed | 1953-03-09 | 1958-12-09 | 0 | Details |
| US2863137A | Tape-spacing system | Expired / Lapsed | 1957-02-05 | 1958-12-02 | 0 | Details |
| US2862840A | Semiconductor devices | Expired / Lapsed | 1956-09-26 | 1958-12-02 | 2 | Details |
| US2863023A | Bimetallic strip thermally responsive device | Expired / Lapsed | 1956-01-27 | 1958-12-02 | 0 | Details |
| US2863008A | Stabilized amplifier | Expired / Lapsed | 1954-08-27 | 1958-12-02 | 0 | Details |
| US2862194A | Electric protective equipment | Expired / Lapsed | 1956-11-30 | 1958-11-25 | 0 | Details |
| US2861237A | Transistor switch voltage regulator | Expired / Lapsed | 1956-04-19 | 1958-11-18 | 0 | Details |
| US2861226A | High current rectifier | Expired / Lapsed | 1956-03-22 | 1958-11-18 | 0 | Details |
| US2860831A | Radix converter | Expired / Lapsed | 1953-12-21 | 1958-11-18 | 0 | Details |
| US2861230A | Calorized point contact electrode for semiconductor devices | Expired / Lapsed | 1953-11-24 | 1958-11-18 | 0 | Details |
| US2860219A | Silicon current controlling devices | Expired / Lapsed | 1954-09-07 | 1958-11-11 | 2 | Details |
| US2860218A | Germanium current controlling devices | Expired / Lapsed | 1954-02-04 | 1958-11-11 | 2 | Details |
| US2859360A | Wave generator | Expired / Lapsed | 1955-12-12 | 1958-11-04 | 0 | Details |
| US2858435A | Signal processing arrangement | Expired / Lapsed | 1956-11-08 | 1958-10-28 | 0 | Details |
| US2857761A | Mass flow meter | Expired / Lapsed | 1954-12-20 | 1958-10-28 | 0 | Details |
| US2858429A | Gated-delay counter | Expired / Lapsed | 1953-12-28 | 1958-10-28 | 0 | Details |
| US2858259A | Electron irradiation of preformed polyamide resin | Expired / Lapsed | 1952-12-06 | 1958-10-28 | 2 | Details |
| US2857356A | Organopolysiloxane compositions having pressure-sensitive a… | Expired / Lapsed | 1954-07-08 | 1958-10-21 | 2 | Details |
| US2856584A | Voltage reference level variance indicator | Expired / Lapsed | 1956-09-28 | 1958-10-14 | 0 | Details |
| US2856540A | Infrared detection apparatus | Expired / Lapsed | 1954-12-30 | 1958-10-14 | 1 | Details |
| US2855491A | Metal-ceramic electrical resistors | Expired / Lapsed | 1954-06-30 | 1958-10-07 | 2 | Details |
| US2853918A | High speed photographic device | Expired / Lapsed | 1956-02-16 | 1958-09-30 | 0 | Details |
| US2853654A | Lighting circuit current regulator | Expired / Lapsed | 1956-08-13 | 1958-09-23 | 0 | Details |
| US2851789A | Control system for clothes dryers | Expired / Lapsed | 1956-03-13 | 1958-09-16 | 0 | Details |
| US2851790A | Temperature control means for clothes dryer | Expired / Lapsed | 1955-11-25 | 1958-09-16 | 0 | Details |
| US2852772A | Receiver scanning system | Expired / Lapsed | 1949-08-04 | 1958-09-16 | 0 | Details |
| US2849662A | Static inverse time overvoltage device | Expired / Lapsed | 1956-04-24 | 1958-08-26 | 0 | Details |
| US2848659A | Electronic control switch | Expired / Lapsed | 1955-06-10 | 1958-08-19 | 0 | Details |
| US2848670A | Automatic programming servomotor control system | Expired / Lapsed | 1954-12-30 | 1958-08-19 | 0 | Details |
| US2847343A | Ethoxyline resin compositions and their preparation | Expired / Lapsed | 1957-03-07 | 1958-08-12 | 2 | Details |
| US2846560A | Heater wire | Expired / Lapsed | 1957-05-31 | 1958-08-05 | 2 | Details |
| US2844939A | Tube-bundle combustion chamber | Expired / Lapsed | 1954-10-04 | 1958-07-29 | 0 | Details |
| US2844800A | Electrical circut coupling apparatus | Expired / Lapsed | 1953-07-29 | 1958-07-22 | 0 | Details |
| US2843747A | Automatic alignment system | Expired / Lapsed | 1957-03-08 | 1958-07-15 | 0 | Details |
| US2843555A | Room temperature curing organopolysiloxane | Expired / Lapsed | 1956-10-01 | 1958-07-15 | 2 | Details |
| US2842468A | Vapor deposition of single crystals | Expired / Lapsed | 1955-07-20 | 1958-07-08 | 2 | Details |
| US2842466A | Method of making p-nu junction semiconductor unit | Expired / Lapsed | 1954-06-15 | 1958-07-08 | 2 | Details |
| US2841003A | Control circuits for automatic clothes washing machines | Expired / Lapsed | 1955-01-17 | 1958-07-01 | 0 | Details |
| US2838733A | Phase detection | Expired / Lapsed | 1951-10-15 | 1958-06-10 | 0 | Details |
| US2836766A | Electroluminescent devices and circuits | Expired / Lapsed | 1956-05-15 | 1958-05-27 | 0 | Details |
| US2836186A | Washing apparatus with tub sealing system | Expired / Lapsed | 1955-12-14 | 1958-05-27 | 0 | Details |
| US2836744A | Insulated coil | Expired / Lapsed | 1954-06-01 | 1958-05-27 | 0 | Details |
| US2836797A | Multi-electrode field controlled germanium devices | Expired / Lapsed | 1953-03-23 | 1958-05-27 | 2 | Details |
| US2836657A | Secrecy communication system | Expired / Lapsed | 1944-11-20 | 1958-05-27 | 0 | Details |
| US2835690A | Base-catalyzed addition ot vinyl-silicon compositions | Expired / Lapsed | 1953-12-31 | 1958-05-20 | 2 | Details |
| US2834691A | Process for preparing a metal surface for coating and produ… | Expired / Lapsed | 1956-10-09 | 1958-05-13 | 2 | Details |
| US2834921A | Phase comparison protective relaying system | Expired / Lapsed | 1955-11-14 | 1958-05-13 | 0 | Details |
| US2834203A | Apparatus for measuring hardness | Expired / Lapsed | 1955-06-27 | 1958-05-13 | 0 | Details |
| US2834903A | Electroluminescent lighting device | Expired / Lapsed | 1952-10-30 | 1958-05-13 | 2 | Details |
| US2833923A | Hunting a. f. c. system | Expired / Lapsed | 1955-10-13 | 1958-05-06 | 0 | Details |
| US2830441A | Hydraulic servo-mechanism for a steam turbine intercept val… | Expired / Lapsed | 1956-10-22 | 1958-04-15 | 0 | Details |
| US2828627A | Axial support arrangement | Expired / Lapsed | 1955-11-01 | 1958-04-01 | 0 | Details |
| US2829338A | Test transformer for ring-type magnetic cores | Expired / Lapsed | 1954-05-13 | 1958-04-01 | 0 | Details |
| US2827977A | Door interlock shunt for circuit for railway vehicles | Expired / Lapsed | 1955-02-10 | 1958-03-25 | 0 | Details |
| US2828231A | Method and apparatus for ultrasonic cleansing | Expired / Lapsed | 1954-03-31 | 1958-03-25 | 4 | Details |
| US2827910A | Electrical speed control system for engines | Expired / Lapsed | 1951-12-29 | 1958-03-25 | 0 | Details |
| US2826696A | Double-base diode d. c.-a. c. (f.-m.) converter | Expired / Lapsed | 1956-08-30 | 1958-03-11 | 0 | Details |
| US2826388A | Shelf support | Expired / Lapsed | 1953-04-17 | 1958-03-11 | 0 | Details |
| US2825000A | Photographic light unit | Expired / Lapsed | 1954-10-06 | 1958-02-25 | 0 | Details |
| US2824364A | Method of assembling and evacuating an insulated vacuum pan… | Expired / Lapsed | 1954-08-27 | 1958-02-25 | 0 | Details |
| US2824264A | Electrical capacitor assembly | Expired / Lapsed | 1956-09-13 | 1958-02-18 | 0 | Details |
| US2824286A | Scale compressing circuit | Expired / Lapsed | 1952-12-20 | 1958-02-18 | 0 | Details |
| US2823312A | Semiconductor network | Expired / Lapsed | 1955-01-26 | 1958-02-11 | 0 | Details |
| US2822309A | P-n junction device and method of making the same by local … | Expired / Lapsed | 1955-06-20 | 1958-02-04 | 2 | Details |
| US2822308A | Semiconductor p-n junction units and method of making the s… | Expired / Lapsed | 1955-03-29 | 1958-02-04 | 2 | Details |
| US2822455A | Electric heating apparatus | Expired / Lapsed | 1953-08-21 | 1958-02-04 | 0 | Details |
| US2821157A | Machine for manufacturing electrical insulators | Expired / Lapsed | 1954-07-26 | 1958-01-28 | 0 | Details |
| US2821646A | Encased electroluminescent device | Expired / Lapsed | 1954-02-23 | 1958-01-28 | 0 | Details |
| US2820304A | Clothes drying machines | Expired / Lapsed | 1954-12-17 | 1958-01-21 | 0 | Details |
| US2819492A | Electrical capacitor and method of making the same | Expired / Lapsed | 1955-10-20 | 1958-01-14 | 2 | Details |
| US2819423A | Plasma transmitter | Expired / Lapsed | 1957-04-08 | 1958-01-07 | 0 | Details |
| US2816236A | Method of and means for detecting stress patterns | Expired / Lapsed | 1956-06-19 | 1957-12-10 | 0 | Details |
| US2815923A | Valve with automatic rate-of-flow control | Expired / Lapsed | 1952-07-23 | 1957-12-10 | 0 | Details |
| US2816271A | Microwave mode converter | Expired / Lapsed | 1950-11-22 | 1957-12-10 | 0 | Details |
| US2815472A | Rectifier unit | Expired / Lapsed | 1954-12-21 | 1957-12-03 | 0 | Details |
| US2815481A | Automatic rejection circuit for electrical testing apparatus | Expired / Lapsed | 1954-02-16 | 1957-12-03 | 0 | Details |
| US2813963A | Thermostatically controlled heating apparatus | Expired / Lapsed | 1955-12-27 | 1957-11-19 | 0 | Details |
| US2813811A | High strength crystals | Expired / Lapsed | 1954-11-22 | 1957-11-19 | 2 | Details |
| US2813957A | Semi-conductor device | Expired / Lapsed | 1954-01-21 | 1957-11-19 | 2 | Details |
| US2813146A | Colored light system | Expired / Lapsed | 1954-06-01 | 1957-11-12 | 0 | Details |
| US2811617A | Electric switch | Expired / Lapsed | 1955-09-19 | 1957-10-29 | 0 | Details |
| US2811601A | Latching relay | Expired / Lapsed | 1955-06-28 | 1957-10-29 | 0 | Details |
| US2811657A | Means for securing a capacitor in a dynamoelectric machine … | Expired / Lapsed | 1955-02-03 | 1957-10-29 | 0 | Details |
| US2811713A | Signal processing circuit | Expired / Lapsed | 1954-03-09 | 1957-10-29 | 0 | Details |
| US2810218A | Steam and dampening iron | Expired / Lapsed | 1956-09-06 | 1957-10-22 | 0 | Details |
| US2809946A | Molding compositions containing mineral fillers and product… | Expired / Lapsed | 1954-11-10 | 1957-10-15 | 2 | Details |
| US2809348A | Device for testing wire insulation | Expired / Lapsed | 1956-12-24 | 1957-10-08 | 0 | Details |
| US2809362A | Plug-in connector | Expired / Lapsed | 1955-04-19 | 1957-10-08 | 0 | Details |
| US2808204A | Binary digital computing apparatus | Expired / Lapsed | 1956-05-08 | 1957-10-01 | 0 | Details |
| US2808203A | Binary shift register | Expired / Lapsed | 1952-02-28 | 1957-10-01 | 0 | Details |
| US2806983A | Remote base transistor | Expired / Lapsed | 1956-06-01 | 1957-09-17 | 2 | Details |
| US2806807A | Method of making contacts to semiconductor bodies | Expired / Lapsed | 1955-08-23 | 1957-09-17 | 2 | Details |
| US2806957A | Apparatus and method for spectral analysis | Expired / Lapsed | 1954-10-22 | 1957-09-17 | 0 | Details |
| US2806958A | Radiographic diaphragm and method of making the same | Expired / Lapsed | 1954-01-21 | 1957-09-17 | 0 | Details |
| US2806961A | Crystals with small apertures | Expired / Lapsed | 1952-01-10 | 1957-09-17 | 1 | Details |
| US2805546A | Control system having dynamic limit controls | Expired / Lapsed | 1952-01-31 | 1957-09-10 | 0 | Details |
| US2804516A | Sump pump liquid level control switch | Expired / Lapsed | 1954-02-25 | 1957-08-27 | 0 | Details |
| US2803755A | Automatic inspection gage | Expired / Lapsed | 1954-12-16 | 1957-08-20 | 0 | Details |
| US2803614A | Tin compound as a curing agent for organopolysiloxanes | Expired / Lapsed | 1954-03-15 | 1957-08-20 | 2 | Details |
| US2803056A | Method of applying an elastic insulating tube to a conducto… | Expired / Lapsed | 1954-01-04 | 1957-08-20 | 0 | Details |
| US2803785A | Control system for a prime mover | Expired / Lapsed | 1949-12-14 | 1957-08-20 | 0 | Details |
| US2802897A | Insulated electrical conductors | Expired / Lapsed | 1952-07-18 | 1957-08-13 | 2 | Details |
| US2802178A | Motion detecting device | Expired / Lapsed | 1954-09-22 | 1957-08-06 | 0 | Details |
| US2801524A | Heat pump including hot gas defrosting means | Expired / Lapsed | 1954-07-22 | 1957-08-06 | 0 | Details |
| US2802117A | Semi-conductor network | Expired / Lapsed | 1954-05-27 | 1957-08-06 | 0 | Details |
| US2798966A | Surface inspection equipment | Expired / Lapsed | 1955-11-23 | 1957-07-09 | 0 | Details |
| US2797865A | Electronic generator of a function of two variables | Expired / Lapsed | 1953-09-11 | 1957-07-02 | 0 | Details |
| US2797336A | Photoelectric flame detector | Expired / Lapsed | 1954-07-28 | 1957-06-25 | 0 | Details |
| US2797403A | Recording system | Expired / Lapsed | 1950-02-10 | 1957-06-25 | 0 | Details |
| US2796531A | Gain stabilizing circuit for electron multiplier phototubes | Expired / Lapsed | 1954-05-17 | 1957-06-18 | 0 | Details |
| US2796556A | Phase comparator | Expired / Lapsed | 1953-11-30 | 1957-06-18 | 0 | Details |
| US2795512A | Electrostatic method and apparatus for lining molds | Expired / Lapsed | 1953-08-28 | 1957-06-11 | 1 | Details |
| US2794076A | Transistor amplifiers | Expired / Lapsed | 1952-05-05 | 1957-05-28 | 0 | Details |
| US2793197A | Food release composition consisting of two incompatable org… | Expired / Lapsed | 1956-01-10 | 1957-05-21 | 2 | Details |
| US2792499A | Sawtooth wave generator | Expired / Lapsed | 1956-04-13 | 1957-05-14 | 0 | Details |
| US2792494A | Semiconductor superregenerative detector | Expired / Lapsed | 1955-01-31 | 1957-05-14 | 0 | Details |
| US2792272A | Metallic bond | Expired / Lapsed | 1954-10-22 | 1957-05-14 | 1 | Details |
| US2791931A | Non-contacting width gage | Expired / Lapsed | 1951-08-03 | 1957-05-14 | 0 | Details |
| US2792271A | Method of making electric discharge device | Expired / Lapsed | 1951-07-20 | 1957-05-14 | 0 | Details |
| US2791473A | Elapsed time indicator | Expired / Lapsed | 1955-01-31 | 1957-05-07 | 0 | Details |
| US2790893A | Portable electric light | Expired / Lapsed | 1955-09-12 | 1957-04-30 | 0 | Details |
| US2789155A | Adhesive silicone rubber sheet material and tapes and metho… | Expired / Lapsed | 1955-07-13 | 1957-04-16 | 2 | Details |
| US2789062A | Transparent fluoride luminescent screen and method for prep… | Expired / Lapsed | 1952-04-03 | 1957-04-16 | 2 | Details |
| US2787707A | Pulse generators | Expired / Lapsed | 1953-06-16 | 1957-04-02 | 0 | Details |
| US2787727A | Electrical system | Expired / Lapsed | 1951-11-06 | 1957-04-02 | 0 | Details |
| US2786967A | Thyratron control circuit | Expired / Lapsed | 1953-07-17 | 1957-03-26 | 0 | Details |
| US2786966A | Thyratron control circuit | Expired / Lapsed | 1953-07-17 | 1957-03-26 | 0 | Details |
| US2784582A | Electrical control system for automatic washer | Expired / Lapsed | 1954-03-19 | 1957-03-12 | 0 | Details |
| US2784479A | Method of manufacturing rectifier plates in multiple | Expired / Lapsed | 1952-03-12 | 1957-03-12 | 2 | Details |
| US2783197A | Method of making broad area semiconductor devices | Expired / Lapsed | 1952-01-25 | 1957-02-26 | 2 | Details |
| US2783295A | Waveguide seal | Expired / Lapsed | 1952-01-18 | 1957-02-26 | 0 | Details |
| US2782327A | Dynamoelectric machine | Expired / Lapsed | 1954-10-27 | 1957-02-19 | 0 | Details |
| US2781054A | Self-operating check valve | Expired / Lapsed | 1952-09-23 | 1957-02-12 | 0 | Details |
| US2781447A | Binary digital computing and counting apparatus | Expired / Lapsed | 1951-06-27 | 1957-02-12 | 0 | Details |
| US2780752A | Semi-conductor network | Expired / Lapsed | 1954-06-16 | 1957-02-05 | 0 | Details |
| US2780786A | Four leg magnetic core | Expired / Lapsed | 1953-11-20 | 1957-02-05 | 0 | Details |
| US2780569A | Method of making p-nu junction semiconductor units | Expired / Lapsed | 1952-08-20 | 1957-02-05 | 2 | Details |
| US2780787A | Magnetic core construction | Expired / Lapsed | 1951-05-21 | 1957-02-05 | 0 | Details |
| US2779899A | Time delay control system | Expired / Lapsed | 1954-07-01 | 1957-01-29 | 0 | Details |
| US2779926A | Transformer with five-leg core | Expired / Lapsed | 1954-01-25 | 1957-01-29 | 0 | Details |
| US2778982A | Thyratron motor control limit circuit | Expired / Lapsed | 1955-09-28 | 1957-01-22 | 0 | Details |
| US2778980A | High power junction semiconductor device | Expired / Lapsed | 1954-08-30 | 1957-01-22 | 2 | Details |
| US2778212A | Water load responsive diaphragm operated control device for… | Expired / Lapsed | 1953-01-21 | 1957-01-22 | 0 | Details |
| US2777065A | Negative resistance oscillator | Expired / Lapsed | 1954-09-30 | 1957-01-08 | 0 | Details |
| US2776543A | Step-modulated control system for air conditioning apparatus | Expired / Lapsed | 1954-05-10 | 1957-01-08 | 0 | Details |
| US2776920A | Germanium-zinc alloy semi-conductors | Expired / Lapsed | 1952-11-05 | 1957-01-08 | 2 | Details |
| US2777084A | Plastic electrode structure for electron tubes | Expired / Lapsed | 1952-04-12 | 1957-01-08 | 0 | Details |
| US2776357A | Photosensitive layer cell | Expired / Lapsed | 1955-04-04 | 1957-01-01 | 0 | Details |
| US2774875A | Wave generating network | Expired / Lapsed | 1954-07-27 | 1956-12-18 | 0 | Details |
| US2774004A | Flexible electroluminescent laminated panel | Expired / Lapsed | 1953-04-08 | 1956-12-11 | 0 | Details |
| US2774013A | Electric discharge lamp | Expired / Lapsed | 1950-03-23 | 1956-12-11 | 0 | Details |
| US2771559A | Portable clock radio | Expired / Lapsed | 1956-01-25 | 1956-11-20 | 0 | Details |
| US2771521A | Remote control key switch | Expired / Lapsed | 1954-11-30 | 1956-11-20 | 0 | Details |
| US2769949A | Method and apparatus for motor speed regulation | Expired / Lapsed | 1954-03-23 | 1956-11-06 | 0 | Details |
| US2769926A | Non-linear resistance device | Expired / Lapsed | 1953-03-09 | 1956-11-06 | 0 | Details |
| US2769337A | Rebalance type flow meter | Expired / Lapsed | 1952-11-12 | 1956-11-06 | 0 | Details |
| US2768506A | Combined unloading and reversing valve for reversible refri… | Expired / Lapsed | 1954-10-06 | 1956-10-30 | 0 | Details |
| US2768345A | Magnetic amplifier circuit | Expired / Lapsed | 1950-03-01 | 1956-10-23 | 0 | Details |
| US2767296A | Control system for surface heating units | Expired / Lapsed | 1953-09-25 | 1956-10-16 | 0 | Details |
| US2767295A | Control system for surface heating units | Expired / Lapsed | 1953-09-25 | 1956-10-16 | 0 | Details |
| US2766654A | Exposure meter with incident light attachment | Expired / Lapsed | 1953-04-28 | 1956-10-16 | 0 | Details |
| US2765405A | Voltage level switching network | Expired / Lapsed | 1952-03-12 | 1956-10-02 | 0 | Details |
| US2765419A | Electroluminescent cell | Expired / Lapsed | 1951-11-03 | 1956-10-02 | 2 | Details |
| US2764720A | Follow-up control system | Expired / Lapsed | 1955-05-23 | 1956-09-25 | 0 | Details |
| US2764681A | Frequency stabilized and controlled oscillatory system | Expired / Lapsed | 1953-08-19 | 1956-09-25 | 0 | Details |
| US2764693A | Process and apparatus for image production and recordation | Expired / Lapsed | 1951-05-25 | 1956-09-25 | 0 | Details |
| US2763233A | Automatic machine for coating cathode ray tube bulbs | Expired / Lapsed | 1953-11-25 | 1956-09-18 | 0 | Details |
| US2763787A | Inspection device | Expired / Lapsed | 1953-04-23 | 1956-09-18 | 0 | Details |
| US2762964A | Regulating control system | Expired / Lapsed | 1953-12-14 | 1956-09-11 | 0 | Details |
| US2760070A | Amplitude stabilized transistor oscillator circuit | Expired / Lapsed | 1955-02-04 | 1956-08-21 | 0 | Details |
| US2758273A | Voltage regulated power supply | Expired / Lapsed | 1953-10-16 | 1956-08-07 | 0 | Details |
| US2758124A | Continuous hydrolysis of organohalogenosilanes | Expired / Lapsed | 1952-04-11 | 1956-08-07 | 2 | Details |
| US2757105A | Ceramic coating for compressor blades, coated blades and me… | Expired / Lapsed | 1955-02-28 | 1956-07-31 | 1 | Details |
| US2757323A | Full wave asymmetrical semi-conductor devices | Expired / Lapsed | 1952-02-07 | 1956-07-31 | 2 | Details |
| US2756625A | Gun sighting mechanism having gyroscopically controlled tra… | Expired / Lapsed | 1949-05-04 | 1956-07-31 | 0 | Details |
| US2756403A | Combined cord connector and strain relief | Expired / Lapsed | 1955-05-13 | 1956-07-24 | 0 | Details |
| US2756374A | Rectifier cell mounting | Expired / Lapsed | 1954-12-27 | 1956-07-24 | 2 | Details |
| US2755702A | Smoothness monitoring device | Expired / Lapsed | 1951-10-11 | 1956-07-24 | 0 | Details |
| US2756353A | Bender-mode piezoelectric device and method of making the s… | Expired / Lapsed | 1950-04-10 | 1956-07-24 | 2 | Details |
| US2755422A | Record-reproduce programming control system for electric mo… | Expired / Lapsed | 1953-08-14 | 1956-07-17 | 0 | Details |
| US2755160A | Magnetic tape recording device | Expired / Lapsed | 1953-03-30 | 1956-07-17 | 0 | Details |
| US2755255A | Electroluminescent zinc sulfide phosphor | Expired / Lapsed | 1953-01-30 | 1956-07-17 | 1 | Details |
| US2754311A | Aminomethyl siloxane compositions and their preparation | Expired / Lapsed | 1953-08-31 | 1956-07-10 | 2 | Details |
| US2754353A | Composite electrical insulation and method of fabrication | Expired / Lapsed | 1952-09-20 | 1956-07-10 | 2 | Details |
| CA527192A | Process of making porous metal bodies | Expired / Lapsed | — | 1956-07-03 | 0 | Details |
| US2753473A | Self-cleaning dynamoelectric machine | Expired / Lapsed | 1953-07-01 | 1956-07-03 | 0 | Details |
| US2752769A | Control circuits for automatic washing machines | Expired / Lapsed | 1952-11-14 | 1956-07-03 | 0 | Details |
| US2752553A | Magneto-responsive device control system | Expired / Lapsed | 1953-03-10 | 1956-06-26 | 0 | Details |
| US2752434A | Magneto-responsive device | Expired / Lapsed | 1952-03-22 | 1956-06-26 | 2 | Details |
| US2750519A | Automatic container inspection equipment | Expired / Lapsed | 1953-02-11 | 1956-06-12 | 0 | Details |
| US2750453A | Direct current amplifier | Expired / Lapsed | 1952-11-06 | 1956-06-12 | 0 | Details |
| US2748337A | Electrical regulators | Expired / Lapsed | 1953-05-14 | 1956-05-29 | 0 | Details |
| US2747373A | Quick-starting governing system for reheat turbine | Expired / Lapsed | 1952-09-24 | 1956-05-29 | 0 | Details |
| US2746834A | Recording device | Expired / Lapsed | 1953-09-17 | 1956-05-22 | 0 | Details |
| US2747104A | Interval timing apparatus | Expired / Lapsed | 1951-10-06 | 1956-05-22 | 0 | Details |
| US2745913A | Push button switch | Expired / Lapsed | 1954-12-23 | 1956-05-15 | 0 | Details |
| US2745943A | Combined heating and thermosensitive heating control units | Expired / Lapsed | 1954-12-22 | 1956-05-15 | 0 | Details |
| US2745944A | Combined heating and thermosensitive heating control units | Expired / Lapsed | 1954-12-16 | 1956-05-15 | 0 | Details |
| US2745898A | Insulated electric conductors | Expired / Lapsed | 1952-09-20 | 1956-05-15 | 2 | Details |
| US2745044A | Asymmetrically conductive apparatus | Expired / Lapsed | 1951-09-15 | 1956-05-08 | 2 | Details |
| US2744218A | Sealed rectifier unit and method of making the same | Expired / Lapsed | 1954-12-21 | 1956-05-01 | 0 | Details |
| US2744200A | Multiple masked photocell structure | Expired / Lapsed | 1952-03-07 | 1956-05-01 | 0 | Details |
| US2743355A | Automatic gain control circuits for pulse receivers | Expired / Lapsed | 1948-04-21 | 1956-04-24 | 0 | Details |
| US2742151A | Automatic container inspection equipment | Expired / Lapsed | 1954-03-19 | 1956-04-17 | 0 | Details |
| US2740875A | Photoelectric device | Expired / Lapsed | 1952-10-02 | 1956-04-03 | 2 | Details |
| US2739952A | Organopolysiloxanes stabilized with organophosphorus compou… | Expired / Lapsed | 1953-06-24 | 1956-03-27 | 1 | Details |
| US2738644A | Surge control for axial flow compressors | Expired / Lapsed | 1950-04-15 | 1956-03-20 | 0 | Details |
| US2738445A | Panelboard construction | Expired / Lapsed | 1952-02-26 | 1956-03-13 | 0 | Details |
| US2738444A | Panelboard construction | Expired / Lapsed | 1951-12-08 | 1956-03-13 | 0 | Details |
| US2737505A | Polymeric chlorotrifluoroethylene stabilized with small amo… | Expired / Lapsed | 1953-03-03 | 1956-03-06 | 2 | Details |
| US2736822A | Hall effect apparatus | Expired / Lapsed | 1952-05-09 | 1956-02-28 | 2 | Details |
| US2736787A | Arc welding apparatus | Expired / Lapsed | 1951-10-26 | 1956-02-28 | 0 | Details |
| US2731713A | Method of making a focused multicell | Expired / Lapsed | 1951-11-23 | 1956-01-24 | 0 | Details |
| US2730899A | Dynamic balancing apparatus | Expired / Lapsed | 1952-08-19 | 1956-01-17 | 0 | Details |
| US2730663A | Unilaterally conductive device | Expired / Lapsed | 1953-03-20 | 1956-01-10 | 0 | Details |
| US2730689A | Electric terminal connector | Expired / Lapsed | 1951-12-26 | 1956-01-10 | 0 | Details |
| US2729696A | Three conductor rip cord | Expired / Lapsed | 1955-06-29 | 1956-01-03 | 0 | Details |
| US2729735A | Electric range | Expired / Lapsed | 1952-09-18 | 1956-01-03 | 0 | Details |
| US2729757A | Ferroelectric ceramic composition and method of making same | Expired / Lapsed | 1951-06-09 | 1956-01-03 | 1 | Details |
| US2728651A | Diamond abrasive wheel | Expired / Lapsed | 1952-11-25 | 1955-12-27 | 1 | Details |
| US2728265A | Photoelectric measuring instrument | Expired / Lapsed | 1952-05-07 | 1955-12-27 | 0 | Details |
| US2728879A | Electrical coil | Expired / Lapsed | 1950-11-18 | 1955-12-27 | 0 | Details |
| US2728881A | Asymmetrically conductive devices | Expired / Lapsed | 1950-03-31 | 1955-12-27 | 0 | Details |
| US2727975A | Electric heating apparatus | Expired / Lapsed | 1953-12-14 | 1955-12-20 | 0 | Details |
| US2727199A | Variable frequency power control systems for a. c. motors | Expired / Lapsed | 1953-05-18 | 1955-12-13 | 0 | Details |
| US2727169A | Thermionic electrode pulse lamp structure | Expired / Lapsed | 1950-03-22 | 1955-12-13 | 0 | Details |
| US2727209A | Precision time interval measuring system | Expired / Lapsed | 1949-11-19 | 1955-12-13 | 0 | Details |
| US2726312A | Thermal control system | Expired / Lapsed | 1952-01-17 | 1955-12-06 | 0 | Details |
| US2725433A | Cyclic program timer | Expired / Lapsed | 1952-03-28 | 1955-11-29 | 0 | Details |
| US2725504A | Hall effect device | Expired / Lapsed | 1951-11-29 | 1955-11-29 | 2 | Details |
| US2724270A | Flowmeter | Expired / Lapsed | 1954-04-28 | 1955-11-22 | 0 | Details |
| US2724247A | Multi-purpose air conditioner | Expired / Lapsed | 1953-09-22 | 1955-11-22 | 0 | Details |
| US2724049A | High frequency communication system | Expired / Lapsed | 1952-03-26 | 1955-11-15 | 0 | Details |
| US2724077A | Asymmetrically conductive device | Expired / Lapsed | 1949-10-19 | 1955-11-15 | 0 | Details |
| US2722659A | Testing device | Expired / Lapsed | 1954-08-31 | 1955-11-01 | 0 | Details |
| US2722574A | Switch | Expired / Lapsed | 1952-05-31 | 1955-11-01 | 0 | Details |
| US2721950A | Electroluminescent cell | Expired / Lapsed | 1952-08-09 | 1955-10-25 | 2 | Details |
| US2721701A | Quality monitoring apparatus | Expired / Lapsed | 1951-11-13 | 1955-10-25 | 0 | Details |
| US2721977A | Variable amplitude oscillator | Expired / Lapsed | 1951-05-09 | 1955-10-25 | 0 | Details |
| US2720111A | Force measuring electric gauge | Expired / Lapsed | 1953-02-20 | 1955-10-11 | 0 | Details |
| US2719426A | Apparatus for measuring gas pressure in sealed vessels | Expired / Lapsed | 1952-04-23 | 1955-10-04 | 0 | Details |
| US2719937A | Cathode preheat conversion unit for fluorescent lamps | Expired / Lapsed | 1949-11-23 | 1955-10-04 | 0 | Details |
| US2719258A | Fast response rectifier circuit | Expired / Lapsed | 1954-10-13 | 1955-09-27 | 0 | Details |
| US2718544A | Jacketed multiple conductor cable | Expired / Lapsed | 1950-09-09 | 1955-09-20 | 0 | Details |
| US2717945A | Resistance temperature detector | Expired / Lapsed | 1954-03-30 | 1955-09-13 | 0 | Details |
| US2717343A | P-n junction transistor | Expired / Lapsed | 1954-06-25 | 1955-09-06 | 0 | Details |
| US2717132A | Automatic approach system | Expired / Lapsed | 1953-01-07 | 1955-09-06 | 0 | Details |
| US2717288A | Pneumatically controlled operating device for electric circ… | Expired / Lapsed | 1952-01-04 | 1955-09-06 | 0 | Details |
| US2714683A | Electroluminescent bulb | Expired / Lapsed | 1952-12-02 | 1955-08-02 | 2 | Details |
| US2714310A | Mass rate flowmeter | Expired / Lapsed | 1951-12-06 | 1955-08-02 | 0 | Details |
| US2714183A | Semi-conductor p-n junction units and method of making the … | Expired / Lapsed | 1952-12-29 | 1955-07-26 | 2 | Details |
| US2713697A | Molding machine | Expired / Lapsed | 1949-07-27 | 1955-07-26 | 2 | Details |
| US2713250A | Control for reversible refrigeration systems | Expired / Lapsed | 1954-01-29 | 1955-07-19 | 0 | Details |
| US2712563A | Thermoelectric element | Expired / Lapsed | 1952-04-23 | 1955-07-05 | 2 | Details |
| US2712052A | Water heater | Expired / Lapsed | 1953-05-27 | 1955-06-28 | 0 | Details |
| US2711399A | Silicone rubber with preaged carbon black | Expired / Lapsed | 1952-02-06 | 1955-06-21 | 2 | Details |
| US2711382A | Method of forming and applying metal heat exchange fins | Expired / Lapsed | 1951-02-08 | 1955-06-21 | 0 | Details |
| US2710290A | Organopolysiloxane-polytetrafluoroethylene mixtures | Expired / Lapsed | 1953-04-03 | 1955-06-07 | 2 | Details |
| US2709421A | Hydraulic amplifier | Expired / Lapsed | 1952-07-29 | 1955-05-31 | 0 | Details |
| US2709765A | Electroluminescent structure | Expired / Lapsed | 1951-11-23 | 1955-05-31 | 2 | Details |
| US2708247A | Hydrogen-filled electric discharge device | Expired / Lapsed | 1952-05-02 | 1955-05-10 | 0 | Details |
| US2707837A | Clothes drier | Expired / Lapsed | 1951-02-03 | 1955-05-10 | 0 | Details |
| US2707392A | Tool force gauge | Expired / Lapsed | 1951-09-14 | 1955-05-03 | 0 | Details |
| US2707177A | Ethoxyline-triallyl cyanurate resinous compositions | Expired / Lapsed | 1952-11-29 | 1955-04-26 | 2 | Details |
| US2707275A | Temperature responsive control device | Expired / Lapsed | 1951-11-24 | 1955-04-26 | 0 | Details |
| US2706792A | X-ray detection | Expired / Lapsed | 1954-07-07 | 1955-04-19 | 2 | Details |
| US2705767A | P-n junction transistor | Expired / Lapsed | 1952-11-18 | 1955-04-05 | 0 | Details |
| US2705404A | Cooling arrangement for condenser of refrigerating system | Expired / Lapsed | 1952-05-08 | 1955-04-05 | 0 | Details |
| US2704818A | Asymmetrically conductive device | Expired / Lapsed | 1947-04-24 | 1955-03-22 | 2 | Details |
| US2701329A | Load frequency control telemetering system | Expired / Lapsed | 1953-11-25 | 1955-02-01 | 0 | Details |
| US2701336A | Flaw detector | Expired / Lapsed | 1951-09-15 | 1955-02-01 | 0 | Details |
| US2701352A | Navigation apparatus | Expired / Lapsed | 1943-07-13 | 1955-02-01 | 0 | Details |
| US2700395A | Magnetic adjusting and stabilizing means for weight differe… | Expired / Lapsed | 1951-12-29 | 1955-01-25 | 0 | Details |
| US2700759A | Monitoring apparatus | Expired / Lapsed | 1951-08-11 | 1955-01-25 | 0 | Details |
| US2700212A | Electrical conductor | Expired / Lapsed | 1948-10-15 | 1955-01-25 | 2 | Details |
| US2700138A | Wave guide rotatable joint | Expired / Lapsed | 1950-03-14 | 1955-01-18 | 0 | Details |
| US2698915A | Phosphor screen | Expired / Lapsed | 1953-04-28 | 1955-01-04 | 0 | Details |
| US2697549A | Electronic multiradix counter of matrix type | Expired / Lapsed | 1950-03-18 | 1954-12-21 | 0 | Details |
| US2697354A | Erecting device for vertical gyroscopes | Expired / Lapsed | 1949-11-12 | 1954-12-21 | 0 | Details |
| US2697445A | Regulating device | Expired / Lapsed | 1949-01-29 | 1954-12-21 | 0 | Details |
| US2696587A | Electric regulator | Expired / Lapsed | 1945-01-30 | 1954-12-07 | 0 | Details |
| US2694785A | Electroluminescent oscillator | Expired / Lapsed | 1953-09-18 | 1954-11-16 | 0 | Details |
| US2693022A | Method of manufacturing whisker electrodes | Expired / Lapsed | 1950-10-06 | 1954-11-02 | 0 | Details |
| US2692727A | Apparatus for digital computation | Expired / Lapsed | 1949-08-27 | 1954-10-26 | 0 | Details |
| US2692370A | Optical system for oscillographs | Expired / Lapsed | 1950-06-27 | 1954-10-19 | 0 | Details |
| US2691007A | Unsaturated acidic polyester ethoxyline resinous compositio… | Expired / Lapsed | 1951-10-31 | 1954-10-05 | 2 | Details |
| US2691147A | Terminal block | Expired / Lapsed | 1951-04-02 | 1954-10-05 | 0 | Details |
| US2689930A | Semiconductor current control device | Expired / Lapsed | 1952-12-30 | 1954-09-21 | 0 | Details |
| US2687168A | Rocket reactant feed system | Expired / Lapsed | 1950-11-22 | 1954-08-24 | 0 | Details |
| US2686212A | Electric heating apparatus | Expired / Lapsed | 1953-08-03 | 1954-08-10 | 0 | Details |
| US2685530A | Method of preparing transparent luminescent screens | Expired / Lapsed | 1952-08-01 | 1954-08-03 | 2 | Details |
| US2683852A | Regulated power supply | Expired / Lapsed | 1949-12-30 | 1954-07-13 | 0 | Details |
| US2683866A | Piezoelectric crystal protective device | Expired / Lapsed | 1945-10-01 | 1954-07-13 | 0 | Details |
| US2682384A | Double hook wiring cleat | Expired / Lapsed | 1948-09-10 | 1954-06-29 | 0 | Details |
| US2682002A | Transformerless voltage multiplier circuits | Expired / Lapsed | 1952-07-25 | 1954-06-22 | 0 | Details |
| US2681571A | Electrical moisture indicator | Expired / Lapsed | 1949-03-15 | 1954-06-22 | 0 | Details |
| US2680824A | Electric discharge device | Expired / Lapsed | 1950-08-16 | 1954-06-08 | 0 | Details |
| US2679677A | Woven glass electrical insulating sheet | Expired / Lapsed | 1951-10-30 | 1954-06-01 | 0 | Details |
| US2679620A | Line follower | Expired / Lapsed | 1952-04-30 | 1954-05-25 | 0 | Details |
| US2679013A | Fourier curve analyzing and integrating apparatus | Expired / Lapsed | 1952-04-07 | 1954-05-18 | 0 | Details |
| US2677172A | Method of making sheathed electric heating units | Expired / Lapsed | 1948-10-16 | 1954-05-04 | 0 | Details |
| US2674917A | Noncontacting width gauge | Expired / Lapsed | 1951-03-06 | 1954-04-13 | 0 | Details |
| US2671037A | Method of washing dishes or the like | Expired / Lapsed | 1949-09-10 | 1954-03-02 | 2 | Details |
| US2669902A | Binocular optical system | Expired / Lapsed | 1950-09-26 | 1954-02-23 | 0 | Details |
| US2670010A | Means for establishing substantially uniform flow rate in c… | Expired / Lapsed | 1950-05-26 | 1954-02-23 | 0 | Details |
| US2669873A | Flowmeter | Expired / Lapsed | 1950-03-22 | 1954-02-23 | 0 | Details |
| US2669786A | Attitude indicator | Expired / Lapsed | 1946-09-17 | 1954-02-23 | 0 | Details |
| US2669126A | Electrical control arrangement | Expired / Lapsed | 1952-01-14 | 1954-02-16 | 0 | Details |
| US2669632A | Bus duct switch | Expired / Lapsed | 1949-04-16 | 1954-02-16 | 0 | Details |
| US2668923A | Current collector | Expired / Lapsed | 1951-07-14 | 1954-02-09 | 0 | Details |
| US2668420A | Combination water heating and room cooling system and metho… | Expired / Lapsed | 1951-03-20 | 1954-02-09 | 0 | Details |
| US2668930A | Protective system | Expired / Lapsed | 1950-10-18 | 1954-02-09 | 0 | Details |
| US2668883A | Amplifier for attenuating the higher frequency components o… | Expired / Lapsed | 1950-06-10 | 1954-02-09 | 0 | Details |
| US2668184A | Multiple photocell structure | Expired / Lapsed | 1952-02-15 | 1954-02-02 | 0 | Details |
| US2668262A | Asymmetrically conductive device | Expired / Lapsed | 1950-09-27 | 1954-02-02 | 0 | Details |
| US2667560A | Heating circuit control for electric appliances | Expired / Lapsed | 1952-12-05 | 1954-01-26 | 0 | Details |
| US2667464A | Insulation for electrical conductors | Expired / Lapsed | 1951-10-30 | 1954-01-26 | 1 | Details |
| US2667427A | Method of metalizing a ceramic member | Expired / Lapsed | 1951-07-27 | 1954-01-26 | 2 | Details |
| US2667548A | Circuit breaker trip control device | Expired / Lapsed | 1950-11-09 | 1954-01-26 | 0 | Details |
| US2667432A | Metalized ceramic | Expired / Lapsed | 1949-01-21 | 1954-01-26 | 2 | Details |
| US2666575A | Calculating device | Expired / Lapsed | 1949-10-26 | 1954-01-19 | 0 | Details |
| US2665567A | Evaporator defrosting arrangement | Expired / Lapsed | 1951-12-12 | 1954-01-12 | 0 | Details |
| US2666181A | Phase modulation system | Expired / Lapsed | 1949-08-31 | 1954-01-12 | 0 | Details |
| US2665558A | Two-temperature refrigeration system | Expired / Lapsed | 1946-08-23 | 1954-01-12 | 0 | Details |
| US2664530A | Autopilot control system | Expired / Lapsed | 1948-07-17 | 1953-12-29 | 0 | Details |
| US2663164A | Parallel compressor arrangement in refrigerating system | Expired / Lapsed | 1951-11-02 | 1953-12-22 | 0 | Details |
| US2660718A | Microwave protective system | Expired / Lapsed | 1949-12-30 | 1953-11-24 | 0 | Details |
| US2660540A | Metal vaporizer and method for vapor coating | Expired / Lapsed | 1949-08-18 | 1953-11-24 | 1 | Details |
| US2659679A | Phosphor coating process | Expired / Lapsed | 1951-11-23 | 1953-11-17 | 2 | Details |
| US2659801A | Temperature control device | Expired / Lapsed | 1950-10-06 | 1953-11-17 | 0 | Details |
| US2659874A | Collector plug for bus bar duct systems | Expired / Lapsed | 1949-04-01 | 1953-11-17 | 0 | Details |
| US2657580A | Multirange resistance thermometer | Expired / Lapsed | 1951-11-02 | 1953-11-03 | 0 | Details |
| US2657469A | Portable gear tooth checking instrument | Expired / Lapsed | 1949-12-30 | 1953-11-03 | 0 | Details |
| US2656948A | Weatherproof enclosure for electrical devices | Expired / Lapsed | 1949-03-31 | 1953-10-27 | 0 | Details |
| US2657150A | Method and masking shield for interiorly coating hollow art… | Expired / Lapsed | 1948-05-18 | 1953-10-27 | 2 | Details |
| US2656500A | Electronic motor control system | Expired / Lapsed | 1952-02-15 | 1953-10-20 | 0 | Details |
| US2656101A | Arbitrary function generator | Expired / Lapsed | 1951-04-26 | 1953-10-20 | 0 | Details |
| US2655639A | Electrical connector with insulation piercing means contact… | Expired / Lapsed | 1951-12-29 | 1953-10-13 | 0 | Details |
| US2654239A | Automatic washing machine electrical control system | Expired / Lapsed | 1951-04-24 | 1953-10-06 | 0 | Details |
| US2653889A | Bubbling reduction for high temperature resisting bonding | Expired / Lapsed | 1951-09-14 | 1953-09-29 | 4 | Details |
| US2652812A | Combined manual and automatic hydraulic servomotor apparatus | Expired / Lapsed | 1952-05-13 | 1953-09-22 | 0 | Details |
| US2653254A | Nonlinear resonant flip-flop circuit | Expired / Lapsed | 1952-04-23 | 1953-09-22 | 0 | Details |
| US2652902A | Bag support and motor shield for suction cleaners | Expired / Lapsed | 1951-12-07 | 1953-09-22 | 0 | Details |
| US2653249A | System and apparatus for the formation of optical images | Expired / Lapsed | 1950-11-30 | 1953-09-22 | 0 | Details |
| US2653309A | Object detection | Expired / Lapsed | 1950-03-09 | 1953-09-22 | 0 | Details |
| US2652621A | Method of making a unitary thermionic filament structure | Expired / Lapsed | 1949-02-25 | 1953-09-22 | 0 | Details |
| US2652555A | Wheel slip protective system | Expired / Lapsed | 1952-11-28 | 1953-09-15 | 0 | Details |
| US2652501A | Binary magnetic system | Expired / Lapsed | 1952-08-08 | 1953-09-15 | 0 | Details |
| US2651963A | Radiation beam pattern recorder | Expired / Lapsed | 1951-04-26 | 1953-09-15 | 0 | Details |
| US2652520A | Composite sintered metal powder article | Expired / Lapsed | 1949-12-24 | 1953-09-15 | 1 | Details |
| US2651704A | Temperature responsive system | Expired / Lapsed | 1951-09-24 | 1953-09-08 | 0 | Details |
| US2651718A | Switching device | Expired / Lapsed | 1951-09-19 | 1953-09-08 | 0 | Details |
| US2650753A | Turbomachine stator casing | Expired / Lapsed | 1947-06-11 | 1953-09-01 | 0 | Details |
| US2651007A | Electronic apparatus and method of mounting | Expired / Lapsed | 1945-10-01 | 1953-09-01 | 0 | Details |
| US2650310A | X-ray image intensification and method | Expired / Lapsed | 1952-10-10 | 1953-08-25 | 0 | Details |
| US2650350A | Angular modulating system | Expired / Lapsed | 1948-11-04 | 1953-08-25 | 0 | Details |
| US2650341A | Voltage regulator | Expired / Lapsed | 1948-07-01 | 1953-08-25 | 0 | Details |
| US2649101A | Double-wall portable shelter | Expired / Lapsed | 1952-04-09 | 1953-08-18 | 0 | Details |
| US2649107A | Hydraulic valve system | Expired / Lapsed | 1949-12-31 | 1953-08-18 | 0 | Details |
| US2648249A | Frequency modulated photometer | Expired / Lapsed | 1948-02-28 | 1953-08-11 | 0 | Details |
| US2647993A | High-frequency communication system | Expired / Lapsed | 1952-03-25 | 1953-08-04 | 0 | Details |
| US2648031A | Intermediate frequency transformer assembly | Expired / Lapsed | 1951-07-17 | 1953-08-04 | 0 | Details |
| US2647774A | Vacuum seal | Expired / Lapsed | 1949-10-05 | 1953-08-04 | 0 | Details |
| US2647033A | Spark stylus recording apparatus | Expired / Lapsed | 1952-06-11 | 1953-07-28 | 0 | Details |
| US2646673A | Clothes-washing machine | Expired / Lapsed | 1949-10-19 | 1953-07-28 | 0 | Details |
| US2647173A | Multiple feedback system | Expired / Lapsed | 1948-10-28 | 1953-07-28 | 0 | Details |
| US2645534A | Pressurized bearing | Expired / Lapsed | 1950-02-10 | 1953-07-14 | 0 | Details |
| US2644852A | Germanium photocell | Expired / Lapsed | 1951-10-19 | 1953-07-07 | 2 | Details |
| US2644906A | Electron beam discharge device | Expired / Lapsed | 1951-08-11 | 1953-07-07 | 0 | Details |
| US2644738A | Recording device | Expired / Lapsed | 1951-03-22 | 1953-07-07 | 0 | Details |
| US2644245A | Clothes drier | Expired / Lapsed | 1949-02-10 | 1953-07-07 | 0 | Details |
| US2643851A | Turbo-machine rotor with cooling means | Expired / Lapsed | 1948-05-27 | 1953-06-30 | 0 | Details |
| US2641696A | Binary numbers comparator | Expired / Lapsed | 1950-01-18 | 1953-06-09 | 0 | Details |
| US2640922A | Frequency response system | Expired / Lapsed | 1949-07-26 | 1953-06-02 | 0 | Details |
| US2639209A | Recording apparatus | Expired / Lapsed | 1949-09-29 | 1953-05-19 | 0 | Details |
| US2637334A | Fluid pressure servo mechanism | Expired / Lapsed | 1950-08-26 | 1953-05-05 | 0 | Details |
| US2635140A | Frequency-interlace television system | Expired / Lapsed | 1950-07-28 | 1953-04-14 | 0 | Details |
| US2633561A | Saturable core converter | Expired / Lapsed | 1952-06-05 | 1953-03-31 | 0 | Details |
| US2633457A | Basing cement | Expired / Lapsed | 1949-03-19 | 1953-03-31 | 2 | Details |
| US2632102A | Flame detection apparatus | Expired / Lapsed | 1949-11-19 | 1953-03-17 | 0 | Details |
| US2631188A | Electrical testing apparatus | Expired / Lapsed | 1949-10-06 | 1953-03-10 | 0 | Details |
| US2630969A | Decimal counting and indicating system | Expired / Lapsed | 1949-03-05 | 1953-03-10 | 0 | Details |
| US2629922A | Method of brazing resistor terminals | Expired / Lapsed | 1950-04-27 | 1953-03-03 | 0 | Details |
| US2628995A | Time delay means for controlling fluid pressure in electric… | Expired / Lapsed | 1948-10-30 | 1953-02-17 | 0 | Details |
| US2628178A | Oxygenated polymerizable acrylic acid type esters and metho… | Expired / Lapsed | 1950-07-29 | 1953-02-10 | 2 | Details |
| US2627202A | Apparatus for measuring flame temperatures | Expired / Lapsed | 1949-05-18 | 1953-02-03 | 0 | Details |
| US2626977A | Movable contact base | Expired / Lapsed | 1947-11-05 | 1953-01-27 | 0 | Details |
| US2625662A | Signal discriminator | Expired / Lapsed | 1950-12-30 | 1953-01-13 | 0 | Details |
| US2625017A | Refrigerator air circulation control | Expired / Lapsed | 1950-12-12 | 1953-01-13 | 0 | Details |
| US2625603A | Television pulse separation circuit | Expired / Lapsed | 1950-08-11 | 1953-01-13 | 0 | Details |
| US2625013A | Gas turbine nozzle structure | Expired / Lapsed | 1948-11-27 | 1953-01-13 | 0 | Details |
| US2625678A | Radiant energy navigational device | Expired / Lapsed | 1946-08-05 | 1953-01-13 | 0 | Details |
| US2624819A | Snap action switch | Expired / Lapsed | 1951-01-10 | 1953-01-06 | 0 | Details |
| US2624822A | Rheostat | Expired / Lapsed | 1950-07-29 | 1953-01-06 | 0 | Details |
| US2623262A | Weft straightener | Expired / Lapsed | 1951-03-22 | 1952-12-30 | 0 | Details |
| US2623976A | Automatic electric range control | Expired / Lapsed | 1949-12-24 | 1952-12-30 | 0 | Details |
| US2622707A | Liquid magnetic damper | Expired / Lapsed | 1950-02-28 | 1952-12-23 | 0 | Details |
| US2623087A | Fabricated terminal board | Expired / Lapsed | 1949-12-09 | 1952-12-23 | 0 | Details |
| US2622393A | Fuel regulating apparatus for aircraft gas turbine power pl… | Expired / Lapsed | 1945-07-19 | 1952-12-23 | 0 | Details |
| US2622023A | Titanium-base alloys | Expired / Lapsed | 1951-12-29 | 1952-12-16 | 2 | Details |
| US2621676A | Hydraulic pilot valve with reaction compensating means | Expired / Lapsed | 1950-11-16 | 1952-12-16 | 0 | Details |
| US2621672A | Liquid actuated prime mover regulating system with viscosit… | Expired / Lapsed | 1947-10-01 | 1952-12-16 | 0 | Details |
| US2620966A | Liquid piston gas pump | Expired / Lapsed | 1950-03-08 | 1952-12-09 | 0 | Details |
| DE857984C | Electrical resistance and process for its manufacture | Expired / Lapsed | 1950-07-19 | 1952-12-04 | 0 | Details |
| US2620449A | Dynamoelectric machine | Expired / Lapsed | 1951-01-18 | 1952-12-02 | 0 | Details |
| US2620405A | Magnetic recorder | Expired / Lapsed | 1950-03-28 | 1952-12-02 | 0 | Details |
| US2619573A | Temperature detector and lead assembly construction | Expired / Lapsed | 1952-01-30 | 1952-11-25 | 0 | Details |
| US2619326A | Fluid heating system, including a heat pump | Expired / Lapsed | 1949-11-29 | 1952-11-25 | 0 | Details |
| US2619068A | Illuminated multiscale dial structure | Expired / Lapsed | 1949-09-08 | 1952-11-25 | 0 | Details |
| US2618698A | Transducer and method of making the same | Expired / Lapsed | 1951-05-21 | 1952-11-18 | 0 | Details |
| US2617253A | Safety control system for cooling a gas turbine power plant… | Expired / Lapsed | 1950-09-23 | 1952-11-11 | 0 | Details |
| US2617867A | Alarm for power failure | Expired / Lapsed | 1949-12-24 | 1952-11-11 | 0 | Details |
| US2617090A | Saturable reactor apparatus | Expired / Lapsed | 1950-06-17 | 1952-11-04 | 0 | Details |
| US2616873A | Organo-phosphorus resinous compositions | Expired / Lapsed | 1948-03-23 | 1952-11-04 | 2 | Details |
| US2616115A | Brush belt removing means for vacuum cleaners | Expired / Lapsed | 1947-09-03 | 1952-11-04 | 0 | Details |
| US2617093A | Radio apparatus for indicating speed and course of objects | Expired / Lapsed | 1946-04-05 | 1952-11-04 | 0 | Details |
| US2615950A | Electric terminal connector | Expired / Lapsed | 1950-02-01 | 1952-10-28 | 0 | Details |
| US2615816A | Glass solder | Expired / Lapsed | 1949-11-10 | 1952-10-28 | 2 | Details |
| US2616072A | Excitation system | Expired / Lapsed | 1949-09-13 | 1952-10-28 | 0 | Details |
| US2615658A | Stabilization system in aircraft autopilot | Expired / Lapsed | 1948-07-17 | 1952-10-28 | 0 | Details |
| US2615060A | Crucible for the purification of molten substances | Expired / Lapsed | 1951-08-14 | 1952-10-21 | 2 | Details |
| US2615150A | Positional correspondence control system | Expired / Lapsed | 1950-10-12 | 1952-10-21 | 0 | Details |
| US2615154A | Automatic steering system | Expired / Lapsed | 1950-09-02 | 1952-10-21 | 0 | Details |
| US2614160A | Indicating system | Expired / Lapsed | 1951-07-28 | 1952-10-14 | 0 | Details |
| US2613504A | Compound turbine power plant with intercept valve | Expired / Lapsed | 1951-06-05 | 1952-10-14 | 0 | Details |
| US2614240A | Electric sequence and timing circuits | Expired / Lapsed | 1949-11-15 | 1952-10-14 | 0 | Details |
| US2613302A | Humidity indicator | Expired / Lapsed | 1949-06-24 | 1952-10-07 | 0 | Details |
| US2612550A | Voltage level selector circuit | Expired / Lapsed | 1950-09-27 | 1952-09-30 | 0 | Details |
| US2612109A | Electromagnetic pump | Expired / Lapsed | 1950-06-20 | 1952-09-30 | 0 | Details |
| US2612482A | Water-repellent compositions | Expired / Lapsed | 1950-03-17 | 1952-09-30 | 2 | Details |
| US2611854A | Control circuit with temperature and/or humidity compensati… | Expired / Lapsed | 1949-12-20 | 1952-09-23 | 0 | Details |
| US2611531A | Two-lamp wrapper | Expired / Lapsed | 1949-02-25 | 1952-09-23 | 0 | Details |
| US2611861A | Amplitude comparison circuit | Expired / Lapsed | 1948-11-26 | 1952-09-23 | 0 | Details |
| US2611025A | Selective signal transmission system | Expired / Lapsed | 1951-08-01 | 1952-09-16 | 0 | Details |
| US2610993A | Adjustable magnetic shunt for permanent magnet generators | Expired / Lapsed | 1951-07-12 | 1952-09-16 | 0 | Details |
| US2610102A | Function recorder | Expired / Lapsed | 1950-12-27 | 1952-09-09 | 0 | Details |
| US2610228A | Marker signal generator | Expired / Lapsed | 1949-09-02 | 1952-09-09 | 0 | Details |
| US2609835A | Adjustable magnetic pressure valve | Expired / Lapsed | 1948-12-27 | 1952-09-09 | 0 | Details |
| US2609470A | Resistance materials and elements | Expired / Lapsed | 1949-07-22 | 1952-09-02 | 2 | Details |
| US2608683A | Phase comparison object locating system | Expired / Lapsed | 1945-12-29 | 1952-08-26 | 0 | Details |
| US2606849A | Insulated electrical lead | Expired / Lapsed | 1949-05-24 | 1952-08-12 | 2 | Details |
| US2605671A | Spectrophotometer | Expired / Lapsed | 1948-02-28 | 1952-08-05 | 0 | Details |
| US2606092A | Sensitive moving chart graphic recorder | Expired / Lapsed | 1947-12-20 | 1952-08-05 | 0 | Details |
| US2604613A | Power boost control system | Expired / Lapsed | 1950-06-30 | 1952-07-22 | 0 | Details |
| US2604424A | Glass fiber reinforced crepe paper | Expired / Lapsed | 1948-12-18 | 1952-07-22 | 0 | Details |
| US2602368A | Color matching apparatus | Expired / Lapsed | 1950-09-13 | 1952-07-08 | 0 | Details |
| US2602140A | Coincidence timing system | Expired / Lapsed | 1950-03-24 | 1952-07-01 | 0 | Details |
| US2602132A | Range heater and control | Expired / Lapsed | 1949-12-24 | 1952-07-01 | 0 | Details |
| US2601336A | Process of adhering silicone rubber to copper | Expired / Lapsed | 1949-02-17 | 1952-06-24 | 2 | Details |
| US2601042A | Transformer | Expired / Lapsed | 1949-09-17 | 1952-06-17 | 0 | Details |
| US2600342A | Alternating current measurement bridge | Expired / Lapsed | 1950-09-20 | 1952-06-10 | 0 | Details |
| US2600348A | Two-stage hydraulic control valve | Expired / Lapsed | 1949-12-30 | 1952-06-10 | 0 | Details |
| US2600325A | Enclosed oscillating fan | Expired / Lapsed | 1948-11-13 | 1952-06-10 | 0 | Details |
| US2599266A | Electronic switching circuit | Expired / Lapsed | 1950-09-15 | 1952-06-03 | 0 | Details |
| US2599229A | Work coil | Expired / Lapsed | 1948-03-30 | 1952-06-03 | 0 | Details |
| US2598397A | Air-cooling attachment for warm air furnace systems | Expired / Lapsed | 1949-10-05 | 1952-05-27 | 0 | Details |
| US2598370A | Balanced phase detector | Expired / Lapsed | 1949-04-16 | 1952-05-27 | 0 | Details |
| US2598432A | Phase shifting network | Expired / Lapsed | 1949-03-29 | 1952-05-27 | 0 | Details |
| US2597617A | Method of depositing and impervious metal film on a granula… | Expired / Lapsed | 1946-11-09 | 1952-05-20 | 2 | Details |
| US2596118A | Recording device | Expired / Lapsed | 1949-08-20 | 1952-05-13 | 0 | Details |
| US2596752A | Magnetostriction measuring instrument | Expired / Lapsed | 1949-01-29 | 1952-05-13 | 0 | Details |
| US2595753A | Equalizer winding for five-legged three-phase cores | Expired / Lapsed | 1949-12-31 | 1952-05-06 | 0 | Details |
| US2595755A | Electromagnet | Expired / Lapsed | 1949-05-24 | 1952-05-06 | 0 | Details |
| US2595759A | Atomizing nozzle for spraying viscous liquids | Expired / Lapsed | 1948-11-30 | 1952-05-06 | 0 | Details |
| US2594939A | Hall effect converter construction | Expired / Lapsed | 1950-06-06 | 1952-04-29 | 0 | Details |
| US2594887A | Electromechanical trigonometric converter | Expired / Lapsed | 1949-04-21 | 1952-04-29 | 0 | Details |
| US2594979A | Resinous compositions and their use | Expired / Lapsed | 1949-01-19 | 1952-04-29 | 2 | Details |
| US2594838A | Molded tubular body | Expired / Lapsed | 1947-03-04 | 1952-04-29 | 0 | Details |
| US2594971A | Barrier nonreflectant to incident electromagnetic waves | Expired / Lapsed | 1945-03-09 | 1952-04-29 | 0 | Details |
| US2592342A | Wheel slip protective device | Expired / Lapsed | 1951-07-18 | 1952-04-08 | 0 | Details |
| US2592261A | Halophosphate phosphors | Expired / Lapsed | 1950-08-11 | 1952-04-08 | 1 | Details |
| US2592233A | Frost removing arrangement for refrigerator cabinets | Expired / Lapsed | 1949-10-14 | 1952-04-08 | 0 | Details |
| US2591734A | Planetary gear construction | Expired / Lapsed | 1949-01-03 | 1952-04-08 | 0 | Details |
| US2592322A | Rocket motor pumped supersonic wind tunnel | Expired / Lapsed | 1948-09-02 | 1952-04-08 | 0 | Details |
| US2591438A | Portable radio receiver | Expired / Lapsed | 1948-04-13 | 1952-04-01 | 0 | Details |
| US2590853A | Liquid fuel metering and spraying system | Expired / Lapsed | 1945-10-16 | 1952-04-01 | 0 | Details |
| US2590808A | Control system for laundry driers and the like | Expired / Lapsed | 1950-08-02 | 1952-03-25 | 0 | Details |
| US2589999A | Dynamoelectric machine | Expired / Lapsed | 1951-04-27 | 1952-03-18 | 0 | Details |
| US2590061A | Industrial liquid cooler automatic liquid level control | Expired / Lapsed | 1949-09-01 | 1952-03-18 | 0 | Details |
| US2589983A | Electrical indicator of mechanical expansion | Expired / Lapsed | 1947-11-05 | 1952-03-18 | 0 | Details |
| US2588926A | Temperature responsive control circuit | Expired / Lapsed | 1951-02-01 | 1952-03-11 | 0 | Details |
| US2588094A | Continuous wave detection system | Expired / Lapsed | 1949-09-08 | 1952-03-04 | 0 | Details |
| US2588151A | Apparatus for producing uniform foam structures | Expired / Lapsed | 1948-09-30 | 1952-03-04 | 2 | Details |
| US2587384A | Antihunting temperature sensitive detector | Expired / Lapsed | 1949-12-15 | 1952-02-26 | 0 | Details |
| US2587414A | Ultrasonic materials testing | Expired / Lapsed | 1949-08-13 | 1952-02-26 | 0 | Details |
| US2587399A | Momentary contact electric switch | Expired / Lapsed | 1948-12-13 | 1952-02-26 | 0 | Details |
| US2587331A | High-frequency electrical heating method and apparatus | Expired / Lapsed | 1947-08-08 | 1952-02-26 | 0 | Details |
| US2586559A | Multiple element electron lens arrangement | Expired / Lapsed | 1950-12-18 | 1952-02-19 | 0 | Details |
| US2586402A | Starting and operating circuits and devices for electric di… | Expired / Lapsed | 1948-05-20 | 1952-02-19 | 0 | Details |
| US2586348A | Apparatus for coating internal surfaces of hollow glassware | Expired / Lapsed | 1948-03-27 | 1952-02-19 | 0 | Details |
| US2586539A | Metal rectifier assembly | Expired / Lapsed | 1947-09-04 | 1952-02-19 | 0 | Details |
| US2585024A | Temperature compensated floated gyroscope | Expired / Lapsed | 1949-12-22 | 1952-02-12 | 0 | Details |
| US2584680A | Automatic testing apparatus | Expired / Lapsed | 1949-04-16 | 1952-02-05 | 0 | Details |
| US2584728A | Electronic relay | Expired / Lapsed | 1946-12-31 | 1952-02-05 | 0 | Details |
| US2583778A | Reproducing apparatus | Expired / Lapsed | 1950-05-04 | 1952-01-29 | 0 | Details |
| US2583785A | Biasing protective system for high-power oscillators | Expired / Lapsed | 1949-11-26 | 1952-01-29 | 0 | Details |
| US2582788A | Magnetic suspension for horizontal shafts | Expired / Lapsed | 1949-02-01 | 1952-01-15 | 0 | Details |
| US2582221A | Control system of the correspondence kind for movable membe… | Expired / Lapsed | 1948-12-16 | 1952-01-15 | 0 | Details |
| US2582305A | Airplane maneuvering system | Expired / Lapsed | 1948-07-17 | 1952-01-15 | 0 | Details |
| US2582088A | Two-stage hydraulic amplifier | Expired / Lapsed | 1947-11-01 | 1952-01-08 | 0 | Details |
| US2581209A | Magnetic wire footage meter | Expired / Lapsed | 1950-01-13 | 1952-01-01 | 0 | Details |
| US2581213A | Temperature responsive signaling and locating system | Expired / Lapsed | 1949-12-15 | 1952-01-01 | 0 | Details |
| US2581212A | Electrically heated fabric | Expired / Lapsed | 1949-05-04 | 1952-01-01 | 0 | Details |
| US2581196A | Electronic relay arrangement for protecting power systems | Expired / Lapsed | 1948-10-14 | 1952-01-01 | 0 | Details |
| US2579347A | Color temperature meter | Expired / Lapsed | 1950-01-20 | 1951-12-18 | 0 | Details |
| US2579329A | Trimethylol phenol compound and derivatives thereof | Expired / Lapsed | 1949-10-18 | 1951-12-18 | 2 | Details |
| US2579286A | Discriminator circuit | Expired / Lapsed | 1949-09-21 | 1951-12-18 | 0 | Details |
| US2577104A | Drier safety control | Expired / Lapsed | 1950-05-16 | 1951-12-04 | 0 | Details |
| US2576665A | Air circulating arrangement for refrigerators | Expired / Lapsed | 1949-12-08 | 1951-11-27 | 0 | Details |
| US2575756A | Exhaust machine | Expired / Lapsed | 1949-10-21 | 1951-11-20 | 0 | Details |
| US2575904A | Electric chopper circuit | Expired / Lapsed | 1949-09-16 | 1951-11-20 | 0 | Details |
| US2575906A | Adjustable magnetic pressure valve | Expired / Lapsed | 1948-12-27 | 1951-11-20 | 0 | Details |
| US2575134A | Radioactive source | Expired / Lapsed | 1950-12-06 | 1951-11-13 | 2 | Details |
| US2575086A | Magnetic valve | Expired / Lapsed | 1947-02-14 | 1951-11-13 | 0 | Details |
| US2574373A | Electric valve control circuit | Expired / Lapsed | 1946-07-22 | 1951-11-06 | 0 | Details |
| US2573402A | Band width indicator | Expired / Lapsed | 1948-10-12 | 1951-10-30 | 0 | Details |
| US2573523A | Feedback amplifier | Expired / Lapsed | 1946-06-24 | 1951-10-30 | 0 | Details |
| US2572597A | Porosity tester for coating materials | Expired / Lapsed | 1951-01-02 | 1951-10-23 | 0 | Details |
| US2570248A | Method of metalizing and bonding nonmetallic bodies | Expired / Lapsed | 1948-06-30 | 1951-10-09 | 2 | Details |
| US2570786A | Method of making dynamoelectric machine windings | Expired / Lapsed | 1948-05-29 | 1951-10-09 | 0 | Details |
| US2570129A | Supersonic wind tunnel | Expired / Lapsed | 1948-08-18 | 1951-10-02 | 0 | Details |
| US2570139A | Cathode-ray image presentation system | Expired / Lapsed | 1946-01-18 | 1951-10-02 | 0 | Details |
| US2569317A | Control system | Expired / Lapsed | 1949-12-30 | 1951-09-25 | 0 | Details |
| US2568449A | Electronic counter | Expired / Lapsed | 1947-12-05 | 1951-09-18 | 0 | Details |
| US2568448A | Parallax correction in color television | Expired / Lapsed | 1947-09-23 | 1951-09-18 | 0 | Details |
| US2567566A | X-ray apparatus | Expired / Lapsed | 1949-07-15 | 1951-09-11 | 0 | Details |
| US2567719A | Suspension of vinyl chloride polymer in polymerizable liquid | Expired / Lapsed | 1948-03-18 | 1951-09-11 | 2 | Details |
| US2567701A | Ultra high frequency coupling device for wave guides | Expired / Lapsed | 1944-06-02 | 1951-09-11 | 0 | Details |
| US2567012A | Combined pressure welding and arc welding method | Expired / Lapsed | 1948-08-07 | 1951-09-04 | 0 | Details |
| US2566876A | Phase shift system | Expired / Lapsed | 1946-04-17 | 1951-09-04 | 0 | Details |
| US2565478A | Temperature responsive control circuits | Expired / Lapsed | 1949-05-04 | 1951-08-28 | 0 | Details |
| US2566057A | Audio amplifier system | Expired / Lapsed | 1947-10-02 | 1951-08-28 | 0 | Details |
| US2566051A | Control valve | Expired / Lapsed | 1947-05-23 | 1951-08-28 | 0 | Details |
| US2566064A | Cabinet construction | Expired / Lapsed | 1946-10-21 | 1951-08-28 | 0 | Details |
| US2565323A | Annunciator alarm system | Expired / Lapsed | 1950-06-24 | 1951-08-21 | 0 | Details |
| US2565331A | Wide angle sweep yoke assembly | Expired / Lapsed | 1950-03-22 | 1951-08-21 | 0 | Details |
| US2565316A | Method of using dilatable sealing elements | Expired / Lapsed | 1946-08-17 | 1951-08-21 | 0 | Details |
| US2562697A | Pulse rate measurement | Expired / Lapsed | 1948-03-09 | 1951-07-31 | 0 | Details |
| US2561257A | Control for automatic washing machines | Expired / Lapsed | 1946-01-08 | 1951-07-17 | 0 | Details |
| US2560247A | Spark recorder apparatus | Expired / Lapsed | 1949-07-29 | 1951-07-10 | 0 | Details |
| US2560260A | Temperature compensated magnetic suspension | Expired / Lapsed | 1949-07-12 | 1951-07-10 | 0 | Details |
| US2558573A | Adjustable coupling system | Expired / Lapsed | 1949-10-12 | 1951-06-26 | 0 | Details |
| US2558592A | Prime mover regulator | Expired / Lapsed | 1949-03-30 | 1951-06-26 | 0 | Details |
| US2558563A | Piezoelectric strain gauge | Expired / Lapsed | 1948-10-29 | 1951-06-26 | 0 | Details |
| US2556972A | Computing device | Expired / Lapsed | 1950-11-03 | 1951-06-12 | 0 | Details |
| US2556864A | Coated grid for electron discharge tubes | Expired / Lapsed | 1950-09-27 | 1951-06-12 | 0 | Details |
| US2555999A | Reset circuit for eccles-jordan triggered multivibrator cir… | Expired / Lapsed | 1950-10-09 | 1951-06-05 | 0 | Details |
| US2555977A | Moisture content monitor | Expired / Lapsed | 1950-02-08 | 1951-06-05 | 0 | Details |
| US2555992A | Motor control system | Expired / Lapsed | 1950-02-03 | 1951-06-05 | 0 | Details |
| US2555978A | Air discharge register | Expired / Lapsed | 1949-02-19 | 1951-06-05 | 0 | Details |
| US2555017A | Electrode holder for gas blanketed electric arc weldings | Expired / Lapsed | 1949-08-18 | 1951-05-29 | 0 | Details |
| US2554994A | Electronic switching circuit | Expired / Lapsed | 1949-02-16 | 1951-05-29 | 0 | Details |
| US2555005A | Reciprocating compressor with unloading and capacity modula… | Expired / Lapsed | 1948-01-31 | 1951-05-29 | 0 | Details |
| US2555004A | Reciprocating compressor with unloading and capacity modula… | Expired / Lapsed | 1948-01-31 | 1951-05-29 | 0 | Details |
| US2554977A | Electronic voltage regulator | Expired / Lapsed | 1946-03-27 | 1951-05-29 | 0 | Details |
| US2554225A | Calibration of photovoltaic cells | Expired / Lapsed | 1949-11-26 | 1951-05-22 | 0 | Details |
| US2554172A | Linear sweep wave generator | Expired / Lapsed | 1948-03-06 | 1951-05-22 | 0 | Details |
| US2553591A | Electric induction apparatus | Expired / Lapsed | 1946-08-16 | 1951-05-22 | 0 | Details |
| US2553324A | Wide band audio and video transformer | Expired / Lapsed | 1949-07-27 | 1951-05-15 | 0 | Details |
| US2553323A | Voltage rectifier circuit | Expired / Lapsed | 1948-12-02 | 1951-05-15 | 0 | Details |
| US2553291A | Pressure temperature relay | Expired / Lapsed | 1948-06-18 | 1951-05-15 | 0 | Details |
| US2553294A | Ratio circuit | Expired / Lapsed | 1945-12-29 | 1951-05-15 | 0 | Details |
| US2553314A | Method of rendering materials water repellent | Expired / Lapsed | 1944-07-01 | 1951-05-15 | 1 | Details |
| US2552206A | Thyratron control system for series motors | Expired / Lapsed | 1948-10-21 | 1951-05-08 | 0 | Details |
| US2552189A | Paper weight indicating equipment | Expired / Lapsed | 1946-04-27 | 1951-05-08 | 0 | Details |
| US2551229A | Variable area nozzle and fluid injection control for turboj… | Expired / Lapsed | 1949-10-14 | 1951-05-01 | 0 | Details |
| US2551265A | Hall effect regulator and balancing system | Expired / Lapsed | 1949-07-28 | 1951-05-01 | 0 | Details |
| US2551291A | Electric voltage, current, and phaseangle measuring instrum… | Expired / Lapsed | 1946-12-17 | 1951-05-01 | 0 | Details |
| US2550492A | Hall effect alternating current measuring apparatus | Expired / Lapsed | 1950-05-27 | 1951-04-24 | 0 | Details |
| US2550506A | Automatic selective switching equipment | Expired / Lapsed | 1950-05-09 | 1951-04-24 | 0 | Details |
| US2548855A | Phase shifting apparatus | Expired / Lapsed | 1946-12-11 | 1951-04-17 | 0 | Details |
| US2549432A | Electric blanket control | Expired / Lapsed | 1946-01-09 | 1951-04-17 | 0 | Details |
| US2549473A | Radar equipment calibrating system | Expired / Lapsed | 1945-01-30 | 1951-04-17 | 0 | Details |
| US2548590A | Noncontacting width gauge | Expired / Lapsed | 1950-04-01 | 1951-04-10 | 0 | Details |
| US2548592A | Resistance strain gauge and method for making same | Expired / Lapsed | 1949-08-26 | 1951-04-10 | 0 | Details |
| US2548581A | Magnetic switching device | Expired / Lapsed | 1949-03-04 | 1951-04-10 | 0 | Details |
| US2547623A | Spot detector recorder | Expired / Lapsed | 1948-12-27 | 1951-04-03 | 0 | Details |
| US2547658A | Electric switch contact | Expired / Lapsed | 1947-02-24 | 1951-04-03 | 0 | Details |
| US2547625A | Temperature measuring apparatus | Expired / Lapsed | 1946-07-16 | 1951-04-03 | 0 | Details |
| US2546783A | Speed control system for direct-current motors | Expired / Lapsed | 1948-10-12 | 1951-03-27 | 0 | Details |
| US2545909A | Apparatus for applying emission material to cathodes | Expired / Lapsed | 1948-12-22 | 1951-03-20 | 0 | Details |
| US2545896A | Electric lamp, light diffusing coating therefor and method … | Expired / Lapsed | 1948-01-07 | 1951-03-20 | 0 | Details |
| US2546039A | Regulating system | Expired / Lapsed | 1946-04-06 | 1951-03-20 | 0 | Details |
| US2545369A | Hall effect frequency meter | Expired / Lapsed | 1949-03-09 | 1951-03-13 | 0 | Details |
| US2545353A | Temperature control system | Expired / Lapsed | 1945-05-23 | 1951-03-13 | 0 | Details |
| US2543630A | X-ray monochromator | Expired / Lapsed | 1950-04-12 | 1951-02-27 | 0 | Details |
| US2543622A | Traction vehicle wheel slip control system | Expired / Lapsed | 1949-08-18 | 1951-02-27 | 0 | Details |
| US2543640A | Phase comparator utilizing hall effect | Expired / Lapsed | 1949-05-25 | 1951-02-27 | 0 | Details |
| US2542638A | Frequency responsive apparatus | Expired / Lapsed | 1949-03-29 | 1951-02-20 | 0 | Details |
| US2542299A | Brightness meter | Expired / Lapsed | 1948-12-02 | 1951-02-20 | 0 | Details |
| US2542311A | Photographic spotlight having a flash tube and a modeling l… | Expired / Lapsed | 1946-07-06 | 1951-02-20 | 0 | Details |
| US2541832A | Electric current rectifier | Expired / Lapsed | 1949-07-22 | 1951-02-13 | 2 | Details |
| US2540813A | Angle modulation demodulator | Expired / Lapsed | 1947-11-12 | 1951-02-06 | 0 | Details |
| US2540807A | Center of gravity indicator | Expired / Lapsed | 1944-05-25 | 1951-02-06 | 0 | Details |
| US2539818A | Frequency modulation detector | Expired / Lapsed | 1948-10-28 | 1951-01-30 | 0 | Details |
| US2539218A | Temperature compensating system for oscillators | Expired / Lapsed | 1949-06-21 | 1951-01-23 | 0 | Details |
| US2538642A | Thermopile flame detector for combustion devices | Expired / Lapsed | 1949-08-31 | 1951-01-16 | 0 | Details |
| US2538577A | Sparkless camera shutter and flash tube synchronizer | Expired / Lapsed | 1948-05-08 | 1951-01-16 | 0 | Details |
| US2537770A | Programming control system | Expired / Lapsed | 1949-02-17 | 1951-01-09 | 0 | Details |
| US2537767A | Phase shifting control circuit | Expired / Lapsed | 1948-09-25 | 1951-01-09 | 0 | Details |
| US2536805A | Hall effect telemetering transmitter | Expired / Lapsed | 1947-08-16 | 1951-01-02 | 0 | Details |
| US2535690A | Fibrous dielectric compositions | Expired / Lapsed | 1947-08-02 | 1950-12-26 | 4 | Details |
| US2534973A | Cooling apparatus | Expired / Lapsed | 1949-03-02 | 1950-12-19 | 0 | Details |
| US2534142A | Bearing mounting | Expired / Lapsed | 1949-07-20 | 1950-12-12 | 0 | Details |
| US2534097A | Top burner electric range automatic cooking | Expired / Lapsed | 1948-06-03 | 1950-12-12 | 0 | Details |
| US2534119A | High-potential coil | Expired / Lapsed | 1948-01-26 | 1950-12-12 | 0 | Details |
| US2532817A | Apparatus for analyzing fluids by microwave absorption | Expired / Lapsed | 1949-12-30 | 1950-12-05 | 0 | Details |
| US2532816A | Air circulating arrangement for refrigerators | Expired / Lapsed | 1949-11-16 | 1950-12-05 | 0 | Details |
| US2531153A | Traffic signal control system | Expired / Lapsed | 1949-12-29 | 1950-11-21 | 0 | Details |
| US2531188A | Automatic pitch control | Expired / Lapsed | 1949-11-26 | 1950-11-21 | 0 | Details |
| US2531000A | Erythemal meter | Expired / Lapsed | 1947-12-24 | 1950-11-21 | 0 | Details |
| US2531122A | Frequency responsive protective arrangement for ultra high … | Expired / Lapsed | 1945-08-06 | 1950-11-21 | 0 | Details |
| US2531156A | Method of insulating hollow core conductors | Expired / Lapsed | 1945-04-17 | 1950-11-21 | 0 | Details |
| US2530022A | Integrating load meter for rotating shafts | Expired / Lapsed | 1948-08-26 | 1950-11-14 | 0 | Details |
| US2530003A | Electric control device | Expired / Lapsed | 1947-02-21 | 1950-11-14 | 0 | Details |
| US2529161A | Register control system | Expired / Lapsed | 1948-04-30 | 1950-11-07 | 0 | Details |
| US2529144A | Resistance material | Expired / Lapsed | 1945-03-29 | 1950-11-07 | 2 | Details |
| US2528243A | Electric control element | Expired / Lapsed | 1949-10-12 | 1950-10-31 | 0 | Details |
| US2528222A | Combination television and frequency modulation receiver | Expired / Lapsed | 1948-12-29 | 1950-10-31 | 0 | Details |
| US2528252A | Rate of change and maximum limit device for regulating syst… | Expired / Lapsed | 1948-05-06 | 1950-10-31 | 0 | Details |
| US2528235A | Coating and impregnating compositions and articles produced… | Expired / Lapsed | 1945-06-26 | 1950-10-31 | 2 | Details |
| US2528248A | Wide band flexible section for wave guides | Expired / Lapsed | 1945-02-14 | 1950-10-31 | 0 | Details |
| US2526421A | Automatic timing and recycling apparatus | Expired / Lapsed | 1949-06-10 | 1950-10-17 | 0 | Details |
| US2526379A | Defrosting arrangement for refrigerating systems | Expired / Lapsed | 1949-03-09 | 1950-10-17 | 0 | Details |
| US2526383A | Wave guide mode converter | Expired / Lapsed | 1948-01-23 | 1950-10-17 | 0 | Details |
| US2526444A | Control for automatic washing machines | Expired / Lapsed | 1946-01-08 | 1950-10-17 | 0 | Details |
| US2526314A | Radio detection and ranging system employing multiple scan | Expired / Lapsed | 1945-08-17 | 1950-10-17 | 0 | Details |
| US2525445A | Photometer | Expired / Lapsed | 1949-11-10 | 1950-10-10 | 0 | Details |
| US2525456A | Rotor for dynamoelectric machines | Expired / Lapsed | 1949-06-01 | 1950-10-10 | 0 | Details |
| US2525451A | Regulating system | Expired / Lapsed | 1949-05-21 | 1950-10-10 | 0 | Details |
| US2525454A | Electrical high-frequency pulse translating network | Expired / Lapsed | 1948-06-24 | 1950-10-10 | 0 | Details |
| US2525022A | Circular lighting fixture | Expired / Lapsed | 1946-10-23 | 1950-10-10 | 0 | Details |
| US2525448A | Phase indicating instrument | Expired / Lapsed | 1945-09-01 | 1950-10-10 | 0 | Details |
| US2524522A | Flexible hose of extrudable elastomeric composition | Expired / Lapsed | 1948-08-24 | 1950-10-03 | 0 | Details |
| US2523770A | Releasable hose coupling | Expired / Lapsed | 1948-07-22 | 1950-09-26 | 0 | Details |
| US2523328A | Cathode-ray mapping system | Expired / Lapsed | 1948-06-30 | 1950-09-26 | 0 | Details |
| US2523027A | Method and apparatus for effecting electric power transform… | Expired / Lapsed | 1950-01-20 | 1950-09-19 | 0 | Details |
| US2523043A | Frequency modulation receiver system | Expired / Lapsed | 1948-03-27 | 1950-09-19 | 0 | Details |
| US2523065A | Pigmented coating compositions containing liquid alkyl poly… | Expired / Lapsed | 1947-12-29 | 1950-09-19 | 2 | Details |
| US2523082A | Surface coated electrical bushing | Expired / Lapsed | 1946-11-30 | 1950-09-19 | 0 | Details |
| US2523037A | Method of making an organopolysiloxane insulated copper con… | Expired / Lapsed | 1946-08-03 | 1950-09-19 | 2 | Details |
| US2522240A | Antihunt feedback generator for recorders | Expired / Lapsed | 1947-07-23 | 1950-09-12 | 0 | Details |
| US2521513A | Stationary induction apparatus | Expired / Lapsed | 1948-08-18 | 1950-09-05 | 0 | Details |
| US2521528A | Elastic hydrocarbon-substituted polysiloxanes and tertiary … | Expired / Lapsed | 1947-07-24 | 1950-09-05 | 2 | Details |
| US2520582A | Rotating machine | Expired / Lapsed | 1947-02-25 | 1950-08-29 | 0 | Details |
| US2519898A | Depth measuring equipment | Expired / Lapsed | 1949-07-27 | 1950-08-22 | 0 | Details |
| US2519083A | Time division pulse multiplex system | Expired / Lapsed | 1949-08-08 | 1950-08-15 | 0 | Details |
| US2519030A | Mixer circuit | Expired / Lapsed | 1946-10-29 | 1950-08-15 | 0 | Details |
| US2518115A | Amplification system for noncontacting thickness gauges | Expired / Lapsed | 1949-03-10 | 1950-08-08 | 0 | Details |
| US2518160A | Curing of hydrocarbon-substituted polysiloxane resins with … | Expired / Lapsed | 1947-09-18 | 1950-08-08 | 1 | Details |
| US2518142A | Tool for handling snap rings | Expired / Lapsed | 1946-12-14 | 1950-08-08 | 0 | Details |
| US2518149A | Flowmeter | Expired / Lapsed | 1946-11-15 | 1950-08-08 | 0 | Details |
| US2518118A | Electronic control circuits | Expired / Lapsed | 1944-09-12 | 1950-08-08 | 0 | Details |
| US2516563A | Magnetic amplifier for inductive loads | Expired / Lapsed | 1948-04-19 | 1950-07-25 | 0 | Details |
| US2516567A | Vertical shaft motor | Expired / Lapsed | 1945-12-15 | 1950-07-25 | 0 | Details |
| US2515763A | Direct current restoration circuit for television | Expired / Lapsed | 1948-10-22 | 1950-07-18 | 0 | Details |
| US2515768A | Brush holder and brush | Expired / Lapsed | 1948-02-06 | 1950-07-18 | 0 | Details |
| US2515706A | Method of sealing metal to glass | Expired / Lapsed | 1943-10-16 | 1950-07-18 | 2 | Details |
| US2514924A | Pulse echo detection of moving targets | Expired / Lapsed | 1946-03-27 | 1950-07-11 | 0 | Details |
| US2513953A | Electric switch | Expired / Lapsed | 1947-10-15 | 1950-07-04 | 0 | Details |
| US2513965A | Coil retaining means | Expired / Lapsed | 1946-08-20 | 1950-07-04 | 0 | Details |
| US2513924A | Chloromethyl silicon compounds | Expired / Lapsed | 1945-05-05 | 1950-07-04 | 2 | Details |
| US2512325A | Hall effect commutating apparatus | Expired / Lapsed | 1949-05-25 | 1950-06-20 | 0 | Details |
| US2511680A | Electronic relay arrangement for protecting power systems | Expired / Lapsed | 1948-10-14 | 1950-06-13 | 0 | Details |
| US2509742A | Voltage limiting circuit | Expired / Lapsed | 1947-10-15 | 1950-05-30 | 0 | Details |
| US2509730A | Synchronizing system | Expired / Lapsed | 1946-05-01 | 1950-05-30 | 0 | Details |
| US2509005A | Flashtube triggering circuits | Expired / Lapsed | 1949-10-17 | 1950-05-23 | 0 | Details |
| US2509017A | Magnetic recording apparatus | Expired / Lapsed | 1945-03-21 | 1950-05-23 | 0 | Details |
| US2507225A | Wide band antenna structure | Expired / Lapsed | 1946-04-11 | 1950-05-09 | 0 | Details |
| US2507200A | Process for rendering materials water-repellent and composi… | Expired / Lapsed | 1945-02-10 | 1950-05-09 | 4 | Details |
| US2507211A | Pulse receiver circuit | Expired / Lapsed | 1942-12-24 | 1950-05-09 | 0 | Details |
| US2506384A | Measuring circuits | Expired / Lapsed | 1949-02-03 | 1950-05-02 | 0 | Details |
| US2506368A | Vehicole actuated traffic controller | Expired / Lapsed | 1946-12-24 | 1950-05-02 | 0 | Details |
| US2505565A | Control circuit | Expired / Lapsed | 1946-11-14 | 1950-04-25 | 0 | Details |
| US2505577A | Vane controlled oscillator | Expired / Lapsed | 1946-08-15 | 1950-04-25 | 0 | Details |
| US2505521A | Age indicating device for electrical apparatus | Expired / Lapsed | 1944-03-01 | 1950-04-25 | 0 | Details |
| US2505534A | Device for controlling the propagation of energy in a wave … | Expired / Lapsed | 1943-04-27 | 1950-04-25 | 0 | Details |
| US2504663A | Automatic frequency control for television receivers | Expired / Lapsed | 1947-11-12 | 1950-04-18 | 0 | Details |
| US2504772A | Electrical detector of vapors and the like | Expired / Lapsed | 1947-07-08 | 1950-04-18 | 0 | Details |
| US2504549A | Starting and operating circuit for electric discharge devic… | Expired / Lapsed | 1947-02-28 | 1950-04-18 | 0 | Details |
| US2504699A | Tube protective circuit | Expired / Lapsed | 1946-04-27 | 1950-04-18 | 0 | Details |
| US2504126A | Ceilometer recorder | Expired / Lapsed | 1945-04-12 | 1950-04-18 | 0 | Details |
| US2504744A | Glass fiber sheet material | Expired / Lapsed | 1944-06-03 | 1950-04-18 | 0 | Details |
| US2503023A | Photoelectric motion transmitting device | Expired / Lapsed | 1947-10-21 | 1950-04-04 | 0 | Details |
| US2503075A | X-ray tube energizing circuit | Expired / Lapsed | 1947-02-15 | 1950-04-04 | 0 | Details |
| US2503062A | X-ray absorption photometer | Expired / Lapsed | 1946-11-14 | 1950-04-04 | 0 | Details |
| US2501543A | Frequency regulating system | Expired / Lapsed | 1947-11-29 | 1950-03-21 | 0 | Details |
| US2501547A | Vest pocket exposure meter having louvers, light cell, and … | Expired / Lapsed | 1947-08-29 | 1950-03-21 | 0 | Details |
| US2500752A | High-frequency dielectric heating in a resonant chamber | Expired / Lapsed | 1946-06-01 | 1950-03-14 | 0 | Details |
| US2499977A | Method of forming grid-like structures | Expired / Lapsed | 1945-11-14 | 1950-03-07 | 0 | Details |
| US2499178A | Curve follower | Expired / Lapsed | 1948-11-18 | 1950-02-28 | 0 | Details |
| US2499208A | Thermally actuated switch | Expired / Lapsed | 1948-04-21 | 1950-02-28 | 0 | Details |
| US2497702A | Pressure responsive indicating device | Expired / Lapsed | 1948-11-17 | 1950-02-14 | 0 | Details |
| US2497691A | Limiting amplifier system | Expired / Lapsed | 1948-01-16 | 1950-02-14 | 0 | Details |
| US2497670A | High-frequency heating and compression apparatus | Expired / Lapsed | 1946-06-01 | 1950-02-14 | 0 | Details |
| US2497496A | Electrode structure for electric discharge devices or lamps | Expired / Lapsed | 1946-03-30 | 1950-02-14 | 0 | Details |
| US2497660A | Leakage minimizing shield for electron discharge devices | Expired / Lapsed | 1945-06-18 | 1950-02-14 | 0 | Details |
| US2496868A | Polymers of 3-vinylpyrene | Expired / Lapsed | 1948-05-13 | 1950-02-07 | 2 | Details |
| US2495916A | Remote control receiver | Expired / Lapsed | 1944-10-07 | 1950-01-31 | 0 | Details |
| US2495917A | Remote-control system | Expired / Lapsed | 1944-10-07 | 1950-01-31 | 0 | Details |
| US2494870A | Apparatus for sealing glass and metal members | Expired / Lapsed | 1944-02-17 | 1950-01-17 | 0 | Details |
| US2495115A | Keyed oscillator circuit | Expired / Lapsed | 1943-11-30 | 1950-01-17 | 0 | Details |
| US2493745A | Method of making electrical indicators of mechanical expans… | Expired / Lapsed | 1947-11-05 | 1950-01-10 | 0 | Details |
| US2494352A | Electronic interval timer | Expired / Lapsed | 1945-02-28 | 1950-01-10 | 0 | Details |
| US2494339A | Noise-reducing pulse-echo locating equipment | Expired / Lapsed | 1943-07-21 | 1950-01-10 | 0 | Details |
| US2492736A | Pulse length modulation system | Expired / Lapsed | 1949-02-26 | 1949-12-27 | 0 | Details |
| US2492769A | Receptacle mounting and closure fastener | Expired / Lapsed | 1949-02-16 | 1949-12-27 | 0 | Details |
| US2492749A | High-speed sequence control | Expired / Lapsed | 1948-09-08 | 1949-12-27 | 0 | Details |
| US2492768A | Cloud moisture meter | Expired / Lapsed | 1947-09-18 | 1949-12-27 | 0 | Details |
| US2492772A | Loop antenna | Expired / Lapsed | 1946-05-09 | 1949-12-27 | 0 | Details |
| US2492766A | Supervisory control system | Expired / Lapsed | 1946-02-27 | 1949-12-27 | 0 | Details |
| US2492731A | Tracer control system | Expired / Lapsed | 1944-08-14 | 1949-12-27 | 0 | Details |
| US2491848A | Method of manufacturing a glass blank | Expired / Lapsed | 1947-08-01 | 1949-12-20 | 0 | Details |
| US2491854A | Starting strip for electric discharge devices | Expired / Lapsed | 1946-04-06 | 1949-12-20 | 0 | Details |
| US2491794A | Variable resistance phonograph pickup | Expired / Lapsed | 1944-11-28 | 1949-12-20 | 0 | Details |
| US2491314A | Turbogenerator cooling system | Expired / Lapsed | 1948-05-11 | 1949-12-13 | 0 | Details |
| US2491305A | Constant current regulator using a permanent magnet as a st… | Expired / Lapsed | 1948-01-22 | 1949-12-13 | 0 | Details |
| US2489920A | Metal detector | Expired / Lapsed | 1946-07-03 | 1949-11-29 | 0 | Details |
| US2488733A | Alkaline earth halophosphate phosphors | Expired / Lapsed | 1947-07-16 | 1949-11-22 | 0 | Details |
| US2488731A | Electron-emitting electrode for electric discharge tubes | Expired / Lapsed | 1946-04-27 | 1949-11-22 | 0 | Details |
| US2488269A | Noncontacting thickness gauge | Expired / Lapsed | 1948-06-19 | 1949-11-15 | 0 | Details |
| US2488277A | Magnetic wire footage meter | Expired / Lapsed | 1948-06-15 | 1949-11-15 | 0 | Details |
| US2487509A | Combination power cord and carrying strap for portable radi… | Expired / Lapsed | 1948-10-06 | 1949-11-08 | 0 | Details |
| US2487603A | Circuits for comparing electrical quantities | Expired / Lapsed | 1947-04-11 | 1949-11-08 | 0 | Details |
| US2485621A | Washing machine | Expired / Lapsed | 1944-08-25 | 1949-10-25 | 0 | Details |
| US2485374A | Turbine-generator load control system | Expired / Lapsed | 1947-09-27 | 1949-10-18 | 0 | Details |
| US2485395A | Pulse generating circuit | Expired / Lapsed | 1945-04-11 | 1949-10-18 | 0 | Details |
| US2484585A | Thermal responsive resistance device | Expired / Lapsed | 1948-12-02 | 1949-10-11 | 0 | Details |
| US2484575A | Phase controled switching system | Expired / Lapsed | 1943-03-20 | 1949-10-11 | 0 | Details |
| US2483940A | Method of making lead-in seals | Expired / Lapsed | 1946-12-03 | 1949-10-04 | 0 | Details |
| US2483140A | Cathode-ray oscillographic apparatus | Expired / Lapsed | 1948-11-02 | 1949-09-27 | 0 | Details |
| US2483158A | Liquid organo-substituted polysiloxanes | Expired / Lapsed | 1946-10-11 | 1949-09-27 | 0 | Details |
| US2483126A | Delay timer | Expired / Lapsed | 1946-04-10 | 1949-09-27 | 0 | Details |
| US2483149A | Television film projection with synchronized discharge lamp | Expired / Lapsed | 1946-03-13 | 1949-09-27 | 0 | Details |
| US2483123A | Humbucking arrangement for magnetic transducers | Expired / Lapsed | 1944-11-02 | 1949-09-27 | 0 | Details |
| US2482553A | Electronic relay | Expired / Lapsed | 1946-05-10 | 1949-09-20 | 0 | Details |
| US2481368A | Starting switch for fluorescent lamps | Expired / Lapsed | 1947-10-04 | 1949-09-06 | 0 | Details |
| US2481282A | Coil-polarity indicator | Expired / Lapsed | 1947-08-21 | 1949-09-06 | 0 | Details |
| US2480535A | Enclosure for vibratile elements | Expired / Lapsed | 1947-03-13 | 1949-08-30 | 0 | Details |
| US2479573A | Gas turbine power plant | Expired / Lapsed | 1943-10-20 | 1949-08-23 | 0 | Details |
| US2479400A | Method of forming coil assemblies | Expired / Lapsed | 1948-06-15 | 1949-08-16 | 0 | Details |
| US2479341A | Induction heating apparatus | Expired / Lapsed | 1948-03-16 | 1949-08-16 | 0 | Details |
| US2479313A | Column spring switch | Expired / Lapsed | 1947-07-29 | 1949-08-16 | 0 | Details |
| US2479319A | Control for electric blankets or the like | Expired / Lapsed | 1947-07-12 | 1949-08-16 | 0 | Details |
| US2479374A | Preparation of organo-silicon compounds | Expired / Lapsed | 1947-04-08 | 1949-08-16 | 0 | Details |
| US2479307A | Thermal responsive system | Expired / Lapsed | 1946-04-04 | 1949-08-16 | 0 | Details |
| US2479426A | Impulse testing | Expired / Lapsed | 1945-11-30 | 1949-08-16 | 0 | Details |
| US2479305A | Selective carrier off noise suppression circuit | Expired / Lapsed | 1945-04-25 | 1949-08-16 | 0 | Details |
| US2478649A | Fluid seal | Expired / Lapsed | 1945-12-29 | 1949-08-09 | 0 | Details |
| US2477966A | Electric lamp signaling apparatus | Expired / Lapsed | 1948-02-11 | 1949-08-02 | 0 | Details |
| US2478018A | Apparatus for continuously sheathing cores of material | Expired / Lapsed | 1946-10-29 | 1949-08-02 | 0 | Details |
| US2477131A | Junction box | Expired / Lapsed | 1945-12-22 | 1949-07-26 | 0 | Details |
| US2475640A | Electric quantity standard | Expired / Lapsed | 1946-03-21 | 1949-07-12 | 0 | Details |
| US2476022A | Variable current thermal responsive device | Expired / Lapsed | 1945-06-21 | 1949-07-12 | 0 | Details |
| US2476025A | Precision frequency meter | Expired / Lapsed | 1945-06-09 | 1949-07-12 | 0 | Details |
| US2474580A | Voltage regulating system | Expired / Lapsed | 1946-05-23 | 1949-06-28 | 0 | Details |
| US2474578A | Chlorinated methylchlorosilanes and their hydrolysis produc… | Expired / Lapsed | 1945-05-05 | 1949-06-28 | 0 | Details |
| US2473919A | Method and apparatus for assembling incandescent lamp mounts | Expired / Lapsed | 1947-08-14 | 1949-06-21 | 0 | Details |
| US2473237A | Electric timer | Expired / Lapsed | 1948-02-07 | 1949-06-14 | 0 | Details |
| US2473252A | Push-button switch | Expired / Lapsed | 1947-05-09 | 1949-06-14 | 0 | Details |
| US2471160A | Combination balanced shutoff and throttling valve assembly | Expired / Lapsed | 1948-03-30 | 1949-05-24 | 0 | Details |
| US2471138A | Radio communication system | Expired / Lapsed | 1946-08-16 | 1949-05-24 | 0 | Details |
| US2470479A | Process for making polysiloxane resins | Expired / Lapsed | 1945-11-21 | 1949-05-17 | 0 | Details |
| US2469878A | Switch contact | Expired / Lapsed | 1945-06-23 | 1949-05-10 | 0 | Details |
| US2469888A | Organo-polysiloxanes | Expired / Lapsed | 1942-10-29 | 1949-05-10 | 0 | Details |
| US2469206A | X-ray absorption photometer | Expired / Lapsed | 1946-11-14 | 1949-05-03 | 0 | Details |
| US2468578A | Vibrator power supply | Expired / Lapsed | 1947-12-19 | 1949-04-26 | 0 | Details |
| US2468554A | Apparatus for magnetic field investigation | Expired / Lapsed | 1943-03-19 | 1949-04-26 | 0 | Details |
| US2467812A | Noncontacting thickness gauge | Expired / Lapsed | 1947-04-01 | 1949-04-19 | 0 | Details |
| US2467687A | High-pressure discharge lamp | Expired / Lapsed | 1946-07-08 | 1949-04-19 | 0 | Details |
| US2467844A | Means for measuring the difference in magnitude of alternat… | Expired / Lapsed | 1946-03-26 | 1949-04-19 | 0 | Details |
| US2467856A | Control system | Expired / Lapsed | 1945-10-31 | 1949-04-19 | 0 | Details |
| US2467834A | Oscillograph apparatus | Expired / Lapsed | 1945-07-23 | 1949-04-19 | 0 | Details |
| US2467857A | Adjustable delay line | Expired / Lapsed | 1943-08-12 | 1949-04-19 | 0 | Details |
| US2467831A | Sighting mechanism | Expired / Lapsed | 1942-09-26 | 1949-04-19 | 0 | Details |
| US2467230A | Ultra high frequency dielectric heater | Expired / Lapsed | 1947-08-30 | 1949-04-12 | 0 | Details |
| US2467185A | Adjustment means for optical components of projection telev… | Expired / Lapsed | 1947-01-11 | 1949-04-12 | 0 | Details |
| US2467208A | Pulse echo system | Expired / Lapsed | 1943-12-30 | 1949-04-12 | 0 | Details |
| US2467361A | Phase comparator | Expired / Lapsed | 1943-10-28 | 1949-04-12 | 0 | Details |
| US2465798A | Magnetic core | Expired / Lapsed | 1946-03-28 | 1949-03-29 | 0 | Details |
| US2464807A | Hall effect converter | Expired / Lapsed | 1947-08-16 | 1949-03-22 | 0 | Details |
| US2465059A | Pulse starting circuit for electric discharge devices | Expired / Lapsed | 1947-08-13 | 1949-03-22 | 0 | Details |
| US2465093A | High-frequency corona arc heating apparatus | Expired / Lapsed | 1946-07-03 | 1949-03-22 | 0 | Details |
| US2464568A | Electrical coil insulated with thermoplastic particles and … | Expired / Lapsed | 1945-05-14 | 1949-03-15 | 0 | Details |
| US2464565A | Disconnecting device | Expired / Lapsed | 1945-02-08 | 1949-03-15 | 0 | Details |
| US2464629A | Maneuvering automatic control | Expired / Lapsed | 1945-01-01 | 1949-03-15 | 0 | Details |
| US2464029A | Method of making transformers | Expired / Lapsed | 1945-04-07 | 1949-03-08 | 0 | Details |
| US2463318A | Electronic time delay circuit | Expired / Lapsed | 1944-08-05 | 1949-03-01 | 0 | Details |
| US2462635A | Cyclic polymeric organoaminosilanes | Expired / Lapsed | 1946-10-22 | 1949-02-22 | 0 | Details |
| US2462336A | Electric discharge device and method of operation | Expired / Lapsed | 1946-04-10 | 1949-02-22 | 0 | Details |
| US2462624A | Voltage regulating system | Expired / Lapsed | 1945-05-18 | 1949-02-22 | 0 | Details |
| US2461998A | Pulse echo system and pulse indicating means | Expired / Lapsed | 1943-11-17 | 1949-02-15 | 0 | Details |
| US2461303A | Grid structure for electric discharge devices | Expired / Lapsed | 1948-03-09 | 1949-02-08 | 0 | Details |
| US2461261A | Overload protection device for power transmission apparatus | Expired / Lapsed | 1947-01-27 | 1949-02-08 | 0 | Details |
| US2461286A | Radio-frequency bridge | Expired / Lapsed | 1946-06-10 | 1949-02-08 | 0 | Details |
| US2461283A | High-frequency heating regulator | Expired / Lapsed | 1946-05-07 | 1949-02-08 | 0 | Details |
| US2460153A | Piezoelectric crystal holder | Expired / Lapsed | 1946-07-30 | 1949-01-25 | 0 | Details |
| US2460127A | Electric control circuits | Expired / Lapsed | 1946-07-02 | 1949-01-25 | 0 | Details |
| US2460115A | Rotation rate change generator | Expired / Lapsed | 1946-06-18 | 1949-01-25 | 0 | Details |
| US2460116A | Control device | Expired / Lapsed | 1945-08-24 | 1949-01-25 | 0 | Details |
| US2459852A | Trigger network | Expired / Lapsed | 1945-06-08 | 1949-01-25 | 0 | Details |
| US2460142A | Electronic calibrating means for indicating instruments in … | Expired / Lapsed | 1945-01-30 | 1949-01-25 | 0 | Details |
| US2458933A | Unloader for reciprocating gas compressors | Expired / Lapsed | 1946-12-18 | 1949-01-11 | 0 | Details |
| US2458511A | Combined switch stud and fuse clip | Expired / Lapsed | 1945-06-06 | 1949-01-11 | 0 | Details |
| US2458288A | Piezoelectric crystal holder | Expired / Lapsed | 1946-12-24 | 1949-01-04 | 0 | Details |
| US2457580A | Radio locating equipment | Expired / Lapsed | 1944-12-26 | 1948-12-28 | 0 | Details |
| US2456952A | Sensitivity time control | Expired / Lapsed | 1946-05-03 | 1948-12-21 | 0 | Details |
| US2456916A | Electric blanket control | Expired / Lapsed | 1946-01-09 | 1948-12-21 | 0 | Details |
| US2456859A | Electric discharge apparatus | Expired / Lapsed | 1944-03-29 | 1948-12-21 | 0 | Details |
| US2456430A | Telemetering apparatus | Expired / Lapsed | 1947-10-15 | 1948-12-14 | 0 | Details |
| US2456420A | Electronic direct-current control system | Expired / Lapsed | 1946-08-31 | 1948-12-14 | 0 | Details |
| US2456427A | Protective system for electric motors | Expired / Lapsed | 1944-11-28 | 1948-12-14 | 0 | Details |
| US2456381A | Electric capacitor | Expired / Lapsed | 1944-07-29 | 1948-12-14 | 0 | Details |
| US2456463A | Motor protective device | Expired / Lapsed | 1943-11-23 | 1948-12-14 | 0 | Details |
| US2455850A | Two-temperature refrigerating system | Expired / Lapsed | 1947-05-05 | 1948-12-07 | 0 | Details |
| US2455875A | Inductance unit | Expired / Lapsed | 1944-07-10 | 1948-12-07 | 0 | Details |
| US2454966A | Heated stylus inkless recorder | Expired / Lapsed | 1947-02-14 | 1948-11-30 | 0 | Details |
| US2455265A | Pulse radar system | Expired / Lapsed | 1943-04-09 | 1948-11-30 | 0 | Details |
| US2453498A | Electric switch | Expired / Lapsed | 1947-04-15 | 1948-11-09 | 0 | Details |
| US2453524A | Centrifugal compressor | Expired / Lapsed | 1945-03-31 | 1948-11-09 | 0 | Details |
| US2452611A | Electric regulator | Expired / Lapsed | 1946-03-21 | 1948-11-02 | 0 | Details |
| US2452951A | Crystal oscillator circuits | Expired / Lapsed | 1943-04-27 | 1948-11-02 | 0 | Details |
| US2452349A | Directive radio antenna | Expired / Lapsed | 1942-12-24 | 1948-10-26 | 0 | Details |
| US2451816A | Web break detector | Expired / Lapsed | 1946-08-31 | 1948-10-19 | 0 | Details |
| US2451871A | Dimethyl germanium dichloride | Expired / Lapsed | 1946-08-17 | 1948-10-19 | 0 | Details |
| US2451858A | Controlled frequency oscillator | Expired / Lapsed | 1945-01-26 | 1948-10-19 | 0 | Details |
| US2451830A | Starting arrangement for electric discharge devices | Expired / Lapsed | 1944-11-21 | 1948-10-19 | 0 | Details |
| US2451793A | Radio landing apparatus | Expired / Lapsed | 1943-05-22 | 1948-10-19 | 0 | Details |
| US2451835A | Supercharger control system | Expired / Lapsed | 1942-01-28 | 1948-10-19 | 0 | Details |
| US2451219A | Dynamoelectric machine | Expired / Lapsed | 1947-05-28 | 1948-10-12 | 0 | Details |
| US2451252A | Flexible conduit joint | Expired / Lapsed | 1945-02-01 | 1948-10-12 | 0 | Details |
| US2449572A | Polysiloxane resins | Expired / Lapsed | 1944-08-11 | 1948-09-21 | 0 | Details |
| US2449391A | Bidirectional selective remote control system | Expired / Lapsed | 1948-01-21 | 1948-09-14 | 0 | Details |
| US2449528A | Copolymers of monovinylphenoxthines and method of preparing… | Expired / Lapsed | 1947-05-29 | 1948-09-14 | 0 | Details |
| US2448556A | Synthetic elastic and elastomeric products | Expired / Lapsed | 1947-01-16 | 1948-09-07 | 0 | Details |
| US2448530A | Modified silicone compositions | Expired / Lapsed | 1945-11-30 | 1948-09-07 | 0 | Details |
| US2448756A | Methyl siloxane elastomers | Expired / Lapsed | 1944-03-14 | 1948-09-07 | 0 | Details |
| US2448389A | Fuse unit | Expired / Lapsed | 1945-06-02 | 1948-08-31 | 0 | Details |
| US2447880A | Magnetometer | Expired / Lapsed | 1945-08-24 | 1948-08-24 | 0 | Details |
| US2446810A | Electric blanket and control therefor | Expired / Lapsed | 1947-10-01 | 1948-08-10 | 0 | Details |
| US2446826A | Magnetron | Expired / Lapsed | 1943-04-14 | 1948-08-10 | 0 | Details |
| US2446429A | Cellular phenolic resin | Expired / Lapsed | 1944-10-20 | 1948-08-03 | 0 | Details |
| US2445794A | Methyl silicone elastomers containing si-bonded vinyl radic… | Expired / Lapsed | 1945-06-11 | 1948-07-27 | 0 | Details |
| US2446013A | Combustion chamber drain arrangement | Expired / Lapsed | 1945-05-31 | 1948-07-27 | 0 | Details |
| US2445993A | Cathode structure | Expired / Lapsed | 1944-02-12 | 1948-07-27 | 0 | Details |
| US2446024A | Directive radio system | Expired / Lapsed | 1943-03-13 | 1948-07-27 | 0 | Details |
| US2445587A | Electric terminal and coil | Expired / Lapsed | 1945-05-10 | 1948-07-20 | 0 | Details |
| US2445584A | Pulse receiving system | Expired / Lapsed | 1942-04-13 | 1948-07-20 | 0 | Details |
| US2445678A | Electric discharge device | Expired / Lapsed | 1942-02-12 | 1948-07-20 | 0 | Details |
| US2444794A | Voltage stabilizing system | Expired / Lapsed | 1945-02-13 | 1948-07-06 | 0 | Details |
| US2444767A | Gas-arc welding apparatus | Expired / Lapsed | 1944-05-29 | 1948-07-06 | 0 | Details |
| US2444782A | Pulse generating circuits | Expired / Lapsed | 1942-10-31 | 1948-07-06 | 0 | Details |
| US2444261A | Control system | Expired / Lapsed | 1947-02-21 | 1948-06-29 | 0 | Details |
| US2444245A | Tension measuring device | Expired / Lapsed | 1946-05-01 | 1948-06-29 | 0 | Details |
| US2443722A | Multiple image optical system | Expired / Lapsed | 1945-11-30 | 1948-06-22 | 0 | Details |
| US2443728A | Luminescent materials | Expired / Lapsed | 1943-02-25 | 1948-06-22 | 0 | Details |
| US2443908A | Ultra high frequency oscillator | Expired / Lapsed | 1943-01-28 | 1948-06-22 | 0 | Details |
| US2443907A | High-frequency cavity resonator apparatus | Expired / Lapsed | 1943-01-11 | 1948-06-22 | 0 | Details |
| US2443488A | Pulsed network | Expired / Lapsed | 1945-05-18 | 1948-06-15 | 0 | Details |
| US2443452A | Switching means | Expired / Lapsed | 1943-11-17 | 1948-06-15 | 0 | Details |
| US2443030A | Picture size control circuit for television receivers | Expired / Lapsed | 1946-11-09 | 1948-06-08 | 0 | Details |
| US2443028A | Control system | Expired / Lapsed | 1936-03-21 | 1948-06-08 | 0 | Details |
| US2442586A | Straight-line recording mechanism | Expired / Lapsed | 1946-09-28 | 1948-06-01 | 0 | Details |
| US2442587A | Electrical coil and method of making the same | Expired / Lapsed | 1945-12-28 | 1948-06-01 | 0 | Details |
| US2442612A | Oscillator | Expired / Lapsed | 1945-10-19 | 1948-06-01 | 0 | Details |
| US2442059A | Rubbery butyl gum-dimethyl polysiloxane gum composition | Expired / Lapsed | 1946-05-29 | 1948-05-25 | 0 | Details |
| US2442212A | Method of preparing organosilicon resin | Expired / Lapsed | 1945-10-19 | 1948-05-25 | 0 | Details |
| US2442196A | Modified methyl polysiloxane compositions | Expired / Lapsed | 1944-11-09 | 1948-05-25 | 0 | Details |
| US2441853A | Phosphate glass | Expired / Lapsed | 1946-03-11 | 1948-05-18 | 0 | Details |
| US2441792A | Stacked electrode assembly for electron discharge devices | Expired / Lapsed | 1944-10-04 | 1948-05-18 | 0 | Details |
| US2441789A | Electromagnetic switching system aided by space-discharge d… | Expired / Lapsed | 1944-06-28 | 1948-05-18 | 0 | Details |
| US2441399A | Incandescent and fluorescent lamp holder | Expired / Lapsed | 1946-01-16 | 1948-05-11 | 0 | Details |
| US2441423A | Alkylsilicon sols and gels | Expired / Lapsed | 1945-02-10 | 1948-05-11 | 0 | Details |
| US2441422A | Organosilicon-silica sols, gels, and aerogels | Expired / Lapsed | 1945-02-10 | 1948-05-11 | 0 | Details |
| US2440980A | Turbine oil system with pump priming arrangement | Expired / Lapsed | 1946-04-23 | 1948-05-04 | 0 | Details |
| US2440538A | Portable cathode-ray oscilloscope | Expired / Lapsed | 1946-04-26 | 1948-04-27 | 0 | Details |
| US2440540A | Transformer | Expired / Lapsed | 1945-10-22 | 1948-04-27 | 0 | Details |
| US2440547A | Pulse generator | Expired / Lapsed | 1944-04-12 | 1948-04-27 | 0 | Details |
| US2440069A | High-temperature elastic fluid turbine | Expired / Lapsed | 1944-08-26 | 1948-04-20 | 0 | Details |
| US2439656A | Receiver protective device | Expired / Lapsed | 1942-08-17 | 1948-04-13 | 0 | Details |
| US2439239A | Cabin supercharger regulator system | Expired / Lapsed | 1945-04-12 | 1948-04-06 | 0 | Details |
| US2438735A | High-frequency wave transmitting apparatus | Expired / Lapsed | 1944-10-02 | 1948-03-30 | 0 | Details |
| US2438561A | Electrothermal deposition apparatus | Expired / Lapsed | 1942-04-30 | 1948-03-30 | 0 | Details |
| US2438367A | Transmitter-receiver switching system | Expired / Lapsed | 1942-10-24 | 1948-03-23 | 0 | Details |
| US2437951A | Follow-up control | Expired / Lapsed | 1943-03-01 | 1948-03-16 | 0 | Details |
| US2437142A | Shaded-pole synchronous motor | Expired / Lapsed | 1946-06-11 | 1948-03-02 | 0 | Details |
| US2436663A | Saw-tooth wave generator | Expired / Lapsed | 1944-11-15 | 1948-02-24 | 0 | Details |
| US2436662A | Pulse generator | Expired / Lapsed | 1944-09-02 | 1948-02-24 | 0 | Details |
| US2436224A | Differential electromagnet having snap action | Expired / Lapsed | 1944-08-29 | 1948-02-17 | 0 | Details |
| US2435960A | Radio detecting and range finding system | Expired / Lapsed | 1942-09-02 | 1948-02-17 | 0 | Details |
| US2435819A | Aircraft cabin pressure control arrangement | Expired / Lapsed | 1944-03-20 | 1948-02-10 | 0 | Details |
| US2435601A | Phase modulation system | Expired / Lapsed | 1942-12-31 | 1948-02-10 | 0 | Details |
| US2435442A | Tuning arrangement for concentric transmission line resonat… | Expired / Lapsed | 1943-12-23 | 1948-02-03 | 0 | Details |
| US2435435A | Cathode-ray screen | Expired / Lapsed | 1943-04-06 | 1948-02-03 | 0 | Details |
| US2434497A | Therapeutic apparatus | Expired / Lapsed | 1945-06-18 | 1948-01-13 | 0 | Details |
| US2434493A | Voltage stabilizing transformer | Expired / Lapsed | 1945-02-17 | 1948-01-13 | 0 | Details |
| US2434610A | Microwave power measuring instrument | Expired / Lapsed | 1944-06-19 | 1948-01-13 | 0 | Details |
| US2433667A | Time measuring apparatus | Expired / Lapsed | 1943-12-29 | 1947-12-30 | 0 | Details |
| US2432272A | Control mechanism for washing machines | Expired / Lapsed | 1945-07-13 | 1947-12-09 | 0 | Details |
| US2432330A | Locating equipment | Expired / Lapsed | 1944-02-18 | 1947-12-09 | 0 | Details |
| US2432399A | Electrical control device | Expired / Lapsed | 1935-04-24 | 1947-12-09 | 0 | Details |
| US2431952A | Pulse generating circuit | Expired / Lapsed | 1944-06-07 | 1947-12-02 | 0 | Details |
| US2431575A | Screen brightness measurement photometer | Expired / Lapsed | 1946-03-18 | 1947-11-25 | 0 | Details |
| US2429819A | High-frequency heating apparatus | Expired / Lapsed | 1944-03-28 | 1947-10-28 | 0 | Details |
| US2429448A | Circuit connector | Expired / Lapsed | 1946-08-15 | 1947-10-21 | 0 | Details |
| US2429453A | Bridge control for electric blankets | Expired / Lapsed | 1946-03-21 | 1947-10-21 | 0 | Details |
| US2429415A | Circuit for electric discharge devices | Expired / Lapsed | 1945-06-07 | 1947-10-21 | 0 | Details |
| US2429475A | Control device for heater circuits | Expired / Lapsed | 1945-04-12 | 1947-10-21 | 0 | Details |
| US2428888A | High-frequency electric discharge device | Expired / Lapsed | 1946-04-15 | 1947-10-14 | 0 | Details |
| US2429066A | Optical transparent film thickness gauge | Expired / Lapsed | 1945-08-01 | 1947-10-14 | 0 | Details |
| US2429067A | Dynamoelectric machine and driving connection | Expired / Lapsed | 1944-12-23 | 1947-10-14 | 0 | Details |
| US2428788A | Interpolymerization products | Expired / Lapsed | 1939-10-31 | 1947-10-14 | 0 | Details |
| US2428634A | Liquid cooled dynamoelectric machine for absorbing energy | Expired / Lapsed | 1945-06-13 | 1947-10-07 | 0 | Details |
| US2428613A | Transformer | Expired / Lapsed | 1943-10-18 | 1947-10-07 | 0 | Details |
| US2428610A | Method and apparatus for manufacturing electric discharge d… | Expired / Lapsed | 1943-09-10 | 1947-10-07 | 0 | Details |
| US2428622A | Tuning and coupling means for highfrequency systems | Expired / Lapsed | 1942-11-12 | 1947-10-07 | 0 | Details |
| US2427752A | Concentric line lamp for measuring high-frequency power | Expired / Lapsed | 1943-09-02 | 1947-09-23 | 0 | Details |
| US2427688A | Electrical translation apparatus | Expired / Lapsed | 1943-06-12 | 1947-09-23 | 0 | Details |
| US2427213A | Linear motion transmitter or receiver | Expired / Lapsed | 1945-10-12 | 1947-09-09 | 0 | Details |
| US2427180A | Telemetering system | Expired / Lapsed | 1945-09-21 | 1947-09-09 | 0 | Details |
| US2427244A | Gas turbine | Expired / Lapsed | 1944-03-07 | 1947-09-09 | 0 | Details |
| US2427231A | Compensation of frequency variation of oscillator caused by… | Expired / Lapsed | 1943-11-10 | 1947-09-09 | 0 | Details |
| US2426467A | Gold-copper solder | Expired / Lapsed | 1945-07-18 | 1947-08-26 | 0 | Details |
| US2425999A | Signal portraying apparatus | Expired / Lapsed | 1943-12-20 | 1947-08-19 | 0 | Details |
| US2425378A | Suds-lock decreasing means for spinner type clothes washing… | Expired / Lapsed | 1943-04-21 | 1947-08-12 | 0 | Details |
| US2425600A | Pulse relay testing system | Expired / Lapsed | 1942-12-14 | 1947-08-12 | 0 | Details |
| US2425605A | Selsyn controlled electric motor system | Expired / Lapsed | 1935-10-01 | 1947-08-12 | 0 | Details |
| US2424830A | Frequency modulation | Expired / Lapsed | 1944-05-30 | 1947-07-29 | 0 | Details |
| US2424853A | Titanium dioxide dielectric materials | Expired / Lapsed | 1944-05-06 | 1947-07-29 | 0 | Details |
| US2424527A | Electric switch | Expired / Lapsed | 1946-08-10 | 1947-07-22 | 0 | Details |
| US2424436A | Pipe coupling | Expired / Lapsed | 1945-04-13 | 1947-07-22 | 0 | Details |
| US2424089A | Ultra high frequency amplifier | Expired / Lapsed | 1944-11-18 | 1947-07-15 | 0 | Details |
| US2424111A | Ceramic products | Expired / Lapsed | 1943-07-27 | 1947-07-15 | 0 | Details |
| US2423830A | Cathode-ray screen having contrasting colors and unlike rat… | Expired / Lapsed | 1943-03-25 | 1947-07-15 | 0 | Details |
| US2423461A | Attenuator for ultra high frequencies | Expired / Lapsed | 1945-05-18 | 1947-07-08 | 0 | Details |
| US2423716A | Ultra high frequency magnetron of the resonator type | Expired / Lapsed | 1943-03-20 | 1947-07-08 | 0 | Details |
| US2423304A | Pulse producing system | Expired / Lapsed | 1944-02-15 | 1947-07-01 | 0 | Details |
| US2422943A | Electron microscope | Expired / Lapsed | 1944-02-01 | 1947-06-24 | 0 | Details |
| US2422457A | Coating apparatus | Expired / Lapsed | 1944-08-10 | 1947-06-17 | 0 | Details |
| US2422189A | Dielectric wave guide system | Expired / Lapsed | 1944-01-22 | 1947-06-17 | 0 | Details |
| US2422040A | Magnetic drive | Expired / Lapsed | 1945-01-27 | 1947-06-10 | 0 | Details |
| US2422058A | Wave guide system | Expired / Lapsed | 1943-08-16 | 1947-06-10 | 0 | Details |
| US2422037A | Electric induction apparatus | Expired / Lapsed | 1942-05-16 | 1947-06-10 | 0 | Details |
| US2421626A | Torque measurement | Expired / Lapsed | 1945-07-02 | 1947-06-03 | 0 | Details |
| US2420912A | Preparation of alkenyl-substituted chlorosilanes | Expired / Lapsed | 1945-06-11 | 1947-05-20 | 0 | Details |
| US2420516A | Pulse producing system | Expired / Lapsed | 1944-06-15 | 1947-05-13 | 0 | Details |
| US2420553A | Torque limiting driving mechanism | Expired / Lapsed | 1942-12-05 | 1947-05-13 | 0 | Details |
| US2420552A | Driving mechanism | Expired / Lapsed | 1942-12-05 | 1947-05-13 | 0 | Details |
| US2419904A | Carrier current protective relaying system | Expired / Lapsed | 1945-08-21 | 1947-04-29 | 0 | Details |
| US2419564A | Radio transmitter-receiver switching system | Expired / Lapsed | 1943-06-10 | 1947-04-29 | 0 | Details |
| US2419527A | Radio frequency transmitter monitoring system and method | Expired / Lapsed | 1943-02-27 | 1947-04-29 | 0 | Details |
| US2419466A | Electronic converter | Expired / Lapsed | 1944-06-12 | 1947-04-22 | 0 | Details |
| US2419459A | Photoelectric detecting apparatus | Expired / Lapsed | 1944-02-01 | 1947-04-22 | 0 | Details |
| US2419469A | Manufacturing method for electrical contacts | Expired / Lapsed | 1943-04-24 | 1947-04-22 | 0 | Details |
| US2419202A | Interpolymerizing butadiene, styrene, and ethyl acrylate | Expired / Lapsed | 1942-09-17 | 1947-04-22 | 0 | Details |
| US2419072A | Electric switch | Expired / Lapsed | 1945-06-08 | 1947-04-15 | 0 | Details |
| US2419099A | Traffic recorder | Expired / Lapsed | 1944-05-27 | 1947-04-15 | 0 | Details |
| US2418810A | Contact element | Expired / Lapsed | 1943-10-08 | 1947-04-15 | 0 | Details |
| US2418707A | Lubricant seal | Expired / Lapsed | 1944-05-27 | 1947-04-08 | 0 | Details |
| US2418364A | Locating equipment | Expired / Lapsed | 1944-05-29 | 1947-04-01 | 0 | Details |
| US2417834A | Self-pulsing oscillator | Expired / Lapsed | 1943-02-19 | 1947-03-25 | 0 | Details |
| US2417692A | Fuse and switch unit | Expired / Lapsed | 1944-07-12 | 1947-03-18 | 0 | Details |
| US2417689A | Gyroscopic device | Expired / Lapsed | 1943-07-12 | 1947-03-18 | 0 | Details |
| US2417248A | Pulse direction finder | Expired / Lapsed | 1943-07-30 | 1947-03-11 | 0 | Details |
| US2417229A | Electric computer | Expired / Lapsed | 1942-04-17 | 1947-03-11 | 0 | Details |
| US2416895A | Pulse signalling system | Expired / Lapsed | 1942-10-02 | 1947-03-04 | 0 | Details |
| US2416591A | Radar locating equipment | Expired / Lapsed | 1944-04-15 | 1947-02-25 | 0 | Details |
| US2416562A | Follow-up system | Expired / Lapsed | 1942-11-09 | 1947-02-25 | 0 | Details |
| US2416111A | Pulse generating circuit | Expired / Lapsed | 1944-06-19 | 1947-02-18 | 0 | Details |
| US2416097A | Automatic pilot | Expired / Lapsed | 1943-05-28 | 1947-02-18 | 0 | Details |
| US2416158A | Frequency dividing apparatus | Expired / Lapsed | 1942-10-09 | 1947-02-18 | 0 | Details |
| US2416089A | Selective pulse amplifier system | Expired / Lapsed | 1942-06-26 | 1947-02-18 | 0 | Details |
| US2416088A | Pulse system | Expired / Lapsed | 1942-06-01 | 1947-02-18 | 0 | Details |
| US2415679A | Antenna | Expired / Lapsed | 1943-03-27 | 1947-02-11 | 0 | Details |
| US2414936A | Follow-up control system | Expired / Lapsed | 1944-05-25 | 1947-01-28 | 0 | Details |
| US2414939A | Beam deflection control circuit | Expired / Lapsed | 1943-11-01 | 1947-01-28 | 0 | Details |
| US2414803A | Vulcanizable compositions | Expired / Lapsed | 1942-09-17 | 1947-01-28 | 0 | Details |
| US2414128A | Compass transmitter | Expired / Lapsed | 1945-07-30 | 1947-01-14 | 0 | Details |
| US2414317A | Rectifier type controller | Expired / Lapsed | 1944-06-01 | 1947-01-14 | 0 | Details |
| US2414318A | Phase sensitive modulator | Expired / Lapsed | 1944-06-01 | 1947-01-14 | 0 | Details |
| US2414323A | Cathode-ray apparatus | Expired / Lapsed | 1942-09-28 | 1947-01-14 | 0 | Details |
| US2413949A | Treating silicon steel strip | Expired / Lapsed | 1942-12-23 | 1947-01-07 | 0 | Details |
| US2413442A | Electrode activation | Expired / Lapsed | 1944-01-28 | 1946-12-31 | 0 | Details |
| US2413182A | Radio communication system | Expired / Lapsed | 1943-02-10 | 1946-12-24 | 0 | Details |
| US2413201A | Radio-frequency transformer | Expired / Lapsed | 1943-01-27 | 1946-12-24 | 0 | Details |
| US2412851A | Dynamoelectric machine and method of making the same | Expired / Lapsed | 1945-04-03 | 1946-12-17 | 0 | Details |
| US2412824A | Magnetron | Expired / Lapsed | 1942-06-22 | 1946-12-17 | 0 | Details |
| US2412612A | Directive radio system | Expired / Lapsed | 1941-10-08 | 1946-12-17 | 0 | Details |
| US2412631A | High-frequency apparatus | Expired / Lapsed | 1936-04-09 | 1946-12-17 | 0 | Details |
| US2412470A | Production of water-repellent materials | Expired / Lapsed | 1943-02-22 | 1946-12-10 | 0 | Details |
| US2412446A | Ultra high frequency system | Expired / Lapsed | 1942-10-31 | 1946-12-10 | 0 | Details |
| US2412071A | Cabin supercharging means having automatic pressure and tem… | Expired / Lapsed | 1944-07-22 | 1946-12-03 | 0 | Details |
| US2412064A | Saw-tooth wave generator | Expired / Lapsed | 1942-10-22 | 1946-12-03 | 0 | Details |
| US2412063A | Saw-tooth wave generator | Expired / Lapsed | 1942-10-22 | 1946-12-03 | 0 | Details |
| US2412161A | Transmission system | Expired / Lapsed | 1941-12-01 | 1946-12-03 | 0 | Details |
| US2412159A | Directional radio system | Expired / Lapsed | 1941-09-15 | 1946-12-03 | 0 | Details |
| US2411742A | Electric valve system | Expired / Lapsed | 1942-09-01 | 1946-11-26 | 0 | Details |
| US2411706A | Phase inverter circuit | Expired / Lapsed | 1942-06-03 | 1946-11-26 | 0 | Details |
| US2411741A | Color matching apparatus | Expired / Lapsed | 1939-12-13 | 1946-11-26 | 0 | Details |
| US2411423A | Phase shifting circuit | Expired / Lapsed | 1944-05-09 | 1946-11-19 | 0 | Details |
| US2411472A | Antenna system | Expired / Lapsed | 1944-05-05 | 1946-11-19 | 0 | Details |
| US2411424A | Ultra high frequency space resonant system | Expired / Lapsed | 1943-01-28 | 1946-11-19 | 0 | Details |
| US2411065A | Speed governing mechanism | Expired / Lapsed | 1944-08-07 | 1946-11-12 | 0 | Details |
| US2410737A | Method of curing hydrocarbon-substituted polysiloxane resin… | Expired / Lapsed | 1944-08-11 | 1946-11-05 | 0 | Details |
| US2410733A | Method of making mechanically resistant and highly reflecti… | Expired / Lapsed | 1943-03-06 | 1946-11-05 | 0 | Details |
| US2409837A | Centrifugal type compressor | Expired / Lapsed | 1944-04-21 | 1946-10-22 | 0 | Details |
| US2409836A | Centrifugal type compressor | Expired / Lapsed | 1944-04-21 | 1946-10-22 | 0 | Details |
| US2409913A | Wave guide structure | Expired / Lapsed | 1944-02-14 | 1946-10-22 | 0 | Details |
| US2409640A | Power cable for high-frequency oscillators | Expired / Lapsed | 1942-09-18 | 1946-10-22 | 0 | Details |
| US2409004A | Multicircuit connector | Expired / Lapsed | 1942-11-19 | 1946-10-08 | 0 | Details |
| US2408927A | Filtering arrangement | Expired / Lapsed | 1942-07-30 | 1946-10-08 | 0 | Details |
| US2408822A | Electrical discharge device | Expired / Lapsed | 1942-07-30 | 1946-10-08 | 0 | Details |
| US2409030A | Light-impulse system | Expired / Lapsed | 1941-12-22 | 1946-10-08 | 0 | Details |
| US2408055A | Ultra high frequency coupling device and system | Expired / Lapsed | 1944-07-17 | 1946-09-24 | 0 | Details |
| US2407911A | Wave propagation | Expired / Lapsed | 1942-04-16 | 1946-09-17 | 0 | Details |
| US2407505A | Electric discharge device circuit | Expired / Lapsed | 1942-04-04 | 1946-09-10 | 0 | Details |
| US2407479A | Interpolymerization products | Expired / Lapsed | 1939-10-31 | 1946-09-10 | 0 | Details |
| US2407100A | Drafting of fibers | Expired / Lapsed | 1943-06-26 | 1946-09-03 | 0 | Details |
| US2407069A | Dielectric wave guide system | Expired / Lapsed | 1942-09-15 | 1946-09-03 | 0 | Details |
| US2406597A | Electric pickup | Expired / Lapsed | 1944-09-07 | 1946-08-27 | 0 | Details |
| US2406621A | Method of preparing polysiloxane resins | Expired / Lapsed | 1944-02-12 | 1946-08-27 | 0 | Details |
| US2406635A | Method for amplifying highfrequency signals | Expired / Lapsed | 1942-03-27 | 1946-08-27 | 0 | Details |
| US2406277A | High-frequency electric discharge device | Expired / Lapsed | 1942-11-13 | 1946-08-20 | 0 | Details |
| US2406276A | Electric discharge device | Expired / Lapsed | 1942-11-13 | 1946-08-20 | 0 | Details |
| US2405413A | Aircraft supercharger arrangement | Expired / Lapsed | 1944-03-06 | 1946-08-06 | 0 | Details |
| US2405429A | Position indicator | Expired / Lapsed | 1943-12-10 | 1946-08-06 | 0 | Details |
| US2405397A | Electric circuits | Expired / Lapsed | 1943-02-12 | 1946-08-06 | 0 | Details |
| US2405048A | Centrifugal compressor | Expired / Lapsed | 1944-11-18 | 1946-07-30 | 0 | Details |
| US2405041A | Preparation of methyl polysiloxane resins | Expired / Lapsed | 1944-05-19 | 1946-07-30 | 0 | Details |
| US2405073A | Phase comparator | Expired / Lapsed | 1943-10-28 | 1946-07-30 | 0 | Details |
| US2405071A | Pulse generating system | Expired / Lapsed | 1943-10-01 | 1946-07-30 | 0 | Details |
| US2405070A | Square wave pulse generating system | Expired / Lapsed | 1942-02-23 | 1946-07-30 | 0 | Details |
| US2405069A | Pulse generating system | Expired / Lapsed | 1942-02-23 | 1946-07-30 | 0 | Details |
| US2404643A | Electronic electroresponsive apparatus | Expired / Lapsed | 1943-03-20 | 1946-07-23 | 0 | Details |
| US2404626A | Noise limiting circuit | Expired / Lapsed | 1942-10-05 | 1946-07-23 | 0 | Details |
| US2404254A | Electrical apparatus | Expired / Lapsed | 1943-02-02 | 1946-07-16 | 0 | Details |
| US2404227A | Electromagnetic control apparatus | Expired / Lapsed | 1943-01-08 | 1946-07-16 | 0 | Details |
| US2404212A | Magnetron | Expired / Lapsed | 1942-12-24 | 1946-07-16 | 0 | Details |
| US2403803A | Electric blanket | Expired / Lapsed | 1944-09-21 | 1946-07-09 | 0 | Details |
| US2403414A | Protective system | Expired / Lapsed | 1944-01-27 | 1946-07-02 | 0 | Details |
| US2403340A | Insulated conducting member and method of applying the insu… | Expired / Lapsed | 1942-06-16 | 1946-07-02 | 0 | Details |
| US2402928A | Synchronous motion transmission system | Expired / Lapsed | 1944-03-10 | 1946-06-25 | 0 | Details |
| US2402119A | Electron tube structure and the manufacture thereof | Expired / Lapsed | 1944-08-10 | 1946-06-18 | 0 | Details |
| US2401996A | Cable terminal | Expired / Lapsed | 1942-07-28 | 1946-06-11 | 0 | Details |
| US2401421A | Control system | Expired / Lapsed | 1944-10-30 | 1946-06-04 | 0 | Details |
| US2400916A | Safety lamp | Expired / Lapsed | 1944-09-11 | 1946-05-28 | 0 | Details |
| US2401160A | Pull-off magnet | Expired / Lapsed | 1944-01-07 | 1946-05-28 | 0 | Details |
| US2401130A | Terminal connector | Expired / Lapsed | 1943-12-27 | 1946-05-28 | 0 | Details |
| US2400334A | Refrigerating system | Expired / Lapsed | 1944-06-29 | 1946-05-14 | 0 | Details |
| US2400335A | Refrigerating system | Expired / Lapsed | 1944-06-29 | 1946-05-14 | 0 | Details |
| US2399925A | Unidirectional gear drive | Expired / Lapsed | 1943-12-20 | 1946-05-07 | 0 | Details |
| US2399955A | Oscilloscope wave expansion | Expired / Lapsed | 1942-06-30 | 1946-05-07 | 0 | Details |
| US2399469A | Secret signaling system | Expired / Lapsed | 1940-07-31 | 1946-04-30 | 0 | Details |
| US2399017A | Locating equipment | Expired / Lapsed | 1943-07-26 | 1946-04-23 | 0 | Details |
| US2398997A | Variable-speed gear transmission | Expired / Lapsed | 1943-02-22 | 1946-04-23 | 0 | Details |
| US2399023A | Ignition distributor | Expired / Lapsed | 1942-11-23 | 1946-04-23 | 0 | Details |
| US2398673A | Electric heating system | Expired / Lapsed | 1944-07-13 | 1946-04-16 | 0 | Details |
| US2397540A | Ratio circuit | Expired / Lapsed | 1943-09-21 | 1946-04-02 | 0 | Details |
| US2394786A | Carrier current control system | Expired / Lapsed | 1942-10-24 | 1946-02-12 | 0 | Details |
| US2394546A | Aluminum base alloy containing copper and beryllium and met… | Expired / Lapsed | 1942-03-28 | 1946-02-12 | 0 | Details |
| US2394474A | Coiled filament or cathode and its manufacture | Expired / Lapsed | 1944-12-28 | 1946-02-05 | 0 | Details |
| US2394436A | Starting control for electric discharge device | Expired / Lapsed | 1943-12-17 | 1946-02-05 | 0 | Details |
| US2394072A | Electron accelerator control system | Expired / Lapsed | 1943-09-10 | 1946-02-05 | 0 | Details |
| US2394393A | Frequency modulation transmitter | Expired / Lapsed | 1943-05-26 | 1946-02-05 | 0 | Details |
| US2394389A | Pulse generating circuit | Expired / Lapsed | 1943-02-12 | 1946-02-05 | 0 | Details |
| US2394061A | Condition control system | Expired / Lapsed | 1943-01-22 | 1946-02-05 | 0 | Details |
| US2394060A | Cabinet for electrical apparatus | Expired / Lapsed | 1942-11-13 | 1946-02-05 | 0 | Details |
| US2394084A | Electric control and protective systems | Expired / Lapsed | 1942-07-21 | 1946-02-05 | 0 | Details |
| US2394070A | Magnetic induction accelerator | Expired / Lapsed | 1942-06-02 | 1946-02-05 | 0 | Details |
| US2393585A | Power boost | Expired / Lapsed | 1944-12-14 | 1946-01-29 | 0 | Details |
| US2393622A | Electric control system | Expired / Lapsed | 1944-05-01 | 1946-01-29 | 0 | Details |
| US2393816A | Electrical contact element | Expired / Lapsed | 1943-01-01 | 1946-01-29 | 0 | Details |
| US2392858A | High-speed rotor for centrifugal compressors and the like | Expired / Lapsed | 1943-03-08 | 1946-01-15 | 0 | Details |
| US2393186A | Instrument-reading register and printer | Expired / Lapsed | 1942-11-12 | 1946-01-15 | 0 | Details |
| US2392713A | Process of preparing dimethyl silicone elastomers | Expired / Lapsed | 1944-07-01 | 1946-01-08 | 0 | Details |
| US2392632A | Frequency difference measurement | Expired / Lapsed | 1944-06-17 | 1946-01-08 | 0 | Details |
| US2392664A | Ultra high frequency filter | Expired / Lapsed | 1943-12-23 | 1946-01-08 | 0 | Details |
| US2392114A | Pulse system | Expired / Lapsed | 1943-01-23 | 1946-01-01 | 0 | Details |
| US2391742A | Synthetic rubber compositions | Expired / Lapsed | 1943-04-01 | 1945-12-25 | 0 | Details |
| US2391718A | Washing machine | Expired / Lapsed | 1942-12-12 | 1945-12-25 | 0 | Details |
| US2390191A | Phosphate glass | Expired / Lapsed | 1945-03-12 | 1945-12-04 | 0 | Details |
| US2390344A | Electric switch | Expired / Lapsed | 1944-03-01 | 1945-12-04 | 0 | Details |
| US2390378A | Method of making silicone resins | Expired / Lapsed | 1942-08-21 | 1945-12-04 | 0 | Details |
| US2389931A | Method for producing organosiliconhalides | Expired / Lapsed | 1943-09-27 | 1945-11-27 | 0 | Details |
| US2388951A | Snap-acting device | Expired / Lapsed | 1944-11-24 | 1945-11-13 | 0 | Details |
| US2388866A | Lead glass composition | Expired / Lapsed | 1944-01-29 | 1945-11-13 | 0 | Details |
| US2388977A | System for the transmission of angular motion | Expired / Lapsed | 1938-01-03 | 1945-11-13 | 0 | Details |
| US2388295A | Mutual coupling | Expired / Lapsed | 1943-07-02 | 1945-11-06 | 0 | Details |
| US2388555A | Automatic pattern controlled machine tool | Expired / Lapsed | 1943-05-07 | 1945-11-06 | 0 | Details |
| US2387562A | Condition control system | Expired / Lapsed | 1942-12-07 | 1945-10-23 | 0 | Details |
| US2386259A | Waterproofing treatment of materials | Expired / Lapsed | 1942-07-30 | 1945-10-09 | 0 | Details |
| US2386728A | Wave expansion arrangement for cathode-ray oscilloscopes | Expired / Lapsed | 1941-08-01 | 1945-10-09 | 0 | Details |
| US2386060A | Fuse unit | Expired / Lapsed | 1942-10-29 | 1945-10-02 | 0 | Details |
| US2385664A | Cabin supercharger arrangements | Expired / Lapsed | 1941-08-19 | 1945-09-25 | 0 | Details |
| US2385214A | Electric control circuit | Expired / Lapsed | 1943-09-17 | 1945-09-18 | 0 | Details |
| US2384362A | Automatic reclosing circuit breaker system | Expired / Lapsed | 1942-06-23 | 1945-09-04 | 0 | Details |
| US2384375A | Protection of electric systems | Expired / Lapsed | 1940-06-06 | 1945-09-04 | 0 | Details |
| US2383823A | Electric resistor | Expired / Lapsed | 1943-06-15 | 1945-08-28 | 0 | Details |
| US2383827A | Process of preparing silicone resins | Expired / Lapsed | 1943-02-01 | 1945-08-28 | 0 | Details |
| US2383291A | Heat control device | Expired / Lapsed | 1942-08-28 | 1945-08-21 | 0 | Details |
| US2382908A | Electric protective system | Expired / Lapsed | 1944-05-11 | 1945-08-14 | 0 | Details |
| US2382857A | Electric induction apparatus | Expired / Lapsed | 1943-04-15 | 1945-08-14 | 0 | Details |
| US2382387A | Gas turbine | Expired / Lapsed | 1942-12-03 | 1945-08-14 | 0 | Details |
| US2381366A | Organo-dihalogenosiloxanes | Expired / Lapsed | 1942-10-29 | 1945-08-07 | 0 | Details |
| US2380995A | Preparation of organosilicon halides | Expired / Lapsed | 1941-09-26 | 1945-08-07 | 0 | Details |
| US2380996A | Preparation of organosilicon halides | Expired / Lapsed | 1941-09-26 | 1945-08-07 | 0 | Details |
| US2381527A | Protective apparatus | Expired / Lapsed | 1941-07-31 | 1945-08-07 | 0 | Details |
| US2380782A | Housing for electric apparatus | Expired / Lapsed | 1944-03-17 | 1945-07-31 | 0 | Details |
| US2380389A | Balancing system | Expired / Lapsed | 1942-05-07 | 1945-07-31 | 0 | Details |
| US2380732A | Washing machine | Expired / Lapsed | 1941-04-30 | 1945-07-31 | 0 | Details |
| US2380251A | Electromagnetic gauge | Expired / Lapsed | 1944-07-11 | 1945-07-10 | 0 | Details |
| US2380333A | High frequency antenna | Expired / Lapsed | 1942-12-31 | 1945-07-10 | 0 | Details |
| US2379716A | Magnetic field gradient meter | Expired / Lapsed | 1943-09-16 | 1945-07-03 | 0 | Details |
| US2379455A | Engine supercharger system | Expired / Lapsed | 1942-07-20 | 1945-07-03 | 0 | Details |
| US2379286A | Refrigerating system | Expired / Lapsed | 1943-05-24 | 1945-06-26 | 0 | Details |
| US2379318A | High-frequency transmission line | Expired / Lapsed | 1942-07-22 | 1945-06-26 | 0 | Details |
| US2378268A | Protective apparatus | Expired / Lapsed | 1943-11-24 | 1945-06-12 | 0 | Details |
| US2377757A | Short time interval meter | Expired / Lapsed | 1943-12-01 | 1945-06-05 | 0 | Details |
| US2377187A | Electrical connector | Expired / Lapsed | 1944-05-10 | 1945-05-29 | 0 | Details |
| US2377175A | Display apparatus | Expired / Lapsed | 1939-01-24 | 1945-05-29 | 0 | Details |
| US2376653A | Laminated structure | Expired / Lapsed | 1942-03-31 | 1945-05-22 | 0 | Details |
| US2376725A | End seal for transmission lines | Expired / Lapsed | 1942-02-28 | 1945-05-22 | 0 | Details |
| US2376156A | Pressure gauge | Expired / Lapsed | 1944-02-07 | 1945-05-15 | 0 | Details |
| US2376219A | Fabrication of quartz resonators | Expired / Lapsed | 1944-01-28 | 1945-05-15 | 0 | Details |
| US2376142A | Control system for aircraft turbosuperchargers | Expired / Lapsed | 1943-04-01 | 1945-05-15 | 0 | Details |
| US2375702A | Surface type heat exchanger | Expired / Lapsed | 1943-07-29 | 1945-05-08 | 0 | Details |
| US2375722A | Carrier-current control system | Expired / Lapsed | 1942-09-15 | 1945-05-08 | 0 | Details |
| US2375709A | Expansion circuit for oscilloscopes | Expired / Lapsed | 1940-08-03 | 1945-05-08 | 0 | Details |
| US2374708A | Control system for aircraft turbosuperchargers | Expired / Lapsed | 1942-07-25 | 1945-05-01 | 0 | Details |
| US2374588A | Hydraulic torque transmission arrangement | Expired / Lapsed | 1942-08-22 | 1945-04-24 | 0 | Details |
| US2374315A | Starting control for electric discharge devices | Expired / Lapsed | 1942-05-07 | 1945-04-24 | 0 | Details |
| US2374310A | Method of producing solids of desired configuration | Expired / Lapsed | 1941-06-27 | 1945-04-24 | 0 | Details |
| US2373549A | Method of removing cations from liquid media | Expired / Lapsed | 1942-10-15 | 1945-04-10 | 0 | Details |
| US2373547A | Method of removing cations from liquid media | Expired / Lapsed | 1942-10-15 | 1945-04-10 | 0 | Details |
| US2372983A | Spinning bucket | Expired / Lapsed | 1944-03-29 | 1945-04-03 | 0 | Details |
| US2372934A | Noise suppression circuits | Expired / Lapsed | 1942-05-23 | 1945-04-03 | 0 | Details |
| US2372467A | Turbosupercharger | Expired / Lapsed | 1944-02-04 | 1945-03-27 | 0 | Details |
| US2371963A | Scanning apparatus for moving strip | Expired / Lapsed | 1944-01-07 | 1945-03-20 | 0 | Details |
| US2372017A | Electric control circuits | Expired / Lapsed | 1943-04-14 | 1945-03-20 | 0 | Details |
| US2371511A | Magnetic transmission | Expired / Lapsed | 1943-02-23 | 1945-03-13 | 0 | Details |
| US2371068A | Treatment of organo-silicols and products thereof | Expired / Lapsed | 1940-04-30 | 1945-03-06 | 0 | Details |
| US2370216A | Noise suppression circuits | Expired / Lapsed | 1942-07-22 | 1945-02-27 | 0 | Details |
| US2370178A | Electric valve circuit | Expired / Lapsed | 1942-06-29 | 1945-02-27 | 0 | Details |
| US2370287A | Electric valve circuit | Expired / Lapsed | 1942-06-29 | 1945-02-27 | 0 | Details |
| US2370526A | Hydraulic torque transmission arrangement | Expired / Lapsed | 1942-02-20 | 1945-02-27 | 0 | Details |
| US2369966A | Smoke detector | Expired / Lapsed | 1943-06-17 | 1945-02-20 | 0 | Details |
| US2369948A | Reaction products of an aldehyde and a triazole derivative | Expired / Lapsed | 1942-11-25 | 1945-02-20 | 0 | Details |
| US2369585A | Frequency modulation receiver | Expired / Lapsed | 1943-07-23 | 1945-02-13 | 0 | Details |
| US2369066A | Amplifier | Expired / Lapsed | 1943-12-29 | 1945-02-06 | 0 | Details |
| US2368454A | Thermionic amplifier | Expired / Lapsed | 1943-01-23 | 1945-01-30 | 0 | Details |
| US2368485A | Motor controller | Expired / Lapsed | 1942-12-01 | 1945-01-30 | 0 | Details |
| US2368453A | Remote gain control for video amplifiers | Expired / Lapsed | 1942-07-28 | 1945-01-30 | 0 | Details |
| US2368505A | Spacer for electrical windings | Expired / Lapsed | 1942-05-05 | 1945-01-30 | 0 | Details |
| US2368609A | Electroacoustic transducer | Expired / Lapsed | 1941-06-07 | 1945-01-30 | 0 | Details |
| US2368451A | Polyaminotriazine-formaldehyde resin modified with a prefor… | Expired / Lapsed | 1940-11-15 | 1945-01-30 | 0 | Details |
| US2368449A | Expander circuit for oscilloscopes | Expired / Lapsed | 1940-08-03 | 1945-01-30 | 0 | Details |
| US2368448A | Expander circuit for oscilloscopes | Expired / Lapsed | 1940-06-01 | 1945-01-30 | 0 | Details |
| US2367331A | Cathode construction | Expired / Lapsed | 1941-12-08 | 1945-01-16 | 0 | Details |
| US2366565A | Audio-frequency amplifier | Expired / Lapsed | 1943-05-13 | 1945-01-02 | 0 | Details |
| US2366495A | Synthetic products having molecularly oriented structure | Expired / Lapsed | 1942-07-03 | 1945-01-02 | 0 | Details |
| US2366577A | Electric regulating and control system | Expired / Lapsed | 1942-05-26 | 1945-01-02 | 0 | Details |
| US2366537A | Electric control circuit | Expired / Lapsed | 1942-04-23 | 1945-01-02 | 0 | Details |
| US2366060A | Electric valve time-delay relay | Expired / Lapsed | 1942-11-24 | 1944-12-26 | 0 | Details |
| US2366007A | Production of synthetic polymeric compositions comprising s… | Expired / Lapsed | 1942-08-11 | 1944-12-26 | 0 | Details |
| US2365512A | Multivibrator | Expired / Lapsed | 1943-03-24 | 1944-12-19 | 0 | Details |
| US2365575A | Electron discharge amplifier | Expired / Lapsed | 1941-12-31 | 1944-12-19 | 0 | Details |
| US2365019A | Insulated electrical conductor | Expired / Lapsed | 1942-06-09 | 1944-12-12 | 0 | Details |
| US2364998A | Electric control circuit | Expired / Lapsed | 1941-08-13 | 1944-12-12 | 0 | Details |
| US2364486A | Control system | Expired / Lapsed | 1943-12-14 | 1944-12-05 | 0 | Details |
| US2364436A | Insulation for magnetic steel and the like | Expired / Lapsed | 1943-07-07 | 1944-12-05 | 0 | Details |
| US2363835A | Frequency conversion | Expired / Lapsed | 1943-04-01 | 1944-11-28 | 0 | Details |
| US2363531A | Electric discharge device and electrode therefor | Expired / Lapsed | 1941-11-27 | 1944-11-28 | 0 | Details |
| US2363055A | Coating apparatus | Expired / Lapsed | 1943-05-29 | 1944-11-21 | 0 | Details |
| US2363359A | Electron microscope | Expired / Lapsed | 1942-09-11 | 1944-11-21 | 0 | Details |
| US2363375A | Butter conditioner | Expired / Lapsed | 1942-09-03 | 1944-11-21 | 0 | Details |
| US2363109A | Vapor lamp jacket | Expired / Lapsed | 1942-04-01 | 1944-11-21 | 0 | Details |
| US2362871A | Washing machine and method | Expired / Lapsed | 1940-02-21 | 1944-11-14 | 0 | Details |
| US2362235A | Apparatus for indicating variations in densities of transpa… | Expired / Lapsed | 1943-11-10 | 1944-11-07 | 0 | Details |
| US2362294A | Electric control circuit | Expired / Lapsed | 1941-10-01 | 1944-11-07 | 0 | Details |
| US2361495A | Flash lamp | Expired / Lapsed | 1941-12-23 | 1944-10-31 | 0 | Details |
| US2361846A | Electric valve circuits | Expired / Lapsed | 1939-01-25 | 1944-10-31 | 0 | Details |
| US2361845A | Electric valve circuit | Expired / Lapsed | 1938-05-07 | 1944-10-31 | 0 | Details |
| US2361239A | Fishing reel | Expired / Lapsed | 1943-04-28 | 1944-10-24 | 0 | Details |
| US2361187A | High frequency transformer arrangement | Expired / Lapsed | 1943-04-09 | 1944-10-24 | 0 | Details |
| US2360697A | Saw-tooth wave generation | Expired / Lapsed | 1942-01-27 | 1944-10-17 | 0 | Details |
| US2360157A | Oscillation damper | Expired / Lapsed | 1943-12-31 | 1944-10-10 | 0 | Details |
| US2360160A | Gas-arc welding apparatus | Expired / Lapsed | 1943-12-28 | 1944-10-10 | 0 | Details |
| US2360128A | Snap-action device | Expired / Lapsed | 1943-03-12 | 1944-10-10 | 0 | Details |
| US2359571A | Air circulating device | Expired / Lapsed | 1942-01-01 | 1944-10-03 | 0 | Details |
| US2359080A | Electric control circuit | Expired / Lapsed | 1942-09-30 | 1944-09-26 | 0 | Details |
| US2358810A | Apparatus for starting and controlling discharge devices | Expired / Lapsed | 1942-04-21 | 1944-09-26 | 0 | Details |
| US2359181A | Electric valve circuits | Expired / Lapsed | 1941-07-22 | 1944-09-26 | 0 | Details |
| US2358215A | Protective system | Expired / Lapsed | 1942-01-29 | 1944-09-12 | 0 | Details |
| US2357087A | Electric ship propulsion system | Expired / Lapsed | 1943-02-26 | 1944-08-29 | 0 | Details |
| US2356617A | Quick response direct-current instrument | Expired / Lapsed | 1943-01-25 | 1944-08-22 | 0 | Details |
| US2356567A | Control system | Expired / Lapsed | 1941-10-16 | 1944-08-22 | 0 | Details |
| US2355484A | Brake system | Expired / Lapsed | 1943-04-16 | 1944-08-08 | 0 | Details |
| US2354918A | Temperature control system for electric heating devices | Expired / Lapsed | 1942-08-26 | 1944-08-01 | 0 | Details |
| US2354032A | Synchronizing pulse separating circuit | Expired / Lapsed | 1943-01-19 | 1944-07-18 | 0 | Details |
| US2353660A | Starting control for electric discharge devices | Expired / Lapsed | 1942-12-17 | 1944-07-18 | 0 | Details |
| US2353743A | High-frequency electronic discharge device | Expired / Lapsed | 1941-08-26 | 1944-07-18 | 0 | Details |
| US2353770A | Method of carrying out electrothermic reactions | Expired / Lapsed | 1941-02-26 | 1944-07-18 | 0 | Details |
| US2353635A | Cathode for discharge tubes | Expired / Lapsed | 1941-02-11 | 1944-07-18 | 0 | Details |
| US2354081A | Method of forming contacts | Expired / Lapsed | 1940-01-20 | 1944-07-18 | 0 | Details |
| US2353201A | Aircraft cabin supercharger system | Expired / Lapsed | 1942-09-30 | 1944-07-11 | 0 | Details |
| US2353461A | Dry plate rectifier for portable radios | Expired / Lapsed | 1942-03-31 | 1944-07-11 | 0 | Details |
| US2352936A | Operating system for discharge lamps | Expired / Lapsed | 1942-07-21 | 1944-07-04 | 0 | Details |
| US2352455A | Frequency multiplier | Expired / Lapsed | 1943-09-30 | 1944-06-27 | 0 | Details |
| US2352159A | Terminal structure | Expired / Lapsed | 1942-06-27 | 1944-06-27 | 0 | Details |
| US2352231A | Electric valve control circuit | Expired / Lapsed | 1941-11-24 | 1944-06-27 | 0 | Details |
| US2352049A | Shock mounted instrument | Expired / Lapsed | 1942-11-07 | 1944-06-20 | 0 | Details |
| US2351564A | Electrical discharge device | Expired / Lapsed | 1942-05-02 | 1944-06-13 | 0 | Details |
| US2351543A | Electrical discharge device | Expired / Lapsed | 1942-05-02 | 1944-06-13 | 0 | Details |
| US2351439A | Electric valve oscillator | Expired / Lapsed | 1941-05-02 | 1944-06-13 | 0 | Details |
| US2350936A | Surface type heat exchanger | Expired / Lapsed | 1943-06-26 | 1944-06-06 | 0 | Details |
| US2350199A | Vinyl resin | Expired / Lapsed | 1943-10-01 | 1944-05-30 | 0 | Details |
| US2349622A | Manufacture of rectifiers of the blocking layer type | Expired / Lapsed | 1941-12-18 | 1944-05-23 | 0 | Details |
| US2348768A | Control mechanism | Expired / Lapsed | 1942-07-23 | 1944-05-16 | 0 | Details |
| US2348535A | Accounting apparatus | Expired / Lapsed | 1939-02-09 | 1944-05-09 | 0 | Details |
| US2348055A | Electric translating apparatus | Expired / Lapsed | 1942-12-29 | 1944-05-02 | 0 | Details |
| US2348016A | Countercircuit | Expired / Lapsed | 1941-11-13 | 1944-05-02 | 0 | Details |
| US2347517A | Dynamoelectric machine | Expired / Lapsed | 1942-07-01 | 1944-04-25 | 0 | Details |
| US2347452A | Battery servicing | Expired / Lapsed | 1942-02-17 | 1944-04-25 | 0 | Details |
| US2347055A | Electric lamp | Expired / Lapsed | 1943-01-06 | 1944-04-18 | 0 | Details |
| US2347034A | Turbine bucket wheel and the like | Expired / Lapsed | 1942-03-28 | 1944-04-18 | 0 | Details |
| US2346988A | Photographic printing apparatus | Expired / Lapsed | 1941-03-18 | 1944-04-18 | 0 | Details |
| US2345966A | Production of resins from furane derivatives | Expired / Lapsed | 1940-03-26 | 1944-04-04 | 0 | Details |
| US2345019A | Rotating coupling | Expired / Lapsed | 1942-04-29 | 1944-03-28 | 0 | Details |
| US2344820A | Electric blanket temperature control apparatus | Expired / Lapsed | 1942-10-01 | 1944-03-21 | 0 | Details |
| US2344122A | Electric lighting equipment | Expired / Lapsed | 1941-04-07 | 1944-03-14 | 0 | Details |
| US2343664A | Attachment plug | Expired / Lapsed | 1941-04-25 | 1944-03-07 | 0 | Details |
| US2343531A | Directive radiator | Expired / Lapsed | 1941-04-08 | 1944-03-07 | 0 | Details |
| US2341932A | Protective system | Expired / Lapsed | 1941-01-02 | 1944-02-15 | 0 | Details |
| US2340110A | Process for removing cations from liquid media | Expired / Lapsed | 1942-07-03 | 1944-01-25 | 0 | Details |
| US2340109A | Copolymer of divinyl benzene polymers and unsaturated alkyd… | Expired / Lapsed | 1942-06-23 | 1944-01-25 | 0 | Details |
| US2339768A | Synthetic condensation product | Expired / Lapsed | 1941-08-30 | 1944-01-25 | 0 | Details |
| US2340044A | Condensation product and process of making the same | Expired / Lapsed | 1941-08-30 | 1944-01-25 | 0 | Details |
| US2339608A | Frequency modulation system | Expired / Lapsed | 1942-08-17 | 1944-01-18 | 0 | Details |
| US2339635A | Control system | Expired / Lapsed | 1940-09-18 | 1944-01-18 | 0 | Details |
| US2338731A | Circuit controller | Expired / Lapsed | 1942-11-19 | 1944-01-11 | 0 | Details |
| US2339058A | Coating composition comprising partially polymerized allyl … | Expired / Lapsed | 1942-03-25 | 1944-01-11 | 0 | Details |
| US2339111A | Signaling apparatus | Expired / Lapsed | 1941-10-29 | 1944-01-11 | 0 | Details |
| US2339166A | Circular electric lamp | Expired / Lapsed | 1941-10-18 | 1944-01-11 | 0 | Details |
| US2339178A | Fluorescent tube coating | Expired / Lapsed | 1941-09-02 | 1944-01-11 | 0 | Details |
| US2338395A | Signal transmission system | Expired / Lapsed | 1940-06-25 | 1944-01-04 | 0 | Details |
| US2337932A | Electric control circuit | Expired / Lapsed | 1941-10-31 | 1943-12-28 | 0 | Details |
| US2337918A | Electric valve circuits | Expired / Lapsed | 1941-10-03 | 1943-12-28 | 0 | Details |
| US2337905A | Time delay relay | Expired / Lapsed | 1941-07-23 | 1943-12-28 | 0 | Details |
| US2337352A | Metal detector | Expired / Lapsed | 1942-08-24 | 1943-12-21 | 0 | Details |
| US2337361A | Pressure relief device | Expired / Lapsed | 1942-08-11 | 1943-12-21 | 0 | Details |
| US2337329A | Treatment of surfaces | Expired / Lapsed | 1941-12-18 | 1943-12-21 | 0 | Details |
| US2337437A | Lighting fixture | Expired / Lapsed | 1941-04-18 | 1943-12-21 | 0 | Details |
| US2337325A | Air circulating device | Expired / Lapsed | 1941-01-10 | 1943-12-21 | 0 | Details |
| US2336886A | Electric circuit | Expired / Lapsed | 1942-08-25 | 1943-12-14 | 0 | Details |
| US2336525A | Liquid-cooled lamp | Expired / Lapsed | 1940-12-06 | 1943-12-14 | 0 | Details |
| US2336232A | Gas turbine power unit | Expired / Lapsed | 1942-07-01 | 1943-12-07 | 0 | Details |
| US2336258A | Carrier current apparatus | Expired / Lapsed | 1942-03-07 | 1943-12-07 | 0 | Details |
| US2335705A | Signal-generating apparatus | Expired / Lapsed | 1940-10-10 | 1943-11-30 | 0 | Details |
| US2335659A | Light-controlling device | Expired / Lapsed | 1940-08-27 | 1943-11-30 | 0 | Details |
| US2335071A | Control system | Expired / Lapsed | 1942-07-03 | 1943-11-23 | 0 | Details |
| US2334584A | Method of making electric coils | Expired / Lapsed | 1942-05-19 | 1943-11-16 | 0 | Details |
| US2334530A | Protective means for transmitters | Expired / Lapsed | 1942-05-09 | 1943-11-16 | 0 | Details |
| US2334179A | Regulating and control circuit | Expired / Lapsed | 1941-12-16 | 1943-11-16 | 0 | Details |
| US2334579A | Indicating lamp receptacle | Expired / Lapsed | 1941-07-23 | 1943-11-16 | 0 | Details |
| US2334528A | Electrical control system | Expired / Lapsed | 1940-09-20 | 1943-11-16 | 0 | Details |
| US2334545A | Condensation product of a urea, an aliphatic aldehyde, and … | Expired / Lapsed | 1939-08-09 | 1943-11-16 | 0 | Details |
| US2333659A | Shielding for high frequency switches | Expired / Lapsed | 1941-10-02 | 1943-11-09 | 0 | Details |
| US2333969A | Television system and method of operation | Expired / Lapsed | 1941-05-27 | 1943-11-09 | 0 | Details |
| US2333990A | Tuning indication system | Expired / Lapsed | 1941-02-12 | 1943-11-09 | 0 | Details |
| US2333446A | Current responsive circuit | Expired / Lapsed | 1941-09-30 | 1943-11-02 | 0 | Details |
| US2333414A | Automatic record changer | Expired / Lapsed | 1940-09-19 | 1943-11-02 | 0 | Details |
| US2332911A | Snap action device | Expired / Lapsed | 1942-03-18 | 1943-10-26 | 0 | Details |
| US2333044A | Governing mechanism | Expired / Lapsed | 1941-05-07 | 1943-10-26 | 0 | Details |
| US2333015A | Variable reactance device | Expired / Lapsed | 1941-02-03 | 1943-10-26 | 0 | Details |
| US2332896A | Synthetic composition comprising hydrolyzed acetalized copo… | Expired / Lapsed | 1940-05-29 | 1943-10-26 | 0 | Details |
| US2332325A | Electric control circuit | Expired / Lapsed | 1942-03-06 | 1943-10-19 | 0 | Details |
| US2332300A | Interval timer | Expired / Lapsed | 1941-11-07 | 1943-10-19 | 0 | Details |
| US2331131A | Electric regulating circuit | Expired / Lapsed | 1940-09-28 | 1943-10-05 | 0 | Details |
| US2330638A | Electric control circuits | Expired / Lapsed | 1941-02-24 | 1943-09-28 | 0 | Details |
| US2330088A | Transformer system | Expired / Lapsed | 1942-03-20 | 1943-09-21 | 0 | Details |
| US2330033A | Method of preparing methylene malonic esters | Expired / Lapsed | 1939-11-16 | 1943-09-21 | 0 | Details |
| US2329541A | Electric measuring apparatus | Expired / Lapsed | 1941-06-18 | 1943-09-14 | 0 | Details |
| US2328443A | Multilayer electrical winding and method and apparatus for … | Expired / Lapsed | 1941-02-18 | 1943-08-31 | 0 | Details |
| US2327771A | Aminotriazine-aldehyde-halogenated acetone condensation pro… | Expired / Lapsed | 1941-01-15 | 1943-08-24 | 0 | Details |
| US2327774A | High frequency current transformer | Expired / Lapsed | 1940-10-31 | 1943-08-24 | 0 | Details |
| US2326538A | Receptacle for electric wiring systems | Expired / Lapsed | 1942-10-30 | 1943-08-10 | 0 | Details |
| US2326552A | Astronomical telescope | Expired / Lapsed | 1941-07-16 | 1943-08-10 | 0 | Details |
| US2326344A | Apparatus for detecting variations in wirelike bodies | Expired / Lapsed | 1941-06-25 | 1943-08-10 | 0 | Details |
| US2326515A | Television system | Expired / Lapsed | 1940-08-03 | 1943-08-10 | 0 | Details |
| US2325965A | Electric valve frequency changer | Expired / Lapsed | 1942-04-25 | 1943-08-03 | 0 | Details |
| US2325936A | Regulating circuit | Expired / Lapsed | 1941-11-25 | 1943-08-03 | 0 | Details |
| US2325935A | Electrical protective device | Expired / Lapsed | 1941-10-01 | 1943-08-03 | 0 | Details |
| US2325375A | Aminoplast modified with a malonic ester | Expired / Lapsed | 1940-07-23 | 1943-07-27 | 0 | Details |
| US2325366A | Modulation control system | Expired / Lapsed | 1940-07-23 | 1943-07-27 | 0 | Details |
| US2324844A | Remote control switch | Expired / Lapsed | 1940-12-18 | 1943-07-20 | 0 | Details |
| US2324374A | Apparatus for drilling diamonds and like purposes | Expired / Lapsed | 1942-03-12 | 1943-07-13 | 0 | Details |
| US2323924A | Superheterodyne receiver | Expired / Lapsed | 1941-12-11 | 1943-07-13 | 0 | Details |
| US2324314A | Electronic switch | Expired / Lapsed | 1941-11-13 | 1943-07-13 | 0 | Details |
| US2323956A | Oscillation generator | Expired / Lapsed | 1941-08-22 | 1943-07-13 | 0 | Details |
| US2324275A | Electric translating circuit | Expired / Lapsed | 1938-06-23 | 1943-07-13 | 0 | Details |
| US2323413A | Braking system | Expired / Lapsed | 1941-11-21 | 1943-07-06 | 0 | Details |
| US2322593A | Pressing iron | Expired / Lapsed | 1942-06-09 | 1943-06-22 | 0 | Details |
| US2321971A | Telemetering system | Expired / Lapsed | 1941-09-18 | 1943-06-15 | 0 | Details |
| US2322068A | Panel | Expired / Lapsed | 1941-09-12 | 1943-06-15 | 0 | Details |
| US2322162A | Control arrangement for signal devices | Expired / Lapsed | 1941-01-02 | 1943-06-15 | 0 | Details |
| US2322080A | Control for runout tables of reversing mills | Expired / Lapsed | 1940-11-06 | 1943-06-15 | 0 | Details |
| US2321386A | Position indicating device | Expired / Lapsed | 1942-10-05 | 1943-06-08 | 0 | Details |
| US2321424A | Testing of electrical windings | Expired / Lapsed | 1942-06-26 | 1943-06-08 | 0 | Details |
| US2320820A | Condensation products of an aminotriazole, an aldehyde, and… | Expired / Lapsed | 1942-03-19 | 1943-06-01 | 0 | Details |
| US2320790A | Electric valve circuits | Expired / Lapsed | 1942-02-03 | 1943-06-01 | 0 | Details |
| US2320117A | Electric control means | Expired / Lapsed | 1942-07-16 | 1943-05-25 | 0 | Details |
| US2319826A | Adhesive composition | Expired / Lapsed | 1941-10-10 | 1943-05-25 | 0 | Details |
| US2319780A | Laminated mica | Expired / Lapsed | 1941-05-02 | 1943-05-25 | 0 | Details |
| US2320208A | Contact amplifier | Expired / Lapsed | 1940-08-16 | 1943-05-25 | 0 | Details |
| US2319489A | Optical system | Expired / Lapsed | 1940-11-02 | 1943-05-18 | 0 | Details |
| US2319775A | Electromagnetic induction apparatus | Expired / Lapsed | 1940-09-05 | 1943-05-18 | 0 | Details |
| US2319576A | Peroxidized ester | Expired / Lapsed | 1940-03-27 | 1943-05-18 | 0 | Details |
| US2318358A | Condition control system | Expired / Lapsed | 1942-02-16 | 1943-05-04 | 0 | Details |
| US2318361A | Loop assembly | Expired / Lapsed | 1940-09-13 | 1943-05-04 | 0 | Details |
| US2317181A | Urea-formaldehyde-triethanolamine hydrochloride condensatio… | Expired / Lapsed | 1939-08-09 | 1943-04-20 | 0 | Details |
| US2316577A | Electronic regulator | Expired / Lapsed | 1942-07-04 | 1943-04-13 | 0 | Details |
| US2316008A | Electric control circuits | Expired / Lapsed | 1941-11-12 | 1943-04-06 | 0 | Details |
| US2315402A | Protein-modified aminotriazine-formaldehyde condensation pr… | Expired / Lapsed | 1940-10-19 | 1943-03-30 | 0 | Details |
| US2315313A | Cavity resonator | Expired / Lapsed | 1940-07-12 | 1943-03-30 | 0 | Details |
| US2315408A | Magnetic suspension | Expired / Lapsed | 1939-10-12 | 1943-03-30 | 0 | Details |
| US2314657A | Refrigerator | Expired / Lapsed | 1940-01-26 | 1943-03-23 | 0 | Details |
| US2314311A | Apparatus for starting and controlling electric discharge d… | Expired / Lapsed | 1942-04-21 | 1943-03-16 | 0 | Details |
| US2314190A | Refrigerating apparatus | Expired / Lapsed | 1941-02-21 | 1943-03-16 | 0 | Details |
| US2313597A | Thermal overload relay | Expired / Lapsed | 1941-11-08 | 1943-03-09 | 0 | Details |
| US2312974A | Electric control means | Expired / Lapsed | 1941-12-31 | 1943-03-02 | 0 | Details |
| US2312321A | Reaction product of aldehydes and guanazo triazines | Expired / Lapsed | 1941-09-30 | 1943-03-02 | 0 | Details |
| US2312888A | Magnetostriction measuring apparatus | Expired / Lapsed | 1941-05-31 | 1943-03-02 | 0 | Details |
| US2312117A | Control system | Expired / Lapsed | 1942-04-23 | 1943-02-23 | 0 | Details |
| US2312232A | Liquid-cooled lamp | Expired / Lapsed | 1941-12-22 | 1943-02-23 | 0 | Details |
| US2312073A | Electromagnetic induction apparatus | Expired / Lapsed | 1940-05-24 | 1943-02-23 | 0 | Details |
| US2312140A | Gap filler | Expired / Lapsed | 1940-05-08 | 1943-02-23 | 0 | Details |
| US2311462A | Control apparatus | Expired / Lapsed | 1942-10-16 | 1943-02-16 | 0 | Details |
| US2311396A | Vibration-free mounting | Expired / Lapsed | 1942-07-10 | 1943-02-16 | 0 | Details |
| US2311409A | Speed governor | Expired / Lapsed | 1941-12-03 | 1943-02-16 | 0 | Details |
| US2311382A | Magnetic suspension | Expired / Lapsed | 1940-10-04 | 1943-02-16 | 0 | Details |
| US2310261A | Pressure responsive device | Expired / Lapsed | 1941-02-01 | 1943-02-09 | 0 | Details |
| US2310101A | Excitation circuit for flectric valve apparatus | Expired / Lapsed | 1942-03-25 | 1943-02-02 | 0 | Details |
| US2310105A | Counter circuit | Expired / Lapsed | 1941-04-16 | 1943-02-02 | 0 | Details |
| US2310086A | Surface type heat exchanger | Expired / Lapsed | 1941-02-21 | 1943-02-02 | 0 | Details |
| US2310071A | Condenser winding machine | Expired / Lapsed | 1940-04-10 | 1943-02-02 | 0 | Details |
| US2309481A | Frequency monitoring system | Expired / Lapsed | 1941-03-01 | 1943-01-26 | 0 | Details |
| US2309431A | Shaver | Expired / Lapsed | 1940-10-31 | 1943-01-26 | 0 | Details |
| US2308495A | Interpolymerization product of an unsaturated alkyd resin a… | Expired / Lapsed | 1939-10-31 | 1943-01-19 | 0 | Details |
| US2308494A | Interpolymerization product of a polycrotyl ester and an un… | Expired / Lapsed | 1939-10-31 | 1943-01-19 | 0 | Details |
| US2308261A | Fluid pressure control system | Expired / Lapsed | 1939-12-06 | 1943-01-12 | 0 | Details |
| US2307588A | Insulated electrical conductor | Expired / Lapsed | 1938-07-08 | 1943-01-05 | 0 | Details |
| US2307488A | Electric capacitor | Expired / Lapsed | 1938-05-03 | 1943-01-05 | 0 | Details |
| US2306925A | Electrode and its fabrication | Expired / Lapsed | 1941-07-29 | 1942-12-29 | 0 | Details |
| US2306749A | Amplifying system | Expired / Lapsed | 1941-05-22 | 1942-12-29 | 0 | Details |
| US2306784A | Electric control circuit | Expired / Lapsed | 1940-12-17 | 1942-12-29 | 0 | Details |
| US2306626A | Luminescent composition | Expired / Lapsed | 1940-05-24 | 1942-12-29 | 0 | Details |
| US2306791A | Electric valve circuit | Expired / Lapsed | 1938-07-30 | 1942-12-29 | 0 | Details |
| US2306229A | Electric valve system | Expired / Lapsed | 1942-07-10 | 1942-12-22 | 0 | Details |
| US2306230A | Electric valve translating system | Expired / Lapsed | 1942-07-10 | 1942-12-22 | 0 | Details |
| US2306211A | Grading apparatus | Expired / Lapsed | 1941-06-17 | 1942-12-22 | 0 | Details |
| US2306222A | Method of rendering materials water repellent | Expired / Lapsed | 1940-11-16 | 1942-12-22 | 0 | Details |
| US2305436A | Fuse device | Expired / Lapsed | 1941-10-15 | 1942-12-15 | 0 | Details |
| US2305580A | Electric capacitor | Expired / Lapsed | 1941-08-09 | 1942-12-15 | 0 | Details |
| US2304834A | Coating apparatus | Expired / Lapsed | 1940-02-14 | 1942-12-15 | 0 | Details |
| US2304552A | Electric regulator | Expired / Lapsed | 1940-09-20 | 1942-12-08 | 0 | Details |
| US2303110A | Regulating system | Expired / Lapsed | 1941-03-20 | 1942-11-24 | 0 | Details |
| US2302447A | Compressor valve | Expired / Lapsed | 1941-08-30 | 1942-11-17 | 0 | Details |
| US2302493A | Amplifying system | Expired / Lapsed | 1941-01-28 | 1942-11-17 | 0 | Details |
| US2301008A | Temperature conditioning apparatus | Expired / Lapsed | 1942-01-01 | 1942-11-03 | 0 | Details |
| US2300910A | Transformer | Expired / Lapsed | 1940-09-10 | 1942-11-03 | 0 | Details |
| US2301007A | Constant temperature apparatus | Expired / Lapsed | 1940-06-22 | 1942-11-03 | 0 | Details |
| US2300223A | Transmission mechanism | Expired / Lapsed | 1941-10-04 | 1942-10-27 | 0 | Details |
| US2299750A | Cast glass article | Expired / Lapsed | 1939-11-22 | 1942-10-27 | 0 | Details |
| US2299501A | Control system | Expired / Lapsed | 1941-03-01 | 1942-10-20 | 0 | Details |
| US2299561A | Protective apparatus | Expired / Lapsed | 1940-09-06 | 1942-10-20 | 0 | Details |
| US2299554A | Washing machine | Expired / Lapsed | 1940-06-29 | 1942-10-20 | 0 | Details |
| US2299547A | Varnished sheet material | Expired / Lapsed | 1939-11-28 | 1942-10-20 | 0 | Details |
| US2298895A | Method of making heat exchange units | Expired / Lapsed | 1942-02-28 | 1942-10-13 | 0 | Details |
| US2298820A | Regulator system | Expired / Lapsed | 1941-09-06 | 1942-10-13 | 0 | Details |
| US2298885A | Method for producing high density sintered products | Expired / Lapsed | 1941-05-29 | 1942-10-13 | 0 | Details |
| US2298877A | Control system | Expired / Lapsed | 1941-03-22 | 1942-10-13 | 0 | Details |
| US2298864A | Synchronizing system | Expired / Lapsed | 1940-09-10 | 1942-10-13 | 0 | Details |
| US2298863A | Image transmission system | Expired / Lapsed | 1940-04-24 | 1942-10-13 | 0 | Details |
| US2298096A | Washing machine | Expired / Lapsed | 1942-02-20 | 1942-10-06 | 0 | Details |
| US2298026A | Control system | Expired / Lapsed | 1941-07-15 | 1942-10-06 | 0 | Details |
| US2298084A | Noise limiting circuit | Expired / Lapsed | 1941-06-14 | 1942-10-06 | 0 | Details |
| US2298095A | Washing machine | Expired / Lapsed | 1940-10-01 | 1942-10-06 | 0 | Details |
| US2298039A | Interpolymer of dimethyl itaconate and ethyl methacrylate | Expired / Lapsed | 1939-09-12 | 1942-10-06 | 0 | Details |
| US2297694A | Washing machine | Expired / Lapsed | 1939-03-25 | 1942-10-06 | 0 | Details |
| US2297357A | Method for brazing high carbon steel | Expired / Lapsed | 1940-10-19 | 1942-09-29 | 0 | Details |
| US2297605A | Transformer | Expired / Lapsed | 1939-08-02 | 1942-09-29 | 0 | Details |
| US2295293A | Electric system and indicating circuit therefor | Expired / Lapsed | 1942-03-16 | 1942-09-08 | 0 | Details |
| US2295031A | Cooling apparatus for electric lamps | Expired / Lapsed | 1940-08-03 | 1942-09-08 | 0 | Details |
| US2295328A | Protective device | Expired / Lapsed | 1940-06-25 | 1942-09-08 | 0 | Details |
| US2295297A | Protective system | Expired / Lapsed | 1939-08-19 | 1942-09-08 | 0 | Details |
| US2294672A | Electric valve circuit | Expired / Lapsed | 1942-02-28 | 1942-09-01 | 0 | Details |
| US2294741A | Remote indicator | Expired / Lapsed | 1941-12-03 | 1942-09-01 | 0 | Details |
| US2294756A | Method of manufacturing electrical resistors having negativ… | Expired / Lapsed | 1941-01-14 | 1942-09-01 | 0 | Details |
| US2294775A | Control system | Expired / Lapsed | 1940-11-01 | 1942-09-01 | 0 | Details |
| US2294664A | Clamp for window sill air conditioners | Expired / Lapsed | 1940-10-22 | 1942-09-01 | 0 | Details |
| US2294730A | Projectile timer | Expired / Lapsed | 1940-09-23 | 1942-09-01 | 0 | Details |
| US2294692A | Measurement of volt ampere demand | Expired / Lapsed | 1940-02-24 | 1942-09-01 | 0 | Details |
| US2294226A | Preparation of granulated polymers and copolymers | Expired / Lapsed | 1939-10-28 | 1942-08-25 | 0 | Details |
| US2294209A | Frequency modulation system | Expired / Lapsed | 1938-11-12 | 1942-08-25 | 0 | Details |
| US2293485A | Piezoelectric device holder | Expired / Lapsed | 1941-11-04 | 1942-08-18 | 0 | Details |
| US2293508A | Dynamoelectric machine | Expired / Lapsed | 1941-03-29 | 1942-08-18 | 0 | Details |
| US2293502A | Electric measuring apparatus | Expired / Lapsed | 1940-04-10 | 1942-08-18 | 0 | Details |
| US2292844A | Regulating system | Expired / Lapsed | 1941-05-09 | 1942-08-11 | 0 | Details |
| US2292815A | Washing machine | Expired / Lapsed | 1940-09-21 | 1942-08-11 | 0 | Details |
| US2292105A | Fluid pressure brake equipment | Expired / Lapsed | 1942-01-06 | 1942-08-04 | 0 | Details |
| US2292095A | Electric circuit breaker | Expired / Lapsed | 1940-09-12 | 1942-08-04 | 0 | Details |
| US2291965A | Electrical discharge device | Expired / Lapsed | 1940-09-09 | 1942-08-04 | 0 | Details |
| US2292174A | Electric protective apparatus | Expired / Lapsed | 1940-02-27 | 1942-08-04 | 0 | Details |
| US2292063A | Muting control | Expired / Lapsed | 1938-04-23 | 1942-08-04 | 0 | Details |
| US2291342A | Electric valve circuit | Expired / Lapsed | 1941-07-23 | 1942-07-28 | 0 | Details |
| US2291344A | Apparatus for manufacturing insulated wire | Expired / Lapsed | 1941-06-11 | 1942-07-28 | 0 | Details |
| US2290713A | Grille for air circulators | Expired / Lapsed | 1940-03-30 | 1942-07-21 | 0 | Details |
| US2288364A | High frequency electric valve generator | Expired / Lapsed | 1941-04-15 | 1942-06-30 | 0 | Details |
| US2288295A | Electric valve control circuit | Expired / Lapsed | 1940-10-31 | 1942-06-30 | 0 | Details |
| US2288387A | Apparatus for straightening woven material | Expired / Lapsed | 1939-12-29 | 1942-06-30 | 0 | Details |
| US2288339A | Electric motor control system | Expired / Lapsed | 1938-12-23 | 1942-06-30 | 0 | Details |
| US2287583A | Coffee maker | Expired / Lapsed | 1940-09-18 | 1942-06-23 | 0 | Details |
| US2287628A | Washing apparatus | Expired / Lapsed | 1939-10-26 | 1942-06-23 | 0 | Details |
| US2286802A | Locking means for anode structures | Expired / Lapsed | 1941-11-21 | 1942-06-16 | 0 | Details |
| US2286755A | Anode locking system | Expired / Lapsed | 1941-06-04 | 1942-06-16 | 0 | Details |
| US2286750A | Dynamoelectric machine | Expired / Lapsed | 1940-07-26 | 1942-06-16 | 0 | Details |
| US2285896A | Automatic amplification control | Expired / Lapsed | 1941-07-23 | 1942-06-09 | 0 | Details |
| US2285969A | Telemetric system | Expired / Lapsed | 1941-05-07 | 1942-06-09 | 0 | Details |
| US2284392A | Electrical connector | Expired / Lapsed | 1941-01-10 | 1942-05-26 | 0 | Details |
| US2284405A | High frequency apparatus | Expired / Lapsed | 1940-08-17 | 1942-05-26 | 0 | Details |
| US2284378A | Deflecting circuit | Expired / Lapsed | 1940-05-03 | 1942-05-26 | 0 | Details |
| US2284406A | Transformer | Expired / Lapsed | 1940-03-01 | 1942-05-26 | 0 | Details |
| US2284407A | Vibrator inverter system | Expired / Lapsed | 1939-05-27 | 1942-05-26 | 0 | Details |
| US2283741A | Control system | Expired / Lapsed | 1941-04-02 | 1942-05-19 | 0 | Details |
| US2283719A | Electric valve circuits | Expired / Lapsed | 1941-02-03 | 1942-05-19 | 0 | Details |
| US2283750A | Apparatus for measuring the density of gases | Expired / Lapsed | 1940-01-16 | 1942-05-19 | 0 | Details |
| US2282847A | Washing machine | Expired / Lapsed | 1941-03-13 | 1942-05-12 | 0 | Details |
| US2282894A | Elastic fluid turbine | Expired / Lapsed | 1940-04-02 | 1942-05-12 | 0 | Details |
| US2282832A | Semiconducting tape | Expired / Lapsed | 1939-11-24 | 1942-05-12 | 0 | Details |
| US2282383A | Audio frequency amplifier | Expired / Lapsed | 1939-09-13 | 1942-05-12 | 0 | Details |
| US2282382A | Amplifier system | Expired / Lapsed | 1939-08-19 | 1942-05-12 | 0 | Details |
| US2282381A | Amplifier | Expired / Lapsed | 1939-06-20 | 1942-05-12 | 0 | Details |
| US2282340A | Relaxation oscillator | Expired / Lapsed | 1939-06-10 | 1942-05-12 | 0 | Details |
| US2282882A | Gel composition and method of preparation | Expired / Lapsed | 1938-05-28 | 1942-05-12 | 0 | Details |
| US2282007A | Control of motor operated devices | Expired / Lapsed | 1940-06-25 | 1942-05-05 | 0 | Details |
| US2282106A | Ceramic-to-metal seal | Expired / Lapsed | 1939-07-14 | 1942-05-05 | 0 | Details |
| US2281948A | Relaxation oscillator | Expired / Lapsed | 1938-12-30 | 1942-05-05 | 0 | Details |
| US2281325A | Electron microscope | Expired / Lapsed | 1941-08-20 | 1942-04-28 | 0 | Details |
| US2281319A | Control device | Expired / Lapsed | 1940-12-31 | 1942-04-28 | 0 | Details |
| US2281280A | Light relay | Expired / Lapsed | 1940-05-10 | 1942-04-28 | 0 | Details |
| US2280522A | Apparatus for feeding cylindrical metal shells | Expired / Lapsed | 1940-11-30 | 1942-04-21 | 0 | Details |
| US2280749A | Electric valve converting system | Expired / Lapsed | 1940-11-28 | 1942-04-21 | 0 | Details |
| US2280531A | Oscillograph apparatus | Expired / Lapsed | 1940-11-01 | 1942-04-21 | 0 | Details |
| US2280524A | Electrical wave analysis | Expired / Lapsed | 1940-11-01 | 1942-04-21 | 0 | Details |
| US2280573A | Filament transporting method and apparatus | Expired / Lapsed | 1938-11-16 | 1942-04-21 | 0 | Details |
| US2279878A | Washing machine | Expired / Lapsed | 1940-02-07 | 1942-04-14 | 0 | Details |
| US2279846A | Temperature measuring apparatus | Expired / Lapsed | 1940-01-27 | 1942-04-14 | 0 | Details |
| US2279881A | Interpolymer of di-(secondary butyl) itaconate and ethyl me… | Expired / Lapsed | 1939-09-12 | 1942-04-14 | 0 | Details |
| US2279884A | Interpolymers of dibenzyl itaconate and ethyl methacrylate | Expired / Lapsed | 1939-09-12 | 1942-04-14 | 0 | Details |
| US2279819A | Signal receiving system | Expired / Lapsed | 1936-06-13 | 1942-04-14 | 0 | Details |
| US2279019A | Hydraulic vehicle power transmission | Expired / Lapsed | 1939-11-27 | 1942-04-07 | 0 | Details |
| US2279268A | Calorized metal and method for producing the same | Expired / Lapsed | 1939-05-16 | 1942-04-07 | 0 | Details |
| US2278742A | Method of forming luminescent screens | Expired / Lapsed | 1938-04-14 | 1942-04-07 | 0 | Details |
| US2278242A | Evaporative cooler | Expired / Lapsed | 1940-12-28 | 1942-03-31 | 0 | Details |
| US2278151A | Regulating apparatus | Expired / Lapsed | 1940-12-11 | 1942-03-31 | 0 | Details |
| US2278212A | Electric control system | Expired / Lapsed | 1940-09-28 | 1942-03-31 | 0 | Details |
| US2278249A | Hydraulic control mechanism | Expired / Lapsed | 1940-07-20 | 1942-03-31 | 0 | Details |
| US2277414A | Electron lens | Expired / Lapsed | 1941-07-02 | 1942-03-24 | 0 | Details |
| US2277037A | Fruit ripeness tester | Expired / Lapsed | 1940-01-16 | 1942-03-24 | 0 | Details |
| US2277427A | Multiple sequence recorder | Expired / Lapsed | 1939-06-09 | 1942-03-24 | 0 | Details |
| US2277464A | Radio locating and following system | Expired / Lapsed | 1938-12-13 | 1942-03-24 | 0 | Details |
| US2276855A | Electrical induction apparatus | Expired / Lapsed | 1940-11-22 | 1942-03-17 | 0 | Details |
| US2276830A | Safety diaphragm | Expired / Lapsed | 1940-09-11 | 1942-03-17 | 0 | Details |
| US2276806A | High frequency apparatus | Expired / Lapsed | 1940-07-26 | 1942-03-17 | 0 | Details |
| US2276822A | Temperature control system | Expired / Lapsed | 1939-12-19 | 1942-03-17 | 0 | Details |
| US2276847A | Method of brazing | Expired / Lapsed | 1939-09-28 | 1942-03-17 | 0 | Details |
| US2276752A | Electric control circuits | Expired / Lapsed | 1939-08-25 | 1942-03-17 | 0 | Details |
| US2276843A | Pressure measuring apparatus | Expired / Lapsed | 1939-03-31 | 1942-03-17 | 0 | Details |
| US2275864A | Cathode ray tube | Expired / Lapsed | 1940-11-27 | 1942-03-10 | 0 | Details |
| US2275883A | Ground detector | Expired / Lapsed | 1939-11-01 | 1942-03-10 | 0 | Details |
| US2274364A | Voltage regulator circuit | Expired / Lapsed | 1940-03-08 | 1942-02-24 | 0 | Details |
| US2274365A | Voltage regulator | Expired / Lapsed | 1940-03-08 | 1942-02-24 | 0 | Details |
| US2274422A | Electrical connection | Expired / Lapsed | 1940-01-20 | 1942-02-24 | 0 | Details |
| US2274402A | Washing machine | Expired / Lapsed | 1939-12-29 | 1942-02-24 | 0 | Details |
| US2274366A | Television scanning | Expired / Lapsed | 1939-03-01 | 1942-02-24 | 0 | Details |
| US2272756A | Regulating apparatus | Expired / Lapsed | 1940-11-01 | 1942-02-10 | 0 | Details |
| US2272768A | Frequency modulation measurement | Expired / Lapsed | 1940-06-21 | 1942-02-10 | 0 | Details |
| US2272772A | Electrical measuring apparatus | Expired / Lapsed | 1940-06-04 | 1942-02-10 | 0 | Details |
| US2272769A | Control modulating system | Expired / Lapsed | 1940-03-30 | 1942-02-10 | 0 | Details |
| US2272841A | Electron multiplier | Expired / Lapsed | 1939-11-15 | 1942-02-10 | 0 | Details |
| US2272770A | Gaseous electric discharge apparatus | Expired / Lapsed | 1939-10-24 | 1942-02-10 | 0 | Details |
| US2271987A | Resistance welding apparatus | Expired / Lapsed | 1941-10-08 | 1942-02-03 | 0 | Details |
| US2271219A | Dry plate element and method of producing the same | Expired / Lapsed | 1939-08-22 | 1942-01-27 | 0 | Details |
| US2270899A | Frequency modulation system | Expired / Lapsed | 1938-11-12 | 1942-01-27 | 0 | Details |
| US2270750A | Washing machine | Expired / Lapsed | 1940-02-29 | 1942-01-20 | 0 | Details |
| US2269990A | Polyvinyl halide composition | Expired / Lapsed | 1940-06-08 | 1942-01-13 | 0 | Details |
| US2269967A | Electric valve control system | Expired / Lapsed | 1940-01-05 | 1942-01-13 | 0 | Details |
| US2270167A | Sound device with piezoelectric double plates | Expired / Lapsed | 1939-04-20 | 1942-01-13 | 0 | Details |
| US2269195A | Electric heater | Expired / Lapsed | 1940-12-18 | 1942-01-06 | 0 | Details |
| US2269226A | Cathode ray oscillograph control | Expired / Lapsed | 1940-11-15 | 1942-01-06 | 0 | Details |
| US2269242A | Magnetic contact device | Expired / Lapsed | 1940-11-05 | 1942-01-06 | 0 | Details |
| US2269227A | Short range electrical measuring apparatus | Expired / Lapsed | 1940-07-06 | 1942-01-06 | 0 | Details |
| US2269194A | Electric heater | Expired / Lapsed | 1939-12-19 | 1942-01-06 | 0 | Details |
| US2269240A | Recording instrument | Expired / Lapsed | 1939-12-01 | 1942-01-06 | 0 | Details |
| US2269185A | Method of forming coil insulation | Expired / Lapsed | 1939-11-15 | 1942-01-06 | 0 | Details |
| US2269152A | Foil gauge | Expired / Lapsed | 1938-07-09 | 1942-01-06 | 0 | Details |
| US2269190A | Washing machine | Expired / Lapsed | 1937-11-11 | 1942-01-06 | 0 | Details |
| US2269151A | Electric control circuits | Expired / Lapsed | 1937-04-24 | 1942-01-06 | 0 | Details |
| US2267404A | Electric control system | Expired / Lapsed | 1940-05-31 | 1941-12-23 | 0 | Details |
| US2267395A | Control system | Expired / Lapsed | 1940-05-11 | 1941-12-23 | 0 | Details |
| US2266616A | Electric discharge lamp circuit | Expired / Lapsed | 1940-06-06 | 1941-12-16 | 0 | Details |
| US2266608A | Pressure measuring apparatus | Expired / Lapsed | 1940-02-13 | 1941-12-16 | 0 | Details |
| US2266595A | Electric discharge device | Expired / Lapsed | 1939-10-27 | 1941-12-16 | 0 | Details |
| US2266619A | Circuit for electric discharge devices | Expired / Lapsed | 1939-10-05 | 1941-12-16 | 0 | Details |
| US2266566A | Means for measuring or gauging the size of orifices or arti… | Expired / Lapsed | 1939-08-31 | 1941-12-16 | 0 | Details |
| US2266569A | Temperature control system | Expired / Lapsed | 1939-08-18 | 1941-12-16 | 0 | Details |
| US2266624A | Hook-on meter | Expired / Lapsed | 1939-03-18 | 1941-12-16 | 0 | Details |
| US2265693A | Refrigerator cabinet gasket | Expired / Lapsed | 1940-09-07 | 1941-12-09 | 0 | Details |
| US2265717A | Electric translating apparatus | Expired / Lapsed | 1940-06-28 | 1941-12-09 | 0 | Details |
| US2265689A | Thermionic amplifier | Expired / Lapsed | 1940-05-29 | 1941-12-09 | 0 | Details |
| US2265796A | Short wave oscillator | Expired / Lapsed | 1939-12-02 | 1941-12-09 | 0 | Details |
| US2265381A | Exhaust machine | Expired / Lapsed | 1939-05-26 | 1941-12-09 | 0 | Details |
| US2265359A | Process and apparatus for sealingoff vessels containing gas | Expired / Lapsed | 1937-06-19 | 1941-12-09 | 0 | Details |
| US2264877A | Elastic fluid turbine diaphragm | Expired / Lapsed | 1940-11-15 | 1941-12-02 | 0 | Details |
| US2264541A | Electron discharge device | Expired / Lapsed | 1938-12-14 | 1941-12-02 | 0 | Details |
| US2264073A | Temperature compensating resistor and method of making the … | Expired / Lapsed | 1941-02-06 | 1941-11-25 | 0 | Details |
| US2264055A | Starting circuit for electric discharge devices | Expired / Lapsed | 1939-04-03 | 1941-11-25 | 0 | Details |
| US2263324A | Reversible capactior motor | Expired / Lapsed | 1941-06-27 | 1941-11-18 | 0 | Details |
| US2263319A | Bushing terminal guard | Expired / Lapsed | 1940-12-03 | 1941-11-18 | 0 | Details |
| US2262629A | Base for electric lamp or similar device | Expired / Lapsed | 1940-02-14 | 1941-11-11 | 0 | Details |
| US2262177A | Lighting and radiating tube | Expired / Lapsed | 1930-12-05 | 1941-11-11 | 0 | Details |
| US2261643A | Noise suppression circuit | Expired / Lapsed | 1940-10-23 | 1941-11-04 | 0 | Details |
| US2261644A | Photoelectric contour follower | Expired / Lapsed | 1940-04-03 | 1941-11-04 | 0 | Details |
| US2261645A | Protective system | Expired / Lapsed | 1940-02-27 | 1941-11-04 | 0 | Details |
| US2260837A | Pressure measuring apparatus | Expired / Lapsed | 1940-07-26 | 1941-10-28 | 0 | Details |
| US2260844A | Ultra high frequency converter | Expired / Lapsed | 1940-03-12 | 1941-10-28 | 0 | Details |
| US2260810A | Control system | Expired / Lapsed | 1940-03-07 | 1941-10-28 | 0 | Details |
| US2260840A | Temperature control system | Expired / Lapsed | 1939-08-19 | 1941-10-28 | 0 | Details |
| US2260041A | Electron microscope | Expired / Lapsed | 1940-09-20 | 1941-10-21 | 0 | Details |
| US2260036A | Transmission dynamometer | Expired / Lapsed | 1940-08-24 | 1941-10-21 | 0 | Details |
| US2259998A | Automatic gain controlled amplifier | Expired / Lapsed | 1940-07-23 | 1941-10-21 | 0 | Details |
| US2259982A | Radio distance meter | Expired / Lapsed | 1939-09-29 | 1941-10-21 | 0 | Details |
| US2260055A | Magnetic tool | Expired / Lapsed | 1939-09-19 | 1941-10-21 | 0 | Details |
| US2260012A | Electric valve circuit | Expired / Lapsed | 1939-03-01 | 1941-10-21 | 0 | Details |
| US2260024A | Insulated electrical conductor | Expired / Lapsed | 1938-09-01 | 1941-10-21 | 0 | Details |
| US2259139A | Recording apparatus | Expired / Lapsed | 1940-02-24 | 1941-10-14 | 0 | Details |
| US2259138A | Method of preparing electrically insulating material | Expired / Lapsed | 1939-03-20 | 1941-10-14 | 0 | Details |
| US2259115A | Control system | Expired / Lapsed | 1938-09-10 | 1941-10-14 | 0 | Details |
| US2259040A | Electric discharge lamp | Expired / Lapsed | 1938-08-06 | 1941-10-14 | 0 | Details |
| US2258220A | Resinous materials and insulated conductors and other produ… | Expired / Lapsed | 1940-04-27 | 1941-10-07 | 0 | Details |
| US2258222A | Methyl aryl silicones and insulated conductors and other pr… | Expired / Lapsed | 1940-04-27 | 1941-10-07 | 0 | Details |
| US2258221A | Aroxy silicones and insulated conductors and other products… | Expired / Lapsed | 1940-04-27 | 1941-10-07 | 0 | Details |
| US2258219A | Halogenated aryl silicones | Expired / Lapsed | 1939-09-27 | 1941-10-07 | 0 | Details |
| US2258218A | Methyl silicones and related products | Expired / Lapsed | 1939-08-01 | 1941-10-07 | 0 | Details |
| US2256206A | Refrigerator cabinet | Expired / Lapsed | 1938-04-06 | 1941-09-16 | 0 | Details |
| US2255488A | Control system | Expired / Lapsed | 1940-05-25 | 1941-09-09 | 0 | Details |
| US2255485A | Television receiver | Expired / Lapsed | 1939-12-15 | 1941-09-09 | 0 | Details |
| US2255501A | Electric switch | Expired / Lapsed | 1939-12-12 | 1941-09-09 | 0 | Details |
| US2255476A | High efficiency amplifier | Expired / Lapsed | 1939-02-09 | 1941-09-09 | 0 | Details |
| US2255484A | Automatic background control for television systems | Expired / Lapsed | 1938-11-30 | 1941-09-09 | 0 | Details |
| US2255483A | Inhibited polymerizable unsaturated organic compound | Expired / Lapsed | 1938-10-01 | 1941-09-09 | 0 | Details |
| US2255487A | Synthetic resinous compositions | Expired / Lapsed | 1938-04-12 | 1941-09-09 | 0 | Details |
| US2254727A | Discharge device | Expired / Lapsed | 1940-10-22 | 1941-09-02 | 0 | Details |
| US2254698A | Magnetic system | Expired / Lapsed | 1940-10-04 | 1941-09-02 | 0 | Details |
| US2254697A | Antenna system | Expired / Lapsed | 1940-03-25 | 1941-09-02 | 0 | Details |
| US2253987A | Terminal for gas filled cables | Expired / Lapsed | 1940-05-11 | 1941-08-26 | 0 | Details |
| US2253967A | Insulated electrical conductor | Expired / Lapsed | 1939-07-21 | 1941-08-26 | 0 | Details |
| US2253183A | Spring drive mechanism | Expired / Lapsed | 1940-09-05 | 1941-08-19 | 0 | Details |
| US2253185A | Electric discharge apparatus | Expired / Lapsed | 1940-08-31 | 1941-08-19 | 0 | Details |
| US2253170A | Door operating mechanism | Expired / Lapsed | 1939-08-25 | 1941-08-19 | 0 | Details |
| US2253129A | Circuit interrupter | Expired / Lapsed | 1932-01-07 | 1941-08-19 | 0 | Details |
| US2252476A | Base for electric lamps | Expired / Lapsed | 1940-11-29 | 1941-08-12 | 0 | Details |
| US2252457A | Relay apparatus | Expired / Lapsed | 1940-07-13 | 1941-08-12 | 0 | Details |
| US2252498A | Apparatus for feeding glass flares | Expired / Lapsed | 1939-04-27 | 1941-08-12 | 0 | Details |
| US2252495A | Vitreous composition | Expired / Lapsed | 1938-06-28 | 1941-08-12 | 0 | Details |
| US2251631A | Inductance device | Expired / Lapsed | 1939-12-29 | 1941-08-05 | 0 | Details |
| US2250986A | Vacuum-tight metal-to-ceramic seal and method of making same | Expired / Lapsed | 1940-09-05 | 1941-07-29 | 0 | Details |
| US2251158A | Transfer and orienting mechanism | Expired / Lapsed | 1939-07-20 | 1941-07-29 | 0 | Details |
| US2250940A | Art of welding | Expired / Lapsed | 1939-05-26 | 1941-07-29 | 0 | Details |
| US2251046A | Gaseous electric discharge device | Expired / Lapsed | 1932-04-20 | 1941-07-29 | 0 | Details |
| US2251045A | Gaseous electric discharge device | Expired / Lapsed | 1930-04-24 | 1941-07-29 | 0 | Details |
| US2250207A | Temperature control system | Expired / Lapsed | 1939-12-16 | 1941-07-22 | 0 | Details |
| US2250209A | Control system | Expired / Lapsed | 1939-11-17 | 1941-07-22 | 0 | Details |
| US2250202A | Control device for electric translating apparatus | Expired / Lapsed | 1938-07-19 | 1941-07-22 | 0 | Details |
| US2249501A | Shaft supporting and lubricating arrangement | Expired / Lapsed | 1940-10-17 | 1941-07-15 | 0 | Details |
| US2249488A | Timing device | Expired / Lapsed | 1940-04-10 | 1941-07-15 | 0 | Details |
| US2249457A | Arc welding system | Expired / Lapsed | 1940-02-24 | 1941-07-15 | 0 | Details |
| US2249494A | High frequency apparatus | Expired / Lapsed | 1939-12-22 | 1941-07-15 | 0 | Details |
| US2249474A | Electric terminal | Expired / Lapsed | 1939-10-26 | 1941-07-15 | 0 | Details |
| US2249454A | Magnetic novelty | Expired / Lapsed | 1939-06-22 | 1941-07-15 | 0 | Details |
| US2249498A | Coating composition | Expired / Lapsed | 1939-02-23 | 1941-07-15 | 0 | Details |
| US2249672A | Discharge device | Expired / Lapsed | 1937-03-15 | 1941-07-15 | 0 | Details |
| US2248581A | Deflecting circuits | Expired / Lapsed | 1940-07-10 | 1941-07-08 | 0 | Details |
| US2248586A | Frequency meter | Expired / Lapsed | 1940-07-06 | 1941-07-08 | 0 | Details |
| US2248574A | Electric ignition system | Expired / Lapsed | 1940-03-06 | 1941-07-08 | 0 | Details |
| US2248621A | Method of fabricating welded assemblies | Expired / Lapsed | 1938-12-13 | 1941-07-08 | 0 | Details |
| US2247890A | Core for electrical apparatus | Expired / Lapsed | 1940-01-26 | 1941-07-01 | 0 | Details |
| US2247513A | Exhausting machine | Expired / Lapsed | 1939-11-09 | 1941-07-01 | 0 | Details |
| US2247805A | Light or exposure meter | Expired / Lapsed | 1939-08-25 | 1941-07-01 | 0 | Details |
| US2247804A | Permanent magnet | Expired / Lapsed | 1939-02-23 | 1941-07-01 | 0 | Details |
| US2247077A | High frequency electronic apparatus | Expired / Lapsed | 1940-07-27 | 1941-06-24 | 0 | Details |
| US2247113A | Optical alignment device | Expired / Lapsed | 1939-12-19 | 1941-06-24 | 0 | Details |
| US2247056A | Condenser control apparatus | Expired / Lapsed | 1939-10-05 | 1941-06-24 | 0 | Details |
| US2247076A | Tuning instrument | Expired / Lapsed | 1939-08-25 | 1941-06-24 | 0 | Details |
| US2247166A | Dynamo regulator system | Expired / Lapsed | 1939-06-24 | 1941-06-24 | 0 | Details |
| US2247057A | Electric valve converting system | Expired / Lapsed | 1939-05-20 | 1941-06-24 | 0 | Details |
| US2247198A | Electric mixed light lamp with mercury pressure discharge f… | Expired / Lapsed | 1939-02-02 | 1941-06-24 | 0 | Details |
| US2247060A | Gas furnace control | Expired / Lapsed | 1938-07-20 | 1941-06-24 | 0 | Details |
| US2246177A | Electric control circuit | Expired / Lapsed | 1940-08-02 | 1941-06-17 | 0 | Details |
| US2246131A | Electron emitting body | Expired / Lapsed | 1940-06-12 | 1941-06-17 | 0 | Details |
| US2246158A | Amplifier | Expired / Lapsed | 1939-08-17 | 1941-06-17 | 0 | Details |
| US2246161A | Selenium cells and method of producing the same | Expired / Lapsed | 1939-06-05 | 1941-06-17 | 0 | Details |
| US2246169A | Governing mechanism for elastic fluid turbines | Expired / Lapsed | 1939-04-05 | 1941-06-17 | 0 | Details |
| US2246239A | Wound core assembling arrangement | Expired / Lapsed | 1938-03-22 | 1941-06-17 | 0 | Details |
| US2244373A | Fluid flow responsive switching device | Expired / Lapsed | 1939-01-14 | 1941-06-03 | 0 | Details |
| US2243555A | Magnet gearing | Expired / Lapsed | 1940-08-21 | 1941-05-27 | 0 | Details |
| US2243553A | Electrical winding | Expired / Lapsed | 1940-02-24 | 1941-05-27 | 0 | Details |
| US2243566A | Electric switch | Expired / Lapsed | 1939-04-13 | 1941-05-27 | 0 | Details |
| US2243071A | Furnace control system | Expired / Lapsed | 1939-04-01 | 1941-05-27 | 0 | Details |
| US2243065A | Molded box | Expired / Lapsed | 1938-09-10 | 1941-05-27 | 0 | Details |
| US2242764A | Freezing tray | Expired / Lapsed | 1939-10-24 | 1941-05-20 | 0 | Details |
| US2241973A | Electroresponsive device | Expired / Lapsed | 1940-05-15 | 1941-05-13 | 0 | Details |
| US2242011A | Strain gauge | Expired / Lapsed | 1940-02-01 | 1941-05-13 | 0 | Details |
| US2241950A | Luminescent material | Expired / Lapsed | 1939-12-20 | 1941-05-13 | 0 | Details |
| US2242008A | Dynamoelectric machine | Expired / Lapsed | 1939-10-25 | 1941-05-13 | 0 | Details |
| US2241060A | Heat pump system | Expired / Lapsed | 1939-08-24 | 1941-05-06 | 0 | Details |
| US2241070A | Heat pump system | Expired / Lapsed | 1939-07-15 | 1941-05-06 | 0 | Details |
| US2240184A | Electric gauge | Expired / Lapsed | 1938-03-26 | 1941-04-29 | 0 | Details |
| US2240331A | Lamp string | Expired / Lapsed | 1937-10-30 | 1941-04-29 | 0 | Details |
| US2239436A | Frequency controlling system | Expired / Lapsed | 1938-04-28 | 1941-04-22 | 0 | Details |
| US2238810A | Electric control system | Expired / Lapsed | 1940-01-27 | 1941-04-15 | 0 | Details |
| US2238784A | Electric discharge device | Expired / Lapsed | 1939-12-19 | 1941-04-15 | 0 | Details |
| US2237811A | Strip width indicating device | Expired / Lapsed | 1940-07-13 | 1941-04-08 | 0 | Details |
| US2237754A | Electric lamp | Expired / Lapsed | 1939-10-18 | 1941-04-08 | 0 | Details |
| US2237802A | Method of treating dry plate elements | Expired / Lapsed | 1939-06-05 | 1941-04-08 | 0 | Details |
| US2237796A | Mixer circuit | Expired / Lapsed | 1939-04-21 | 1941-04-08 | 0 | Details |
| US2237803A | Control means for gas filled cables | Expired / Lapsed | 1939-01-17 | 1941-04-08 | 0 | Details |
| US2237003A | Vibrator current-converting system | Expired / Lapsed | 1940-06-14 | 1941-04-01 | 0 | Details |
| US2236985A | Oscillator | Expired / Lapsed | 1939-10-28 | 1941-04-01 | 0 | Details |
| US2237015A | Electric control system | Expired / Lapsed | 1939-06-24 | 1941-04-01 | 0 | Details |
| US2236998A | Resistance welding | Expired / Lapsed | 1939-06-23 | 1941-04-01 | 0 | Details |
| US2237006A | Electric hygrometer | Expired / Lapsed | 1938-04-21 | 1941-04-01 | 0 | Details |
| US2236984A | Electric motor control system | Expired / Lapsed | 1937-10-19 | 1941-04-01 | 0 | Details |
| US2236299A | Traffic signal controller | Expired / Lapsed | 1940-03-21 | 1941-03-25 | 0 | Details |
| US2236276A | Sequence control system | Expired / Lapsed | 1939-09-16 | 1941-03-25 | 0 | Details |
| US2236298A | Traffic signal controller | Expired / Lapsed | 1938-04-23 | 1941-03-25 | 0 | Details |
| US2235550A | Amplifier | Expired / Lapsed | 1938-11-15 | 1941-03-18 | 0 | Details |
| US2235523A | Electric cord | Expired / Lapsed | 1938-11-12 | 1941-03-18 | 0 | Details |
| US2235551A | Electric control system | Expired / Lapsed | 1938-07-15 | 1941-03-18 | 0 | Details |
| US2234741A | Coffee maker | Expired / Lapsed | 1939-12-01 | 1941-03-11 | 0 | Details |
| US2234720A | Electron discharge apparatus | Expired / Lapsed | 1939-08-10 | 1941-03-11 | 0 | Details |
| US2234713A | Refrigerant evaporator | Expired / Lapsed | 1939-07-21 | 1941-03-11 | 0 | Details |
| US2234757A | Cooling arrangement for gas turbines | Expired / Lapsed | 1939-06-28 | 1941-03-11 | 0 | Details |
| US2234696A | Photoelectric cell | Expired / Lapsed | 1937-05-29 | 1941-03-11 | 0 | Details |
| US2233923A | Control device | Expired / Lapsed | 1939-09-26 | 1941-03-04 | 0 | Details |
| US2233169A | Control system | Expired / Lapsed | 1940-03-28 | 1941-02-25 | 0 | Details |
| US2233183A | Frequency modulation system | Expired / Lapsed | 1938-11-12 | 1941-02-25 | 0 | Details |
| US2233166A | Means for transferring high frequency power | Expired / Lapsed | 1938-11-01 | 1941-02-25 | 0 | Details |
| US2233165A | Automatic frequency control | Expired / Lapsed | 1938-06-30 | 1941-02-25 | 0 | Details |
| US2233198A | Automatic frequency control | Expired / Lapsed | 1938-06-30 | 1941-02-25 | 0 | Details |
| US2232535A | Waterproof telegraph key | Expired / Lapsed | 1940-07-23 | 1941-02-18 | 0 | Details |
| US2232545A | Stoker driving arrangement | Expired / Lapsed | 1939-11-16 | 1941-02-18 | 0 | Details |
| US2232541A | Electric valve circuit | Expired / Lapsed | 1938-03-31 | 1941-02-18 | 0 | Details |
| US2231603A | General purpose time switch | Expired / Lapsed | 1940-03-29 | 1941-02-11 | 0 | Details |
| US2231565A | Socket adapter | Expired / Lapsed | 1939-02-25 | 1941-02-11 | 0 | Details |
| US2231591A | Electric valve circuit | Expired / Lapsed | 1938-05-19 | 1941-02-11 | 0 | Details |
| US2230715A | Control system | Expired / Lapsed | 1940-03-14 | 1941-02-04 | 0 | Details |
| US2230864A | Control system | Expired / Lapsed | 1940-03-01 | 1941-02-04 | 0 | Details |
| US2230945A | Alternating current voltage regulator | Expired / Lapsed | 1938-11-04 | 1941-02-04 | 0 | Details |
| US2229964A | Television synchronizing system | Expired / Lapsed | 1938-10-26 | 1941-01-28 | 0 | Details |
| US2229982A | Nonmetallic gear wheel blank and method of making same | Expired / Lapsed | 1938-08-19 | 1941-01-28 | 0 | Details |
| US2229968A | Electric valve circuits | Expired / Lapsed | 1937-12-14 | 1941-01-28 | 0 | Details |
| US2229436A | Method of making metal-enclosed vacuum tubes | Expired / Lapsed | 1940-09-21 | 1941-01-21 | 0 | Details |
| US2229449A | Phase shifting circuit | Expired / Lapsed | 1937-12-14 | 1941-01-21 | 0 | Details |
| US2229448A | Electric control system | Expired / Lapsed | 1937-11-24 | 1941-01-21 | 0 | Details |
| US2228815A | Frequency conversion system | Expired / Lapsed | 1940-01-27 | 1941-01-14 | 0 | Details |
| US2228834A | Refrigerating system | Expired / Lapsed | 1940-01-13 | 1941-01-14 | 0 | Details |
| US2228816A | Apparatus for separating fluids | Expired / Lapsed | 1939-01-05 | 1941-01-14 | 0 | Details |
| US2228821A | Magnetic sweep coil circuit | Expired / Lapsed | 1938-10-01 | 1941-01-14 | 0 | Details |
| US2228844A | Electric valve circuits | Expired / Lapsed | 1938-08-06 | 1941-01-14 | 0 | Details |
| US2228843A | Electric valve circuit | Expired / Lapsed | 1937-12-14 | 1941-01-14 | 0 | Details |
| US2227967A | Mounting for electrical apparatus | Expired / Lapsed | 1940-03-29 | 1941-01-07 | 0 | Details |
| US2227993A | Mounting electrical apparatus | Expired / Lapsed | 1939-03-16 | 1941-01-07 | 0 | Details |
| US2226802A | Hydraulic coupling for vehicles | Expired / Lapsed | 1939-06-14 | 1940-12-31 | 0 | Details |
| US2227303A | Alarm and control mechanism | Expired / Lapsed | 1939-04-07 | 1940-12-31 | 0 | Details |
| US2226801A | Hydraulic gear of the fottinger type | Expired / Lapsed | 1938-04-05 | 1940-12-31 | 0 | Details |
| US2226275A | Magnetic thickness gauge | Expired / Lapsed | 1939-11-16 | 1940-12-24 | 0 | Details |
| US2226407A | Luminescent material | Expired / Lapsed | 1939-02-27 | 1940-12-24 | 0 | Details |
| US2226287A | Magnetic coupler | Expired / Lapsed | 1938-10-26 | 1940-12-24 | 0 | Details |
| US2226288A | System for amplification of direct voltages | Expired / Lapsed | 1937-05-26 | 1940-12-24 | 0 | Details |
| US2225346A | Phase angle indicator | Expired / Lapsed | 1939-08-19 | 1940-12-17 | 0 | Details |
| US2225330A | Electron beam tube | Expired / Lapsed | 1939-04-22 | 1940-12-17 | 0 | Details |
| US2225349A | Ventilating fan control | Expired / Lapsed | 1939-02-01 | 1940-12-17 | 0 | Details |
| US2225363A | Telemetering system | Expired / Lapsed | 1938-10-21 | 1940-12-17 | 0 | Details |
| US2225353A | Light measuring apparatus | Expired / Lapsed | 1938-05-26 | 1940-12-17 | 0 | Details |
| US2225338A | Immersion pump arrangement | Expired / Lapsed | 1938-04-26 | 1940-12-17 | 0 | Details |
| US2225348A | Phase measuring instrument | Expired / Lapsed | 1937-06-12 | 1940-12-17 | 0 | Details |
| US2224595A | Method for producing cutting tools | Expired / Lapsed | 1939-03-11 | 1940-12-10 | 0 | Details |
| US2223970A | Electric induction heating apparatus | Expired / Lapsed | 1939-04-29 | 1940-12-03 | 0 | Details |
| US2222718A | Joint for high tension cables | Expired / Lapsed | 1938-12-03 | 1940-11-26 | 0 | Details |
| US2222723A | Cable connector | Expired / Lapsed | 1938-11-04 | 1940-11-26 | 0 | Details |
| US2222901A | Ultra-short-wave device | Expired / Lapsed | 1938-06-01 | 1940-11-26 | 0 | Details |
| US2222696A | Protective system | Expired / Lapsed | 1938-06-01 | 1940-11-26 | 0 | Details |
| US2223231A | Connector plug | Expired / Lapsed | 1937-09-10 | 1940-11-26 | 0 | Details |
| US2222714A | Control circuit | Expired / Lapsed | 1937-06-03 | 1940-11-26 | 0 | Details |
| US2222729A | Resin-containing composite structure | Expired / Lapsed | 1936-12-05 | 1940-11-26 | 0 | Details |
| US2221517A | Electric valve circuits | Expired / Lapsed | 1938-12-07 | 1940-11-12 | 0 | Details |
| US2221671A | Gas dielectric media | Expired / Lapsed | 1938-07-09 | 1940-11-12 | 0 | Details |
| US2221516A | Continuous thickness gauge | Expired / Lapsed | 1937-04-01 | 1940-11-12 | 0 | Details |
| US2220862A | Low-reflectance glass | Expired / Lapsed | 1939-04-28 | 1940-11-05 | 0 | Details |
| US2220769A | Time delay control system | Expired / Lapsed | 1939-04-28 | 1940-11-05 | 0 | Details |
| US2220861A | Reduction of surface reflection | Expired / Lapsed | 1938-06-16 | 1940-11-05 | 0 | Details |
| US2220840A | Velocity modulation device | Expired / Lapsed | 1938-04-14 | 1940-11-05 | 0 | Details |
| US2220860A | Film structure and method of preparation | Expired / Lapsed | 1938-03-16 | 1940-11-05 | 0 | Details |
| US2220765A | Vitreous material | Expired / Lapsed | 1938-02-07 | 1940-11-05 | 0 | Details |
| US2220729A | Apparatus for the comminution and disposal of waste material | Expired / Lapsed | 1937-12-31 | 1940-11-05 | 0 | Details |
| US2220774A | Ceramic material | Expired / Lapsed | 1937-12-30 | 1940-11-05 | 0 | Details |
| US2220775A | Ceramic material | Expired / Lapsed | 1937-12-30 | 1940-11-05 | 0 | Details |
| US2220770A | Apparatus for controlling the apparent resistance of an amp… | Expired / Lapsed | 1937-01-30 | 1940-11-05 | 0 | Details |
| US2219939A | Bridge arrangement | Expired / Lapsed | 1939-03-01 | 1940-10-29 | 0 | Details |
| US2219891A | Exhausting and sealing method and apparatus | Expired / Lapsed | 1938-10-07 | 1940-10-29 | 0 | Details |
| US2219899A | Binder for making luminescent screens | Expired / Lapsed | 1938-04-06 | 1940-10-29 | 0 | Details |
| US2219200A | Electric valve converting system | Expired / Lapsed | 1939-06-07 | 1940-10-22 | 0 | Details |
| US2219195A | Electronic voltage regulator | Expired / Lapsed | 1939-03-29 | 1940-10-22 | 0 | Details |
| US2219186A | Magnetic latch | Expired / Lapsed | 1938-11-02 | 1940-10-22 | 0 | Details |
| US2219188A | Cathode ray oscillograph control circuits | Expired / Lapsed | 1938-09-21 | 1940-10-22 | 0 | Details |
| US2218390A | Control system | Expired / Lapsed | 1939-01-17 | 1940-10-15 | 0 | Details |
| US2218386A | Discharge device | Expired / Lapsed | 1938-06-17 | 1940-10-15 | 0 | Details |
| US2218385A | Method of making an insulated electrical conductor | Expired / Lapsed | 1936-02-18 | 1940-10-15 | 0 | Details |
| US2217104A | Temporary sealing means for gas filled cables | Expired / Lapsed | 1939-01-18 | 1940-10-08 | 0 | Details |
| US2217443A | Electric valve circuits | Expired / Lapsed | 1938-05-12 | 1940-10-08 | 0 | Details |
| US2217451A | Process of treating thermoplastic materials | Expired / Lapsed | 1938-03-01 | 1940-10-08 | 0 | Details |
| US2216598A | Time delay control circuit | Expired / Lapsed | 1938-01-20 | 1940-10-01 | 0 | Details |
| US2216220A | Luminous brick and construction comprising the same | Expired / Lapsed | 1937-08-25 | 1940-10-01 | 0 | Details |
| US2215777A | Amplitude-limiting amplifier | Expired / Lapsed | 1937-12-15 | 1940-09-24 | 0 | Details |
| US2215477A | Method of manufacturing wire | Expired / Lapsed | 1937-10-19 | 1940-09-24 | 0 | Details |
| US2216010A | High tension electric cable | Expired / Lapsed | 1937-06-09 | 1940-09-24 | 0 | Details |
| US2215999A | Selenium rectifier having an insulating layer | Expired / Lapsed | 1937-05-26 | 1940-09-24 | 0 | Details |
| US2215327A | Air conditioning system | Expired / Lapsed | 1937-12-09 | 1940-09-17 | 0 | Details |
| US2214876A | Method of fabricating electrolytic capacitor | Expired / Lapsed | 1936-04-14 | 1940-09-17 | 0 | Details |
| US2213890A | Electric snap switch | Expired / Lapsed | 1938-09-29 | 1940-09-03 | 0 | Details |
| US2212625A | Television antenna | Expired / Lapsed | 1939-02-23 | 1940-08-27 | 0 | Details |
| US2212879A | Electric discharge lamp | Expired / Lapsed | 1938-08-16 | 1940-08-27 | 0 | Details |
| US2212427A | Electric discharge lamp circuit | Expired / Lapsed | 1939-11-01 | 1940-08-20 | 0 | Details |
| US2211606A | Liquid level indicator | Expired / Lapsed | 1939-02-08 | 1940-08-13 | 0 | Details |
| US2211590A | Gaseous electric discharge lamp device | Expired / Lapsed | 1938-05-25 | 1940-08-13 | 0 | Details |
| US2210489A | Electrical device | Expired / Lapsed | 1939-06-26 | 1940-08-06 | 0 | Details |
| US2210412A | Motor control system | Expired / Lapsed | 1938-05-18 | 1940-08-06 | 0 | Details |
| US2210781A | Control circuit | Expired / Lapsed | 1937-06-08 | 1940-08-06 | 0 | Details |
| US2210761A | Cathode | Expired / Lapsed | 1936-10-07 | 1940-08-06 | 0 | Details |
| US2209814A | Electrical connector | Expired / Lapsed | 1940-02-06 | 1940-07-30 | 0 | Details |
| US2209826A | Protective system | Expired / Lapsed | 1939-02-25 | 1940-07-30 | 0 | Details |
| US2209823A | Fuse | Expired / Lapsed | 1937-12-07 | 1940-07-30 | 0 | Details |
| US2209928A | Electrically insulating composition | Expired / Lapsed | 1937-11-16 | 1940-07-30 | 0 | Details |
| US2209220A | Weft straightener | Expired / Lapsed | 1939-06-29 | 1940-07-23 | 0 | Details |
| US2208455A | Dry plate electrode system having a control electrode | Expired / Lapsed | 1939-11-13 | 1940-07-16 | 0 | Details |
| US2208110A | Automatic gain control circuit | Expired / Lapsed | 1938-05-14 | 1940-07-16 | 0 | Details |
| US2208447A | Apparatus for straightening woven material | Expired / Lapsed | 1938-04-22 | 1940-07-16 | 0 | Details |
| US2207174A | Electric discharge lamp | Expired / Lapsed | 1936-05-15 | 1940-07-09 | 0 | Details |
| US2206723A | Starting apparatus for internal combustion engines | Expired / Lapsed | 1938-11-19 | 1940-07-02 | 0 | Details |
| US2206715A | Temperature responsive apparatus | Expired / Lapsed | 1938-01-13 | 1940-07-02 | 0 | Details |
| US2206703A | Wire reinforced cord set | Expired / Lapsed | 1937-11-26 | 1940-07-02 | 0 | Details |
| US2206702A | Radio voting | Expired / Lapsed | 1936-02-27 | 1940-07-02 | 0 | Details |
| US2205308A | Electrical resistor | Expired / Lapsed | 1938-07-26 | 1940-06-18 | 0 | Details |
| US2204423A | Discharge device | Expired / Lapsed | 1938-06-30 | 1940-06-11 | 0 | Details |
| US2203224A | Electric switch | Expired / Lapsed | 1939-04-13 | 1940-06-04 | 0 | Details |
| US2203545A | Piezoelectric device | Expired / Lapsed | 1938-06-18 | 1940-06-04 | 0 | Details |
| US2202699A | Transmission apparatus | Expired / Lapsed | 1935-12-21 | 1940-05-28 | 0 | Details |
| US2201857A | Antenna | Expired / Lapsed | 1938-12-29 | 1940-05-21 | 0 | Details |
| US2201829A | Protective apparatus | Expired / Lapsed | 1938-12-07 | 1940-05-21 | 0 | Details |
| US2201881A | Rotary switch | Expired / Lapsed | 1938-10-07 | 1940-05-21 | 0 | Details |
| US2201049A | Glass fabrication process and mold | Expired / Lapsed | 1939-10-13 | 1940-05-14 | 0 | Details |
| US2200962A | Ultra short wave device | Expired / Lapsed | 1938-12-31 | 1940-05-14 | 0 | Details |
| US2200110A | Time switch | Expired / Lapsed | 1939-02-24 | 1940-05-07 | 0 | Details |
| US2199350A | Automatic volume control system | Expired / Lapsed | 1938-12-08 | 1940-04-30 | 0 | Details |
| US2199169A | Automatic gain control system | Expired / Lapsed | 1938-10-21 | 1940-04-30 | 0 | Details |
| US2199209A | Extrusion device | Expired / Lapsed | 1937-05-26 | 1940-04-30 | 0 | Details |
| US2198479A | Image reproduction | Expired / Lapsed | 1937-11-03 | 1940-04-23 | 0 | Details |
| US2198474A | Electric switch | Expired / Lapsed | 1937-06-09 | 1940-04-23 | 0 | Details |
| US2197562A | Molded glass article | Expired / Lapsed | 1937-12-21 | 1940-04-16 | 0 | Details |
| US2196820A | Arrangement for extinguishing electric arcs | Expired / Lapsed | 1939-03-07 | 1940-04-09 | 0 | Details |
| US2196893A | Weft straightening apparatus | Expired / Lapsed | 1938-08-27 | 1940-04-09 | 0 | Details |
| US2196830A | Photoelectric cell | Expired / Lapsed | 1937-05-29 | 1940-04-09 | 0 | Details |
| US2195996A | Electric control circuit | Expired / Lapsed | 1937-04-24 | 1940-04-02 | 0 | Details |
| US2196033A | Molding compound and molded article of manufacture | Expired / Lapsed | 1936-10-01 | 1940-04-02 | 0 | Details |
| US2195958A | Electrically heated blanket | Expired / Lapsed | 1936-09-04 | 1940-04-02 | 0 | Details |
| US2195121A | Electric valve circuits | Expired / Lapsed | 1938-12-17 | 1940-03-26 | 0 | Details |
| US2195233A | Electrical coil | Expired / Lapsed | 1938-07-08 | 1940-03-26 | 0 | Details |
| US2195254A | Insulating material containing mica | Expired / Lapsed | 1938-07-08 | 1940-03-26 | 0 | Details |
| US2194373A | Electric lamp and mounting therefor | Expired / Lapsed | 1937-05-19 | 1940-03-19 | 0 | Details |
| US2194310A | Signaling system and apparatus | Expired / Lapsed | 1935-08-08 | 1940-03-19 | 0 | Details |
| US2193634A | Capacitor motor control | Expired / Lapsed | 1938-10-21 | 1940-03-12 | 0 | Details |
| US2193640A | Glass-to-metal seal | Expired / Lapsed | 1938-05-21 | 1940-03-12 | 0 | Details |
| US2193361A | High frequency apparatus | Expired / Lapsed | 1936-04-09 | 1940-03-12 | 0 | Details |
| US2192744A | Sintered permanent magnet | Expired / Lapsed | 1939-05-24 | 1940-03-05 | 0 | Details |
| US2192047A | Discharge apparatus | Expired / Lapsed | 1939-02-02 | 1940-02-27 | 0 | Details |
| US2192033A | Rotary crane | Expired / Lapsed | 1938-06-22 | 1940-02-27 | 0 | Details |
| US2192056A | Hot wire lead stripper | Expired / Lapsed | 1937-06-26 | 1940-02-27 | 0 | Details |
| US2192061A | Carrier current system | Expired / Lapsed | 1935-12-19 | 1940-02-27 | 0 | Details |
| US2191351A | Combinations of a source of radiation with material adapted… | Expired / Lapsed | 1938-04-13 | 1940-02-20 | 0 | Details |
| US2190757A | Electric valve circuit | Expired / Lapsed | 1937-08-11 | 1940-02-20 | 0 | Details |
| US2190775A | Electric valve circuit | Expired / Lapsed | 1937-06-16 | 1940-02-20 | 0 | Details |
| US2190448A | Broad-band transformer for pushpull circuits | Expired / Lapsed | 1938-08-10 | 1940-02-13 | 0 | Details |
| US2190513A | High frequency circuits | Expired / Lapsed | 1936-03-24 | 1940-02-13 | 0 | Details |
| US2190528A | Electric projection device | Expired / Lapsed | 1936-03-13 | 1940-02-13 | 0 | Details |
| US2189576A | Dry plate rectifier and method of producing same | Expired / Lapsed | 1937-06-10 | 1940-02-06 | 0 | Details |
| US2189580A | Method of making a photoelectric cell | Expired / Lapsed | 1937-05-29 | 1940-02-06 | 0 | Details |
| US2188178A | Connector for sector conductor cables | Expired / Lapsed | 1938-09-16 | 1940-01-23 | 0 | Details |
| US2186825A | Amplifier muting circuit | Expired / Lapsed | 1938-04-23 | 1940-01-09 | 0 | Details |
| US2186826A | Eccentricity indicator | Expired / Lapsed | 1936-09-12 | 1940-01-09 | 0 | Details |
| US2185807A | Cathode ray tube | Expired / Lapsed | 1938-04-08 | 1940-01-02 | 0 | Details |
| US2184270A | Heating device | Expired / Lapsed | 1939-08-08 | 1939-12-26 | 0 | Details |
| US2184359A | Combined switch and plug receptacle | Expired / Lapsed | 1938-02-03 | 1939-12-26 | 0 | Details |
| US2184272A | Electrical winding | Expired / Lapsed | 1937-12-17 | 1939-12-26 | 0 | Details |
| US2185037A | Waste disposal apparatus | Expired / Lapsed | 1936-11-12 | 1939-12-26 | 0 | Details |
| US2182014A | Electrical converting system | Expired / Lapsed | 1937-07-22 | 1939-12-05 | 0 | Details |
| US2182691A | Condition control system | Expired / Lapsed | 1937-05-20 | 1939-12-05 | 0 | Details |
| US2181803A | Remote indicator | Expired / Lapsed | 1938-11-04 | 1939-11-28 | 0 | Details |
| US2181246A | Coffee maker | Expired / Lapsed | 1937-09-29 | 1939-11-28 | 0 | Details |
| US2181728A | Traffic analyzer | Expired / Lapsed | 1936-07-24 | 1939-11-28 | 0 | Details |
| US2180974A | Refrigerating machine | Expired / Lapsed | 1937-12-01 | 1939-11-21 | 0 | Details |
| US2180992A | Process for spinning together a metal and a ceramic article | Expired / Lapsed | 1937-08-24 | 1939-11-21 | 0 | Details |
| US2180154A | Geared driving arrangement | Expired / Lapsed | 1937-11-20 | 1939-11-14 | 0 | Details |
| US2179288A | Method of coating luminescent tubes | Expired / Lapsed | 1938-08-24 | 1939-11-07 | 0 | Details |
| US2179298A | Signal system | Expired / Lapsed | 1938-06-02 | 1939-11-07 | 0 | Details |
| US2179366A | Electric valve converting system | Expired / Lapsed | 1938-01-28 | 1939-11-07 | 0 | Details |
| US2179342A | Protective means for electric circuits | Expired / Lapsed | 1935-12-03 | 1939-11-07 | 0 | Details |
| US2177883A | Electric discharge apparatus | Expired / Lapsed | 1938-09-01 | 1939-10-31 | 0 | Details |
| US2178432A | Method of and apparatus for producing a variable alternatin… | Expired / Lapsed | 1938-08-12 | 1939-10-31 | 0 | Details |
| US2178445A | Refrigerating machine | Expired / Lapsed | 1938-01-05 | 1939-10-31 | 0 | Details |
| US2177691A | Luminescent or phosphorescent body and the process of manuf… | Expired / Lapsed | 1936-06-25 | 1939-10-31 | 0 | Details |
| US2177701A | Fluorescent screen | Expired / Lapsed | 1936-01-22 | 1939-10-31 | 0 | Details |
| US2177479A | Program device | Expired / Lapsed | 1938-06-07 | 1939-10-24 | 0 | Details |
| US2177509A | Terminal structure | Expired / Lapsed | 1937-04-28 | 1939-10-24 | 0 | Details |
| US2177217A | Vehicle head lamp | Expired / Lapsed | 1937-03-23 | 1939-10-24 | 0 | Details |
| US2177508A | Terminal structure | Expired / Lapsed | 1936-07-29 | 1939-10-24 | 0 | Details |
| US2176718A | Electric disconnecting device | Expired / Lapsed | 1936-12-12 | 1939-10-17 | 0 | Details |
| US2176742A | Apparatus responsive to frequency difference | Expired / Lapsed | 1936-07-24 | 1939-10-17 | 0 | Details |
| US2175877A | Liquid composition | Expired / Lapsed | 1936-09-30 | 1939-10-10 | 0 | Details |
| US2175345A | Electric gaseous discharge device | Expired / Lapsed | 1936-06-27 | 1939-10-10 | 0 | Details |
| US2175935A | Motor control | Expired / Lapsed | 1935-12-20 | 1939-10-10 | 0 | Details |
| US2175009A | Electric control circuit | Expired / Lapsed | 1938-03-05 | 1939-10-03 | 0 | Details |
| US2175027A | Exposure meter | Expired / Lapsed | 1937-10-23 | 1939-10-03 | 0 | Details |
| US2175032A | Single phase motor control | Expired / Lapsed | 1937-07-30 | 1939-10-03 | 0 | Details |
| US2175017A | Electric control circuit | Expired / Lapsed | 1937-07-24 | 1939-10-03 | 0 | Details |
| US2175016A | Method of producing selenium rectifiers or the like | Expired / Lapsed | 1937-06-03 | 1939-10-03 | 0 | Details |
| US2174380A | Method of making elastic fluid turbines | Expired / Lapsed | 1938-04-01 | 1939-09-26 | 0 | Details |
| US2172950A | Automatic switching equipment | Expired / Lapsed | 1939-03-22 | 1939-09-12 | 0 | Details |
| US2172171A | Production of bright copper | Expired / Lapsed | 1938-08-10 | 1939-09-05 | 0 | Details |
| US2171348A | Electric valve time delay relay | Expired / Lapsed | 1938-06-17 | 1939-08-29 | 0 | Details |
| US2171347A | Time delay relay | Expired / Lapsed | 1937-07-24 | 1939-08-29 | 0 | Details |
| US2170457A | Electric discharge apparatus | Expired / Lapsed | 1938-12-20 | 1939-08-22 | 0 | Details |
| US2170448A | Electric discharge apparatus | Expired / Lapsed | 1938-03-22 | 1939-08-22 | 0 | Details |
| US2170694A | Electromagnetic switch and system therefor | Expired / Lapsed | 1937-10-01 | 1939-08-22 | 0 | Details |
| US2169860A | Guard means for electric switches | Expired / Lapsed | 1937-02-12 | 1939-08-15 | 0 | Details |
| US2169866A | Electric control and indicating means | Expired / Lapsed | 1936-01-30 | 1939-08-15 | 0 | Details |
| US2169116A | Product meter | Expired / Lapsed | 1938-04-29 | 1939-08-08 | 0 | Details |
| US2169101A | Thermocouple wattmeter | Expired / Lapsed | 1938-04-29 | 1939-08-08 | 0 | Details |
| US2169093A | Electrical control system | Expired / Lapsed | 1937-01-02 | 1939-08-08 | 0 | Details |
| US2168154A | Transformer | Expired / Lapsed | 1938-03-16 | 1939-08-01 | 0 | Details |
| US2168166A | Heat exchange apparatus | Expired / Lapsed | 1938-01-22 | 1939-08-01 | 0 | Details |
| US2168149A | Telemetering | Expired / Lapsed | 1937-06-30 | 1939-08-01 | 0 | Details |
| US2167530A | System of dynamic braking | Expired / Lapsed | 1938-11-01 | 1939-07-25 | 0 | Details |
| US2167539A | Method of making flanged cylinders | Expired / Lapsed | 1937-12-28 | 1939-07-25 | 0 | Details |
| US2167536A | Submarine signaling | Expired / Lapsed | 1937-06-09 | 1939-07-25 | 0 | Details |
| US2167472A | Thermostatic control of electron discharge apparatus | Expired / Lapsed | 1936-11-18 | 1939-07-25 | 0 | Details |
| US2167471A | Gas reaction method | Expired / Lapsed | 1935-09-25 | 1939-07-25 | 0 | Details |
| US2167513A | Automatic totalizing system | Expired / Lapsed | 1935-03-26 | 1939-07-25 | 0 | Details |
| US2166309A | Electric valve circuit | Expired / Lapsed | 1937-04-24 | 1939-07-18 | 0 | Details |
| US2166833A | Synchronizing apparatus | Expired / Lapsed | 1937-02-26 | 1939-07-18 | 0 | Details |
| US2166805A | Control circuit | Expired / Lapsed | 1936-04-28 | 1939-07-18 | 0 | Details |
| US2166824A | High temperature pyrometer | Expired / Lapsed | 1936-01-14 | 1939-07-18 | 0 | Details |
| US2166791A | Refrigerator | Expired / Lapsed | 1935-06-28 | 1939-07-18 | 0 | Details |
| US2165992A | Dynamic balancing of rotating bodies | Expired / Lapsed | 1937-01-26 | 1939-07-11 | 0 | Details |
| US2163409A | Ceramic-to-metal seal | Expired / Lapsed | 1937-11-22 | 1939-06-20 | 0 | Details |
| US2163410A | Ceramic-to-metal seal | Expired / Lapsed | 1937-11-22 | 1939-06-20 | 0 | Details |
| US2163407A | Ceramic-to-metal seal | Expired / Lapsed | 1937-10-01 | 1939-06-20 | 0 | Details |
| US2163393A | Selenium rectifier having light metal carrier electrodes | Expired / Lapsed | 1937-06-08 | 1939-06-20 | 0 | Details |
| US2162589A | Temperature control device | Expired / Lapsed | 1937-10-30 | 1939-06-13 | 0 | Details |
| US2162586A | Refrigerant evaporator | Expired / Lapsed | 1937-06-12 | 1939-06-13 | 0 | Details |
| US2162545A | Electric fixture | Expired / Lapsed | 1936-01-14 | 1939-06-13 | 0 | Details |
| US2161604A | Washing machine | Expired / Lapsed | 1935-04-06 | 1939-06-06 | 0 | Details |
| US2160592A | Temperature regulating system | Expired / Lapsed | 1936-12-08 | 1939-05-30 | 0 | Details |
| US2159768A | High power factor induction motor | Expired / Lapsed | 1938-05-17 | 1939-05-23 | 0 | Details |
| US2159758A | Power plant | Expired / Lapsed | 1937-09-13 | 1939-05-23 | 0 | Details |
| US2158855A | Hydraulic press for cable connectors | Expired / Lapsed | 1938-08-10 | 1939-05-16 | 0 | Details |
| US2158850A | Temperature control device | Expired / Lapsed | 1937-11-30 | 1939-05-16 | 0 | Details |
| US2158853A | Image reproduction | Expired / Lapsed | 1937-10-30 | 1939-05-16 | 0 | Details |
| US2158885A | Electric valve circuit | Expired / Lapsed | 1937-04-24 | 1939-05-16 | 0 | Details |
| US2158851A | Socket | Expired / Lapsed | 1937-02-03 | 1939-05-16 | 0 | Details |
| US2157918A | Art of uniting metals | Expired / Lapsed | 1937-02-18 | 1939-05-09 | 0 | Details |
| US2157906A | Electric fuse | Expired / Lapsed | 1936-06-22 | 1939-05-09 | 0 | Details |
| US2157907A | Fuse | Expired / Lapsed | 1935-11-26 | 1939-05-09 | 0 | Details |
| US2155276A | Quenching chamber for electric gas switches | Expired / Lapsed | 1938-01-31 | 1939-04-18 | 0 | Details |
| US2155248A | Optical comparator | Expired / Lapsed | 1937-08-20 | 1939-04-18 | 0 | Details |
| US2155267A | Foil gauge | Expired / Lapsed | 1937-02-19 | 1939-04-18 | 0 | Details |
| US2155256A | Temperature regulating system | Expired / Lapsed | 1936-09-10 | 1939-04-18 | 0 | Details |
| US2155229A | Protective system | Expired / Lapsed | 1936-08-20 | 1939-04-18 | 0 | Details |
| US2155262A | Comfort responsive apparatus | Expired / Lapsed | 1935-11-08 | 1939-04-18 | 0 | Details |
| US2155255A | Temperature control system | Expired / Lapsed | 1935-09-21 | 1939-04-18 | 0 | Details |
| US2154217A | Method of fabricating hollow pads | Expired / Lapsed | 1937-04-08 | 1939-04-11 | 0 | Details |
| US2154216A | Cooling pad | Expired / Lapsed | 1936-06-24 | 1939-04-11 | 0 | Details |
| US2154314A | Motor control | Expired / Lapsed | 1935-12-20 | 1939-04-11 | 0 | Details |
| US2153363A | Laminated metal body | Expired / Lapsed | 1936-12-08 | 1939-04-04 | 0 | Details |
| US2151602A | X-ray apparatus | Expired / Lapsed | 1936-11-13 | 1939-03-21 | 0 | Details |
| US2151570A | Control system | Expired / Lapsed | 1936-02-27 | 1939-03-21 | 0 | Details |
| US2150776A | Traffic analyzer | Expired / Lapsed | 1935-03-14 | 1939-03-14 | 0 | Details |
| US2149092A | Saturable core detector | Expired / Lapsed | 1938-03-26 | 1939-02-28 | 0 | Details |
| US2149084A | Electric receptacle | Expired / Lapsed | 1936-05-22 | 1939-02-28 | 0 | Details |
| US2147482A | Luminaire | Expired / Lapsed | 1936-12-01 | 1939-02-14 | 0 | Details |
| US2147492A | Oscillation generator | Expired / Lapsed | 1935-10-17 | 1939-02-14 | 0 | Details |
| US2147495A | Ice tray | Expired / Lapsed | 1935-09-18 | 1939-02-14 | 0 | Details |
| US2146579A | Electric discharge lamp | Expired / Lapsed | 1936-04-22 | 1939-02-07 | 0 | Details |
| US2145117A | Speed-governing mechanism | Expired / Lapsed | 1937-08-31 | 1939-01-24 | 0 | Details |
| US2144541A | Equivalent capacitance network | Expired / Lapsed | 1936-10-22 | 1939-01-17 | 0 | Details |
| US2144596A | Hydraulic gear | Expired / Lapsed | 1935-09-18 | 1939-01-17 | 0 | Details |
| US2143723A | Method and apparatus for applying metal coatings | Expired / Lapsed | 1935-03-13 | 1939-01-10 | 0 | Details |
| US2142837A | Discharge lamp system | Expired / Lapsed | 1937-03-27 | 1939-01-03 | 0 | Details |
| US2142865A | Method of manufacturing filaments | Expired / Lapsed | 1937-03-24 | 1939-01-03 | 0 | Details |
| US2142854A | Viscosimeter | Expired / Lapsed | 1934-12-01 | 1939-01-03 | 0 | Details |
| US2141937A | Electric phase shifting circuits | Expired / Lapsed | 1936-08-12 | 1938-12-27 | 0 | Details |
| US2141923A | Ventilating apparatus | Expired / Lapsed | 1936-04-16 | 1938-12-27 | 0 | Details |
| US2141319A | Simplified structure for driving spinning blades | Expired / Lapsed | 1936-04-07 | 1938-12-27 | 0 | Details |
| US2141922A | Electric valve translating circuit | Expired / Lapsed | 1936-03-12 | 1938-12-27 | 0 | Details |
| US2141286A | Coupling-on or bridging implement | Expired / Lapsed | 1936-02-01 | 1938-12-27 | 0 | Details |
| US2141910A | Electric cable | Expired / Lapsed | 1935-03-19 | 1938-12-27 | 0 | Details |
| US2140380A | Rotary motion transmitting system | Expired / Lapsed | 1938-03-08 | 1938-12-13 | 0 | Details |
| US2140390A | Speed responsive means | Expired / Lapsed | 1936-06-17 | 1938-12-13 | 0 | Details |
| US2140376A | Electric panel board | Expired / Lapsed | 1936-06-06 | 1938-12-13 | 0 | Details |
| US2139509A | Recorder | Expired / Lapsed | 1936-09-12 | 1938-12-06 | 0 | Details |
| US2139489A | Frequency responsive relay | Expired / Lapsed | 1936-08-27 | 1938-12-06 | 0 | Details |
| US2138661A | Method of making dynamo-electric machines | Expired / Lapsed | 1937-04-01 | 1938-11-29 | 0 | Details |
| US2138668A | Telemetering system and apparatus | Expired / Lapsed | 1936-09-10 | 1938-11-29 | 0 | Details |
| US2138655A | Receiving system | Expired / Lapsed | 1935-06-21 | 1938-11-29 | 0 | Details |
| US2137859A | Frequency meter | Expired / Lapsed | 1937-09-29 | 1938-11-22 | 0 | Details |
| US2137831A | Method of producing dry plate elements for selenium rectifi… | Expired / Lapsed | 1937-05-26 | 1938-11-22 | 0 | Details |
| US2137846A | Measuring instrument for alternating current circuits | Expired / Lapsed | 1937-02-25 | 1938-11-22 | 0 | Details |
| US2137126A | Electric valve circuit | Expired / Lapsed | 1936-04-25 | 1938-11-15 | 0 | Details |
| US2137133A | Apparatus for integrating variable quantities | Expired / Lapsed | 1934-06-18 | 1938-11-15 | 0 | Details |
| US2135690A | Gaseous electric discharge lamp device | Expired / Lapsed | 1937-09-14 | 1938-11-08 | 0 | Details |
| US2136249A | Refrigerant evaporator | Expired / Lapsed | 1937-04-17 | 1938-11-08 | 0 | Details |
| US2136248A | Electrical regulation | Expired / Lapsed | 1937-01-30 | 1938-11-08 | 0 | Details |
| US2136256A | Furnace control system | Expired / Lapsed | 1935-12-18 | 1938-11-08 | 0 | Details |
| US2136268A | Vacuum cleaner | Expired / Lapsed | 1933-10-18 | 1938-11-08 | 0 | Details |
| US2135285A | Heat pump | Expired / Lapsed | 1938-01-15 | 1938-11-01 | 0 | Details |
| US2135295A | Supervisory control system | Expired / Lapsed | 1937-01-21 | 1938-11-01 | 0 | Details |
| US2135288A | Machine for making filament supporting structures | Expired / Lapsed | 1936-04-11 | 1938-11-01 | 0 | Details |
| US2135315A | Coil insulation | Expired / Lapsed | 1935-09-04 | 1938-11-01 | 0 | Details |
| US2134498A | Reversible thermostatic system | Expired / Lapsed | 1936-03-21 | 1938-10-25 | 0 | Details |
| US2134581A | Recording instrument | Expired / Lapsed | 1934-06-09 | 1938-10-25 | 0 | Details |
| US2133879A | Shaft packing | Expired / Lapsed | 1936-04-28 | 1938-10-18 | 0 | Details |
| US2133745A | Copper oxide rectifying element | Expired / Lapsed | 1935-11-19 | 1938-10-18 | 0 | Details |
| US2133872A | Selective control for air conditioning apparatus | Expired / Lapsed | 1935-07-23 | 1938-10-18 | 0 | Details |
| US2133849A | Means for tuning receiving systems | Expired / Lapsed | 1935-05-17 | 1938-10-18 | 0 | Details |
| US2133158A | Circuit breaker | Expired / Lapsed | 1936-12-17 | 1938-10-11 | 0 | Details |
| US2133141A | Vacuum cleaner | Expired / Lapsed | 1936-12-05 | 1938-10-11 | 0 | Details |
| US2133138A | Stroboscope | Expired / Lapsed | 1936-05-04 | 1938-10-11 | 0 | Details |
| US2132277A | Control system | Expired / Lapsed | 1937-02-12 | 1938-10-04 | 0 | Details |
| US2132256A | Dual-load meter | Expired / Lapsed | 1936-10-27 | 1938-10-04 | 0 | Details |
| US2131602A | Dynamically balancing rotatable body | Expired / Lapsed | 1936-06-17 | 1938-09-27 | 0 | Details |
| US2130879A | Method of making a vacuum-tight joint between solid bodies | Expired / Lapsed | 1937-03-24 | 1938-09-20 | 0 | Details |
| US2130429A | Electric valve circuits | Expired / Lapsed | 1936-01-30 | 1938-09-20 | 0 | Details |
| US2130272A | Piezoelectric crystal oscillator | Expired / Lapsed | 1938-03-31 | 1938-09-13 | 0 | Details |
| US2129529A | Elastic fluid turbine turning mechanism | Expired / Lapsed | 1938-02-17 | 1938-09-06 | 0 | Details |
| US2129524A | Current transformer | Expired / Lapsed | 1936-10-31 | 1938-09-06 | 0 | Details |
| US2128812A | Remote signaling system | Expired / Lapsed | 1936-10-16 | 1938-08-30 | 0 | Details |
| US2128791A | Means for adjusting reflectors | Expired / Lapsed | 1936-09-15 | 1938-08-30 | 0 | Details |
| US2128861A | Vapor electric discharge device | Expired / Lapsed | 1936-07-16 | 1938-08-30 | 0 | Details |
| US2128117A | Arc discharge apparatus | Expired / Lapsed | 1932-01-07 | 1938-08-23 | 0 | Details |
| US2127408A | Transmission line termination | Expired / Lapsed | 1935-09-13 | 1938-08-16 | 0 | Details |
| US2126559A | Soldering iron | Expired / Lapsed | 1934-03-30 | 1938-08-09 | 0 | Details |
| US2126285A | Refrigerator | Expired / Lapsed | 1930-12-10 | 1938-08-09 | 0 | Details |
| US2125765A | Remote control system | Expired / Lapsed | 1937-04-09 | 1938-08-02 | 0 | Details |
| US2125799A | Circuits for arc-back suppression | Expired / Lapsed | 1936-04-16 | 1938-08-02 | 0 | Details |
| US2125113A | Evacuated receptacle | Expired / Lapsed | 1936-06-17 | 1938-07-26 | 0 | Details |
| US2125110A | Protective means for fan cooled rectifiers and the like | Expired / Lapsed | 1936-03-10 | 1938-07-26 | 0 | Details |
| US2124410A | Relay apparatus | Expired / Lapsed | 1935-08-30 | 1938-07-19 | 0 | Details |
| US2124395A | Power plant | Expired / Lapsed | 1934-08-31 | 1938-07-19 | 0 | Details |
| US2122307A | Timer motor | Expired / Lapsed | 1937-09-08 | 1938-06-28 | 0 | Details |
| US2121625A | Heating and cooling system | Expired / Lapsed | 1936-11-17 | 1938-06-21 | 0 | Details |
| US2120488A | Reversible thermostatic control system | Expired / Lapsed | 1937-07-21 | 1938-06-14 | 0 | Details |
| US2120896A | Automatic power transmission for automotive vehicles | Expired / Lapsed | 1937-04-21 | 1938-06-14 | 0 | Details |
| US2120092A | Clutch | Expired / Lapsed | 1936-08-06 | 1938-06-07 | 0 | Details |
| US2120103A | Device mounting | Expired / Lapsed | 1934-12-28 | 1938-06-07 | 0 | Details |
| US2119393A | Electric cable and method of manufacturing the same | Expired / Lapsed | 1934-07-18 | 1938-05-31 | 0 | Details |
| US2117908A | Electric valve circuit | Expired / Lapsed | 1936-10-06 | 1938-05-17 | 0 | Details |
| US2118017A | Electrical insulation | Expired / Lapsed | 1936-03-07 | 1938-05-17 | 0 | Details |
| US2117131A | Supercharger arrangement | Expired / Lapsed | 1936-06-02 | 1938-05-10 | 0 | Details |
| US2116429A | Assembly for discharge devices | Expired / Lapsed | 1936-05-26 | 1938-05-03 | 0 | Details |
| US2115597A | Protection of electric systems | Expired / Lapsed | 1936-12-08 | 1938-04-26 | 0 | Details |
| US2115495A | Bushing | Expired / Lapsed | 1936-05-16 | 1938-04-26 | 0 | Details |
| US2115582A | Time delay undervoltage protective system | Expired / Lapsed | 1936-03-19 | 1938-04-26 | 0 | Details |
| US2114828A | Electric valve circuit | Expired / Lapsed | 1936-07-03 | 1938-04-19 | 0 | Details |
| US2114196A | Electric controller | Expired / Lapsed | 1937-08-17 | 1938-04-12 | 0 | Details |
| US2113090A | Luminescent material | Expired / Lapsed | 1937-06-03 | 1938-04-05 | 0 | Details |
| US2113398A | Fitting for fluid circulating systems | Expired / Lapsed | 1936-12-16 | 1938-04-05 | 0 | Details |
| US2112038A | Air conditioning system | Expired / Lapsed | 1936-05-05 | 1938-03-22 | 0 | Details |
| US2111423A | Speed regulation | Expired / Lapsed | 1936-04-08 | 1938-03-15 | 0 | Details |
| US2110693A | Air conditioning system | Expired / Lapsed | 1937-05-26 | 1938-03-08 | 0 | Details |
| US2110015A | Electric timing and counting device | Expired / Lapsed | 1932-03-09 | 1938-03-01 | 0 | Details |
| US2109368A | High voltage bushing | Expired / Lapsed | 1936-09-15 | 1938-02-22 | 0 | Details |
| US2108662A | Inductor dynamo-electric machine | Expired / Lapsed | — | 1938-02-15 | 0 | Details |
| US2107901A | Electrical insulation material | Expired / Lapsed | 1936-02-20 | 1938-02-08 | 0 | Details |
| US2107903A | Method of manufacturing an electric device | Expired / Lapsed | 1934-01-03 | 1938-02-08 | 0 | Details |
| US2107902A | Supervisory control system | Expired / Lapsed | 1933-09-12 | 1938-02-08 | 0 | Details |
| US2106581A | Electric switch | Expired / Lapsed | 1936-10-31 | 1938-01-25 | 0 | Details |
| US2106611A | Apparatus for correcting skew and bow in woven material | Expired / Lapsed | 1936-07-24 | 1938-01-25 | 0 | Details |
| US2106612A | Straightener for woven material | Expired / Lapsed | 1935-08-06 | 1938-01-25 | 0 | Details |
| US2106040A | Blower rotor for very high peripheral velocity | Expired / Lapsed | 1937-01-11 | 1938-01-18 | 0 | Details |
| US2105513A | Directional self-starting inductor motor | Expired / Lapsed | 1936-07-22 | 1938-01-18 | 0 | Details |
| US2105514A | Self-reversing motor drive | Expired / Lapsed | 1936-07-22 | 1938-01-18 | 0 | Details |
| US2106061A | Electric switch gear | Expired / Lapsed | 1936-03-12 | 1938-01-18 | 0 | Details |
| US2106039A | Condenser dielectric material | Expired / Lapsed | 1935-12-12 | 1938-01-18 | 0 | Details |
| US2105364A | Resinous thermoplastic materials | Expired / Lapsed | 1936-04-27 | 1938-01-11 | 0 | Details |
| US2105430A | Electric lamp | Expired / Lapsed | 1929-09-18 | 1938-01-11 | 0 | Details |
| US2104652A | Electric discharge device | Expired / Lapsed | 1936-01-25 | 1938-01-04 | 0 | Details |
| US2103907A | Time switch | Expired / Lapsed | 1937-05-15 | 1937-12-28 | 0 | Details |
| US2103085A | Electric lamp | Expired / Lapsed | 1937-07-16 | 1937-12-21 | 0 | Details |
| US2103028A | Electric conduction device | Expired / Lapsed | 1935-05-22 | 1937-12-21 | 0 | Details |
| US2102664A | Control system | Expired / Lapsed | 1935-01-16 | 1937-12-21 | 0 | Details |
| US2103078A | Gaseous electric discharge lamp | Expired / Lapsed | 1934-10-30 | 1937-12-21 | 0 | Details |
| US2102421A | Cathode ray oscillograph | Expired / Lapsed | 1934-07-12 | 1937-12-14 | 0 | Details |
| US2101671A | Magnetic clutch | Expired / Lapsed | 1936-05-05 | 1937-12-07 | 0 | Details |
| US2101656A | Refrigerating machine | Expired / Lapsed | 1935-01-22 | 1937-12-07 | 0 | Details |
| US2100833A | Damping device for indicating instruments | Expired / Lapsed | 1936-02-17 | 1937-11-30 | 0 | Details |
| US2100653A | Control system | Expired / Lapsed | 1935-09-27 | 1937-11-30 | 0 | Details |
| US2098051A | Oscillator control | Expired / Lapsed | 1936-03-16 | 1937-11-02 | 0 | Details |
| US2098080A | Incandescent lamp and the like | Expired / Lapsed | 1936-01-02 | 1937-11-02 | 0 | Details |
| US2098074A | Locomotive turbine drive | Expired / Lapsed | 1935-09-21 | 1937-11-02 | 0 | Details |
| US2098070A | Electromagnetic relay | Expired / Lapsed | 1935-05-29 | 1937-11-02 | 0 | Details |
| US2095263A | Butterfly valve | Expired / Lapsed | 1936-04-25 | 1937-10-12 | 0 | Details |
| US2095828A | Safety diaphragm | Expired / Lapsed | 1936-04-16 | 1937-10-12 | 0 | Details |
| US2094680A | Gaseous electric discharge device | Expired / Lapsed | 1936-12-31 | 1937-10-05 | 0 | Details |
| US2094647A | Gaseous electric discharge device | Expired / Lapsed | 1936-05-29 | 1937-10-05 | 0 | Details |
| US2095124A | Electric translating circuit | Expired / Lapsed | 1931-12-30 | 1937-10-05 | 0 | Details |
| US2094483A | Art of uniting metals | Expired / Lapsed | 1937-04-27 | 1937-09-28 | 0 | Details |
| US2094472A | Graphical analyzer | Expired / Lapsed | 1935-05-10 | 1937-09-28 | 0 | Details |
| US2093883A | Electric valve circuit | Expired / Lapsed | 1935-11-08 | 1937-09-21 | 0 | Details |
| US2093331A | Oscillation generator | Expired / Lapsed | 1935-08-01 | 1937-09-14 | 0 | Details |
| US2093316A | Coffee maker | Expired / Lapsed | 1935-05-01 | 1937-09-14 | 0 | Details |
| US2091852A | Construction for joining metallic and nonmetallic members | Expired / Lapsed | 1936-01-02 | 1937-08-31 | 0 | Details |
| US2091152A | Oscillograph | Expired / Lapsed | 1936-06-17 | 1937-08-24 | 0 | Details |
| US2090526A | Circuit controlling device | Expired / Lapsed | 1936-04-03 | 1937-08-17 | 0 | Details |
| US2090522A | Electrical control device | Expired / Lapsed | 1935-03-07 | 1937-08-17 | 0 | Details |
| US2089695A | Oscillation generator | Expired / Lapsed | 1936-03-11 | 1937-08-10 | 0 | Details |
| US2089066A | Vibration absorbing mounting | Expired / Lapsed | 1935-11-21 | 1937-08-03 | 0 | Details |
| US2088409A | Electric translating circuits | Expired / Lapsed | 1935-02-26 | 1937-07-27 | 0 | Details |
| US2087735A | Gaseous electric discharge lamp device | Expired / Lapsed | 1936-10-06 | 1937-07-20 | 0 | Details |
| US2085995A | Insulated electrical conductor and process of making same | Expired / Lapsed | 1935-04-23 | 1937-07-06 | 0 | Details |
| US2085549A | Electric control device | Expired / Lapsed | 1935-10-17 | 1937-06-29 | 0 | Details |
| US2085587A | Method of brazing | Expired / Lapsed | 1935-05-29 | 1937-06-29 | 0 | Details |
| US2085584A | Apparatus for producing a gas atmosphere | Expired / Lapsed | 1934-04-11 | 1937-06-29 | 0 | Details |
| US2084880A | Control apparatus for heating systems | Expired / Lapsed | 1935-11-19 | 1937-06-22 | 0 | Details |
| US2084899A | System of electrical distribution | Expired / Lapsed | 1935-10-10 | 1937-06-22 | 0 | Details |
| US2084870A | System of electrical distribution | Expired / Lapsed | 1935-10-10 | 1937-06-22 | 0 | Details |
| US2084294A | Check valve | Expired / Lapsed | 1934-11-15 | 1937-06-15 | 0 | Details |
| US2083474A | High frequency receiving apparatus | Expired / Lapsed | 1934-07-25 | 1937-06-08 | 0 | Details |
| US2082607A | Electrical control system | Expired / Lapsed | 1936-05-27 | 1937-06-01 | 0 | Details |
| US2082644A | Electric valve translating circuit | Expired / Lapsed | 1936-01-02 | 1937-06-01 | 0 | Details |
| US2081780A | Electric control circuits | Expired / Lapsed | 1936-05-27 | 1937-05-25 | 0 | Details |
| US2081839A | High-voltage current-responsive apparatus | Expired / Lapsed | 1935-11-13 | 1937-05-25 | 0 | Details |
| US2080902A | Gaseous electric discharge metal vapor lamp device | Expired / Lapsed | 1934-09-18 | 1937-05-18 | 0 | Details |
| US2080926A | Light sensitive device | Expired / Lapsed | 1931-05-20 | 1937-05-18 | 0 | Details |
| US2081047A | Clamp | Expired / Lapsed | 1929-12-10 | 1937-05-18 | 0 | Details |
| US2080226A | Electric switch gear | Expired / Lapsed | 1936-01-24 | 1937-05-11 | 0 | Details |
| US2080250A | Electric valve circuit | Expired / Lapsed | 1930-09-29 | 1937-05-11 | 0 | Details |
| US2079485A | Protective arrangement for electrical instruments | Expired / Lapsed | 1934-10-23 | 1937-05-04 | 0 | Details |
| US2079466A | Electrical control system | Expired / Lapsed | 1934-07-20 | 1937-05-04 | 0 | Details |
| US2079477A | Photoelectric tube | Expired / Lapsed | 1931-11-27 | 1937-05-04 | 0 | Details |
| US2078800A | Paper break detector | Expired / Lapsed | 1936-12-03 | 1937-04-27 | 0 | Details |
| US2078781A | Time switch | Expired / Lapsed | 1936-02-05 | 1937-04-27 | 0 | Details |
| US2078796A | Vibration meter | Expired / Lapsed | 1934-11-01 | 1937-04-27 | 0 | Details |
| US2078792A | Electric timing and counting device | Expired / Lapsed | 1933-07-11 | 1937-04-27 | 0 | Details |
| US2077242A | Record chart quantity indication | Expired / Lapsed | 1933-11-23 | 1937-04-13 | 0 | Details |
| US2077239A | Hard metal alloy | Expired / Lapsed | 1932-10-19 | 1937-04-13 | 0 | Details |
| US2076278A | Electric discharge device | Expired / Lapsed | 1935-09-07 | 1937-04-06 | 0 | Details |
| US2076368A | High frequency power supply system | Expired / Lapsed | 1935-05-03 | 1937-04-06 | 0 | Details |
| US2074947A | Regulating system | Expired / Lapsed | 1936-09-17 | 1937-03-23 | 0 | Details |
| US2074126A | Frequency regulating system | Expired / Lapsed | 1935-07-12 | 1937-03-16 | 0 | Details |
| US2074136A | Resilient mounting | Expired / Lapsed | 1934-05-25 | 1937-03-16 | 0 | Details |
| US2073531A | Mercury vapor detector | Expired / Lapsed | 1935-10-01 | 1937-03-09 | 0 | Details |
| US2071173A | Timer | Expired / Lapsed | 1936-05-13 | 1937-02-16 | 0 | Details |
| US2071176A | Machine tool control arrangement | Expired / Lapsed | 1936-01-28 | 1937-02-16 | 0 | Details |
| US2071192A | Apparatus for recording or reproducing sound | Expired / Lapsed | 1935-08-01 | 1937-02-16 | 0 | Details |
| US2071184A | Indicating system | Expired / Lapsed | 1929-01-26 | 1937-02-16 | 0 | Details |
| US2070462A | Parallel operation of thyratrons | Expired / Lapsed | 1935-01-17 | 1937-02-09 | 0 | Details |
| US2070446A | Thyratron inverter stabilizer | Expired / Lapsed | 1934-09-29 | 1937-02-09 | 0 | Details |
| US2069633A | Frequency determining unit for piezoelectric crystal contro… | Expired / Lapsed | 1935-10-25 | 1937-02-02 | 0 | Details |
| US2069087A | Apparatus for the manufacture of insulated wire | Expired / Lapsed | 1933-11-28 | 1937-01-26 | 0 | Details |
| US2068559A | Single-phase multispeed motor control | Expired / Lapsed | 1936-05-29 | 1937-01-19 | 0 | Details |
| US2068577A | Compensating circuit | Expired / Lapsed | 1935-11-20 | 1937-01-19 | 0 | Details |
| US2068574A | Rotary kiln control arrangement | Expired / Lapsed | 1934-12-12 | 1937-01-19 | 0 | Details |
| US2068575A | Phase unbalance meter | Expired / Lapsed | 1934-10-17 | 1937-01-19 | 0 | Details |
| US2068557A | Rectifier | Expired / Lapsed | 1934-05-16 | 1937-01-19 | 0 | Details |
| US2067797A | Circuit breaker | Expired / Lapsed | 1936-05-06 | 1937-01-12 | 0 | Details |
| US2066949A | Craft navigating apparatus | Expired / Lapsed | 1936-05-16 | 1937-01-05 | 0 | Details |
| US2065369A | Radio transmitting system | Expired / Lapsed | 1935-03-20 | 1936-12-22 | 0 | Details |
| US2064632A | Electromagnetic switch | Expired / Lapsed | 1935-09-26 | 1936-12-15 | 0 | Details |
| US2064651A | Humidity responsive device | Expired / Lapsed | 1931-12-30 | 1936-12-15 | 0 | Details |
| US2063641A | Antenna | Expired / Lapsed | 1935-09-07 | 1936-12-08 | 0 | Details |
| US2063682A | Machine mounting | Expired / Lapsed | 1935-06-15 | 1936-12-08 | 0 | Details |
| US2061410A | Telemetering and position-signaling device and system | Expired / Lapsed | 1933-08-08 | 1936-11-17 | 0 | Details |
| US2060672A | Control system | Expired / Lapsed | 1935-01-28 | 1936-11-10 | 0 | Details |
| US2060663A | Processing graphite | Expired / Lapsed | 1934-03-17 | 1936-11-10 | 0 | Details |
| US2060665A | Resinous compositions | Expired / Lapsed | 1933-10-28 | 1936-11-10 | 0 | Details |
| US2059879A | Recording device | Expired / Lapsed | 1934-12-01 | 1936-11-03 | 0 | Details |
| US2059836A | Automatic reclosing circuit breaker system | Expired / Lapsed | 1934-09-20 | 1936-11-03 | 0 | Details |
| US2059896A | Supervisory control system | Expired / Lapsed | 1932-07-08 | 1936-11-03 | 0 | Details |
| US2059867A | Method of securing a metal member to a nonmetallic tubular … | Expired / Lapsed | 1932-06-22 | 1936-11-03 | 0 | Details |
| US2059870A | Protective means for radio receiving apparatus | Expired / Lapsed | 1930-10-07 | 1936-11-03 | 0 | Details |
| US2059004A | Cathode ray oscillograph sweep circuit | Expired / Lapsed | 1935-09-21 | 1936-10-27 | 0 | Details |
| US2058946A | Electrical compression or tension gauge | Expired / Lapsed | 1931-07-30 | 1936-10-27 | 0 | Details |
| US2058362A | Laminated core for electrical apparatus | Expired / Lapsed | 1936-03-28 | 1936-10-20 | 0 | Details |
| US2057531A | Electric indicating system | Expired / Lapsed | 1932-12-23 | 1936-10-13 | 0 | Details |
| US2057585A | Electric translating circuit | Expired / Lapsed | 1932-07-13 | 1936-10-13 | 0 | Details |
| US2057541A | Supervisory control system | Expired / Lapsed | 1930-11-18 | 1936-10-13 | 0 | Details |
| US2056348A | Control system | Expired / Lapsed | 1935-12-21 | 1936-10-06 | 0 | Details |
| US2056633A | Electric lamp unit | Expired / Lapsed | 1935-03-05 | 1936-10-06 | 0 | Details |
| US2056665A | Vapor electric discharge device | Expired / Lapsed | 1934-08-18 | 1936-10-06 | 0 | Details |
| US2056040A | Control system | Expired / Lapsed | 1935-01-30 | 1936-09-29 | 0 | Details |
| US2056050A | Automatic change speed gearing | Expired / Lapsed | 1934-10-11 | 1936-09-29 | 0 | Details |
| US2054672A | Flux meter | Expired / Lapsed | 1934-09-28 | 1936-09-15 | 0 | Details |
| US2053162A | Core for dynamo-electric machines | Expired / Lapsed | 1936-02-18 | 1936-09-01 | 0 | Details |
| US2053135A | Fabricated slab | Expired / Lapsed | 1935-10-25 | 1936-09-01 | 0 | Details |
| US2052701A | Dial mechanism | Expired / Lapsed | 1935-07-16 | 1936-09-01 | 0 | Details |
| US2053156A | Selector relay system | Expired / Lapsed | 1933-12-30 | 1936-09-01 | 0 | Details |
| US2053110A | Signaling system and apparatus | Expired / Lapsed | 1932-10-21 | 1936-09-01 | 0 | Details |
| US2052255A | Control system | Expired / Lapsed | 1932-07-21 | 1936-08-25 | 0 | Details |
| US2052380A | Welding machine | Expired / Lapsed | 1932-06-25 | 1936-08-25 | 0 | Details |
| US2052263A | Control system | Expired / Lapsed | 1932-01-29 | 1936-08-25 | 0 | Details |
| US2051018A | Speed ratio indicating device | Expired / Lapsed | 1934-03-28 | 1936-08-11 | 0 | Details |
| US2050873A | Method of and means for making cable sheaths | Expired / Lapsed | 1932-08-26 | 1936-08-11 | 0 | Details |
| US2049306A | Method and apparatus for testing filament wire | Expired / Lapsed | 1935-01-24 | 1936-07-28 | 0 | Details |
| US2049376A | Electrical amplifying circuit | Expired / Lapsed | 1932-12-06 | 1936-07-28 | 0 | Details |
| US2047665A | Electric counting apparatus | Expired / Lapsed | 1932-12-08 | 1936-07-14 | 0 | Details |
| US2046969A | Method of resistance spot welding | Expired / Lapsed | 1935-12-31 | 1936-07-07 | 0 | Details |
| US2046941A | Gaseous electric discharge device | Expired / Lapsed | 1935-10-15 | 1936-07-07 | 0 | Details |
| US2046965A | Vertical shaft motor | Expired / Lapsed | 1935-07-17 | 1936-07-07 | 0 | Details |
| US2047023A | Base for incandescent lamps and similar devices | Expired / Lapsed | 1932-12-24 | 1936-07-07 | 0 | Details |
| US2045496A | Vacuum cleaner | Expired / Lapsed | 1934-09-27 | 1936-06-23 | 0 | Details |
| US2044618A | Electrostatically controlled arc discharge device | Expired / Lapsed | 1933-12-29 | 1936-06-16 | 0 | Details |
| US2043917A | Evaporator for refrigerating machines | Expired / Lapsed | 1934-11-01 | 1936-06-09 | 0 | Details |
| US2043196A | Electric heater | Expired / Lapsed | 1935-09-17 | 1936-06-02 | 0 | Details |
| US2043044A | Electric cable | Expired / Lapsed | 1935-03-05 | 1936-06-02 | 0 | Details |
| US2042496A | Multistage rotary compressor | Expired / Lapsed | 1935-02-12 | 1936-06-02 | 0 | Details |
| US2042533A | Rotary pump, blower, or compressor and the like | Expired / Lapsed | 1934-06-21 | 1936-06-02 | 0 | Details |
| US2042542A | Electric current rectifier | Expired / Lapsed | 1934-04-12 | 1936-06-02 | 0 | Details |
| US2043020A | Pipe welding apparatus | Expired / Lapsed | 1933-12-12 | 1936-06-02 | 0 | Details |
| US2040677A | Pulsation apparatus | Expired / Lapsed | 1933-09-12 | 1936-05-12 | 0 | Details |
| US2039043A | Electric regulating system | Expired / Lapsed | 1933-07-01 | 1936-04-28 | 0 | Details |
| US2037565A | Control system | Expired / Lapsed | 1934-05-11 | 1936-04-14 | 0 | Details |
| US2037535A | Vacuum apparatus | Expired / Lapsed | 1933-09-27 | 1936-04-14 | 0 | Details |
| US2036781A | Cabinet door | Expired / Lapsed | 1934-06-14 | 1936-04-07 | 0 | Details |
| US2035728A | Water supply and distribution means for a humidifier | Expired / Lapsed | 1934-07-13 | 1936-03-31 | 0 | Details |
| US2036084A | Coupling | Expired / Lapsed | 1933-12-20 | 1936-03-31 | 0 | Details |
| US2035726A | Elastic fluid power plant | Expired / Lapsed | 1933-08-31 | 1936-03-31 | 0 | Details |
| US2034145A | Operating mechanism | Expired / Lapsed | 1933-10-19 | 1936-03-17 | 0 | Details |
| US2034571A | Electrical discharge device and method of operating same | Expired / Lapsed | 1933-08-16 | 1936-03-17 | 0 | Details |
| US2032620A | Electron discharge apparatus | Expired / Lapsed | 1930-09-02 | 1936-03-03 | 0 | Details |
| US2032260A | Wire feeding apparatus | Expired / Lapsed | 1934-12-18 | 1936-02-25 | 0 | Details |
| US2032294A | Electric heating pad | Expired / Lapsed | 1933-10-11 | 1936-02-25 | 0 | Details |
| US2031509A | Electric control means | Expired / Lapsed | 1934-01-25 | 1936-02-18 | 0 | Details |
| US2031480A | Ballast resistance | Expired / Lapsed | 1933-11-28 | 1936-02-18 | 0 | Details |
| US2030805A | Gaseous electric discharge lamp | Expired / Lapsed | 1935-03-25 | 1936-02-11 | 0 | Details |
| US2030440A | Manufacture of fabricated glass articles | Expired / Lapsed | 1934-12-20 | 1936-02-11 | 0 | Details |
| US2030390A | Glass | Expired / Lapsed | 1934-08-11 | 1936-02-11 | 0 | Details |
| US2027864A | Phase-sequence indicator | Expired / Lapsed | 1934-10-25 | 1936-01-14 | 0 | Details |
| US2027140A | Torque amplifying system | Expired / Lapsed | 1932-11-02 | 1936-01-07 | 0 | Details |
| US2026421A | Frequency responsive apparatus | Expired / Lapsed | 1934-01-23 | 1935-12-31 | 0 | Details |
| US2026423A | Constant temperature device | Expired / Lapsed | 1933-09-27 | 1935-12-31 | 0 | Details |
| US2024979A | Cathode ray apparatus | Expired / Lapsed | 1934-03-23 | 1935-12-17 | 0 | Details |
| US2024173A | Electric translating circuit | Expired / Lapsed | 1932-10-22 | 1935-12-17 | 0 | Details |
| US2023285A | Heat treating | Expired / Lapsed | 1934-08-30 | 1935-12-03 | 0 | Details |
| US2023243A | Control system | Expired / Lapsed | 1933-06-08 | 1935-12-03 | 0 | Details |
| US2022523A | Air conditioning apparatus | Expired / Lapsed | 1934-07-27 | 1935-11-26 | 0 | Details |
| US2022519A | Method of making electric heating pads | Expired / Lapsed | 1933-01-26 | 1935-11-26 | 0 | Details |
| US2021766A | Electronic timer | Expired / Lapsed | 1934-06-28 | 1935-11-19 | 0 | Details |
| US2021752A | Electric-circuit resistance-sensitive apparatus | Expired / Lapsed | 1932-05-26 | 1935-11-19 | 0 | Details |
| US2021753A | Electric circuit control means | Expired / Lapsed | 1932-05-26 | 1935-11-19 | 0 | Details |
| US2020972A | Protective arrangement for electric systems | Expired / Lapsed | 1933-10-19 | 1935-11-12 | 0 | Details |
| US2021062A | Indicator for incandescent lamps | Expired / Lapsed | 1932-12-09 | 1935-11-12 | 0 | Details |
| US2021034A | Glow discharge relay | Expired / Lapsed | 1931-12-07 | 1935-11-12 | 0 | Details |
| US2019351A | Air conditioning apparatus | Expired / Lapsed | 1934-11-17 | 1935-10-29 | 0 | Details |
| US2019352A | Electrical control circuits | Expired / Lapsed | 1934-03-29 | 1935-10-29 | 0 | Details |
| US2019335A | Diversity reception system | Expired / Lapsed | 1932-01-30 | 1935-10-29 | 0 | Details |
| US2019349A | Synthetic resin | Expired / Lapsed | 1930-05-12 | 1935-10-29 | 0 | Details |
| US2017703A | Integrating meter | Expired / Lapsed | 1934-09-15 | 1935-10-15 | 0 | Details |
| US2017712A | Frequency determining means | Expired / Lapsed | 1934-03-24 | 1935-10-15 | 0 | Details |
| US2016894A | Temperature compensation device | Expired / Lapsed | 1932-10-22 | 1935-10-08 | 0 | Details |
| US2016977A | Direction responsive system | Expired / Lapsed | 1931-12-01 | 1935-10-08 | 0 | Details |
| US2016147A | Electric valve tripping circuit | Expired / Lapsed | 1934-07-21 | 1935-10-01 | 0 | Details |
| US2016148A | Control system | Expired / Lapsed | 1931-08-12 | 1935-10-01 | 0 | Details |
| US2015570A | Cathode ray photographic apparatus | Expired / Lapsed | 1930-12-01 | 1935-09-24 | 0 | Details |
| US2014226A | Combined electrode holder and nozzle for gas-arc torches | Expired / Lapsed | 1934-12-28 | 1935-09-10 | 0 | Details |
| US2012825A | Production of large crystal metal bodies | Expired / Lapsed | 1932-02-06 | 1935-08-27 | 0 | Details |
| US2012821A | Automatic control of artificial illumination | Expired / Lapsed | 1931-10-29 | 1935-08-27 | 0 | Details |
| US2010879A | Gaseous electric discharge device | Expired / Lapsed | 1935-04-15 | 1935-08-13 | 0 | Details |
| US2011361A | Automatic reclosing circuit breaker system | Expired / Lapsed | 1934-03-31 | 1935-08-13 | 0 | Details |
| US2011420A | Gas turbine power plant | Expired / Lapsed | 1933-06-14 | 1935-08-13 | 0 | Details |
| US2011381A | Electrical system providing sequence operation | Expired / Lapsed | 1931-12-23 | 1935-08-13 | 0 | Details |
| US2011392A | Airplane altitude indicating system | Expired / Lapsed | 1928-08-10 | 1935-08-13 | 0 | Details |
| US2010714A | Circuit breaker | Expired / Lapsed | 1934-12-28 | 1935-08-06 | 0 | Details |
| US2010711A | Composite material and method of manufacturing the same | Expired / Lapsed | 1933-08-09 | 1935-08-06 | 0 | Details |
| US2010610A | Coding apparatus | Expired / Lapsed | 1933-03-01 | 1935-08-06 | 0 | Details |
| US2010614A | Electric pulsating apparatus | Expired / Lapsed | 1931-12-23 | 1935-08-06 | 0 | Details |
| US2010712A | Cathode ray tube | Expired / Lapsed | 1930-09-23 | 1935-08-06 | 0 | Details |
| US2009097A | Synchronizing apparatus | Expired / Lapsed | 1934-05-26 | 1935-07-23 | 0 | Details |
| US2008528A | Boiler | Expired / Lapsed | 1933-09-30 | 1935-07-16 | 0 | Details |
| US2008545A | Electrical oscillation circuits | Expired / Lapsed | 1932-07-08 | 1935-07-16 | 0 | Details |
| US2007777A | Control mechanism for furnace blowers | Expired / Lapsed | 1933-02-17 | 1935-07-09 | 0 | Details |
| US2007751A | Automatic arc welding | Expired / Lapsed | 1931-08-27 | 1935-07-09 | 0 | Details |
| US2007801A | Method of and means for regulating traffic | Expired / Lapsed | 1931-03-23 | 1935-07-09 | 0 | Details |
| US2007010A | Portable vibration indicator | Expired / Lapsed | 1934-02-01 | 1935-07-02 | 0 | Details |
| US2004787A | Mandrel | Expired / Lapsed | 1934-12-01 | 1935-06-11 | 0 | Details |
| US2004564A | Gaseous electric discharge lamp device | Expired / Lapsed | 1934-05-25 | 1935-06-11 | 0 | Details |
| US2004777A | Elastic fluid turbine | Expired / Lapsed | 1934-02-01 | 1935-06-11 | 0 | Details |
| US2003992A | Time delay circuit controlling apparatus | Expired / Lapsed | 1934-06-08 | 1935-06-04 | 0 | Details |
| US2004004A | Weatherproof armored cable | Expired / Lapsed | 1933-04-01 | 1935-06-04 | 0 | Details |
| US2003175A | Electric heater | Expired / Lapsed | 1933-08-12 | 1935-05-28 | 0 | Details |
| US2003167A | Apparatus for fusing powdered materials | Expired / Lapsed | 1931-01-09 | 1935-05-28 | 0 | Details |
| US2002372A | Vibration velocity measuring device | Expired / Lapsed | 1933-08-23 | 1935-05-21 | 0 | Details |
| US2002444A | Refrigerator evaporator | Expired / Lapsed | 1929-08-28 | 1935-05-21 | 0 | Details |
| US2001498A | Electric translating device | Expired / Lapsed | 1934-12-07 | 1935-05-14 | 0 | Details |
| US2001567A | Electric valve translating circuit | Expired / Lapsed | 1933-12-22 | 1935-05-14 | 0 | Details |
| US2000762A | Fluid jet pump | Expired / Lapsed | 1933-10-26 | 1935-05-07 | 0 | Details |
| US2000721A | Centrifugal compressor | Expired / Lapsed | 1932-10-26 | 1935-05-07 | 0 | Details |
| US2000803A | Electroresponsive device | Expired / Lapsed | 1932-06-11 | 1935-05-07 | 0 | Details |
| US2000713A | Clutch | Expired / Lapsed | 1929-05-10 | 1935-05-07 | 0 | Details |
| US1998939A | Contouring device | Expired / Lapsed | 1934-03-31 | 1935-04-23 | 0 | Details |
| US1998952A | Rail inspection apparatus | Expired / Lapsed | 1934-03-15 | 1935-04-23 | 0 | Details |
| US1998938A | Control system | Expired / Lapsed | 1932-10-15 | 1935-04-23 | 0 | Details |
| US1998950A | Control system for electron discharge devices | Expired / Lapsed | 1932-02-25 | 1935-04-23 | 0 | Details |
| US1998309A | Halogenated composition | Expired / Lapsed | 1933-11-29 | 1935-04-16 | 0 | Details |
| US1998393A | Turbine bucket | Expired / Lapsed | 1933-09-30 | 1935-04-16 | 0 | Details |
| US1998334A | Electric radiation indicator | Expired / Lapsed | 1932-07-29 | 1935-04-16 | 0 | Details |
| US1996569A | Piezo-electric device | Expired / Lapsed | 1929-11-16 | 1935-04-02 | 0 | Details |
| US1995877A | Selective system | Expired / Lapsed | 1934-03-21 | 1935-03-26 | 0 | Details |
| US1995890A | Counting apparatus | Expired / Lapsed | 1932-08-19 | 1935-03-26 | 0 | Details |
| US1995863A | Electric lamp | Expired / Lapsed | 1932-07-29 | 1935-03-26 | 0 | Details |
| US1996041A | Electrical regulator | Expired / Lapsed | 1932-07-29 | 1935-03-26 | 0 | Details |
| US1995881A | Counting apparatus | Expired / Lapsed | 1932-01-30 | 1935-03-26 | 0 | Details |
| US1994324A | Electric circuit control means | Expired / Lapsed | 1932-05-26 | 1935-03-12 | 0 | Details |
| US1994325A | Electric circuits | Expired / Lapsed | 1932-05-26 | 1935-03-12 | 0 | Details |
| US1993580A | Electric terminal connection and method of making the same | Expired / Lapsed | 1932-02-20 | 1935-03-05 | 0 | Details |
| US1993581A | System of distribution | Expired / Lapsed | 1923-05-11 | 1935-03-05 | 0 | Details |
| US1992826A | Synchronous motor | Expired / Lapsed | 1934-09-05 | 1935-02-26 | 0 | Details |
| US1991443A | Direction finder | Expired / Lapsed | 1932-10-26 | 1935-02-19 | 0 | Details |
| US1992055A | Photo-electric relay apparatus | Expired / Lapsed | 1932-06-29 | 1935-02-19 | 0 | Details |
| US1991223A | Packing machine | Expired / Lapsed | 1932-08-08 | 1935-02-12 | 0 | Details |
| US1990781A | Resistance-capacitance coupled amplifier | Expired / Lapsed | 1932-04-28 | 1935-02-12 | 0 | Details |
| US1990388A | Changeover device | Expired / Lapsed | 1930-03-04 | 1935-02-05 | 0 | Details |
| US1989501A | Control system | Expired / Lapsed | 1933-03-18 | 1935-01-29 | 0 | Details |
| US1989509A | Carrier current selector system | Expired / Lapsed | 1928-01-24 | 1935-01-29 | 0 | Details |
| US1988931A | Colored television apparatus | Expired / Lapsed | 1933-05-02 | 1935-01-22 | 0 | Details |
| US1988274A | Electrical apparatus | Expired / Lapsed | 1931-07-09 | 1935-01-15 | 0 | Details |
| US1987577A | Apparatus for the thermic treatment of metal wires, filamen… | Expired / Lapsed | 1932-11-22 | 1935-01-08 | 0 | Details |
| US1987576A | Method of applying coatings on metals | Expired / Lapsed | 1930-10-21 | 1935-01-08 | 0 | Details |
| US1985982A | Control system | Expired / Lapsed | 1934-03-21 | 1935-01-01 | 0 | Details |
| US1985981A | Control system | Expired / Lapsed | 1932-12-10 | 1935-01-01 | 0 | Details |
| US1985964A | Elastic fluid turbine | Expired / Lapsed | 1932-09-13 | 1935-01-01 | 0 | Details |
| US1985911A | Railway signal system | Expired / Lapsed | 1930-06-06 | 1935-01-01 | 0 | Details |
| US1984489A | Gaseous electric discharge lamp device | Expired / Lapsed | 1933-01-24 | 1934-12-18 | 0 | Details |
| US1984482A | Gaseous electric discharge device | Expired / Lapsed | 1931-12-21 | 1934-12-18 | 0 | Details |
| US1983321A | Welding apparatus | Expired / Lapsed | 1933-09-19 | 1934-12-04 | 0 | Details |
| US1983342A | Carrier conveyer system | Expired / Lapsed | 1932-06-16 | 1934-12-04 | 0 | Details |
| US1980799A | Control system | Expired / Lapsed | 1933-03-01 | 1934-11-13 | 0 | Details |
| US1980899A | Alternating current generator | Expired / Lapsed | 1931-01-28 | 1934-11-13 | 0 | Details |
| US1980855A | Electric discharge device | Expired / Lapsed | 1929-01-28 | 1934-11-13 | 0 | Details |
| US1980151A | Abradant material and process of its manufacture | Expired / Lapsed | 1926-12-03 | 1934-11-06 | 0 | Details |
| US1979082A | Electric heater | Expired / Lapsed | 1933-03-31 | 1934-10-30 | 0 | Details |
| US1979102A | Controlling rate of acceleration and retardation of elevato… | Expired / Lapsed | 1931-08-21 | 1934-10-30 | 0 | Details |
| US1978170A | Material handling truck | Expired / Lapsed | 1933-07-12 | 1934-10-23 | 0 | Details |
| US1978233A | Pressure reservoir for cables | Expired / Lapsed | 1932-12-22 | 1934-10-23 | 0 | Details |
| US1978165A | Process of manufacture of selenium tubes | Expired / Lapsed | 1931-09-11 | 1934-10-23 | 0 | Details |
| US1977325A | High voltage cable | Expired / Lapsed | 1932-12-24 | 1934-10-16 | 0 | Details |
| US1976659A | Governing mechanism for elastic fluid engines | Expired / Lapsed | 1934-05-03 | 1934-10-09 | 0 | Details |
| US1976547A | Filter for liquid and gas substances | Expired / Lapsed | 1933-09-14 | 1934-10-09 | 0 | Details |
| US1976562A | Regenerative braking | Expired / Lapsed | 1933-08-24 | 1934-10-09 | 0 | Details |
| US1976556A | Method of treating dry rectifiers | Expired / Lapsed | 1932-02-06 | 1934-10-09 | 0 | Details |
| US1976461A | Control system | Expired / Lapsed | 1931-11-30 | 1934-10-09 | 0 | Details |
| US1975578A | Welding machine | Expired / Lapsed | 1933-04-20 | 1934-10-02 | 0 | Details |
| US1974978A | Automatic reclosing circuit breaker system | Expired / Lapsed | 1933-11-17 | 1934-09-25 | 0 | Details |
| US1973673A | Sound or air wave apparatus | Expired / Lapsed | 1931-12-10 | 1934-09-11 | 0 | Details |
| US1971827A | Fan | Expired / Lapsed | 1932-02-09 | 1934-08-28 | 0 | Details |
| US1971189A | Magnetic detector | Expired / Lapsed | 1933-02-01 | 1934-08-21 | 0 | Details |
| US1971191A | Light responsive circuit controller | Expired / Lapsed | 1932-11-16 | 1934-08-21 | 0 | Details |
| US1971207A | Current transformer | Expired / Lapsed | 1928-06-27 | 1934-08-21 | 0 | Details |
| US1970103A | Control system | Expired / Lapsed | 1932-03-25 | 1934-08-14 | 0 | Details |
| US1970427A | Thyratron equipment | Expired / Lapsed | 1932-01-30 | 1934-08-14 | 0 | Details |
| US1970423A | Signaling system | Expired / Lapsed | 1931-12-18 | 1934-08-14 | 0 | Details |
| US1969536A | Apparatus for controlling the thickness of strip material | Expired / Lapsed | 1932-02-18 | 1934-08-07 | 0 | Details |
| US1968576A | Control apparatus for alternating current circuits | Expired / Lapsed | 1933-09-23 | 1934-07-31 | 0 | Details |
| US1968600A | Electrical winding | Expired / Lapsed | 1933-06-09 | 1934-07-31 | 0 | Details |
| US1968619A | Electrical switch gear | Expired / Lapsed | 1932-07-30 | 1934-07-31 | 0 | Details |
| US1967895A | Electrostatic potential difference measuring device | Expired / Lapsed | 1932-07-27 | 1934-07-24 | 0 | Details |
| US1967871A | Means and method of detecting leaks in refrigerating systems | Expired / Lapsed | 1931-06-15 | 1934-07-24 | 0 | Details |
| US1967887A | Remote indicating system | Expired / Lapsed | 1931-04-24 | 1934-07-24 | 0 | Details |
| US1966163A | Electric device and dielectric material therefor | Expired / Lapsed | 1932-09-29 | 1934-07-10 | 0 | Details |
| US1965416A | Electric valve circuits | Expired / Lapsed | 1931-10-01 | 1934-07-03 | 0 | Details |
| US1962935A | Rayon spinning bucket | Expired / Lapsed | 1932-12-14 | 1934-06-12 | 0 | Details |
| US1961783A | Inductance coil | Expired / Lapsed | 1933-11-23 | 1934-06-05 | 0 | Details |
| US1961793A | Adjustable speed split phase motor | Expired / Lapsed | 1933-11-18 | 1934-06-05 | 0 | Details |
| US1961825A | Tellurium alloy rectifier | Expired / Lapsed | 1932-05-10 | 1934-06-05 | 0 | Details |
| US1961749A | Gaseous electric discharge device | Expired / Lapsed | 1931-08-28 | 1934-06-05 | 0 | Details |
| US1961007A | Vibration velocity measuring device | Expired / Lapsed | 1933-03-18 | 1934-05-29 | 0 | Details |
| US1960058A | Composite support and condenser | Expired / Lapsed | 1932-03-31 | 1934-05-22 | 0 | Details |
| US1959188A | Electric valve converting apparatus | Expired / Lapsed | 1933-11-15 | 1934-05-15 | 0 | Details |
| US1959238A | Sorting device | Expired / Lapsed | 1930-02-28 | 1934-05-15 | 0 | Details |
| US1959150A | Terminal lug and method of joining same to alpha conductor | Expired / Lapsed | 1929-11-22 | 1934-05-15 | 0 | Details |
| US1958245A | Control system | Expired / Lapsed | 1932-12-29 | 1934-05-08 | 0 | Details |
| US1958259A | Automatic steering equipment | Expired / Lapsed | 1931-08-12 | 1934-05-08 | 0 | Details |
| US1957230A | Electric valve converting system | Expired / Lapsed | 1933-08-02 | 1934-05-01 | 0 | Details |
| US1957222A | Testing and sorting of electrically conducting parts | Expired / Lapsed | 1932-09-30 | 1934-05-01 | 0 | Details |
| US1957247A | Photo-electric relay | Expired / Lapsed | 1932-01-21 | 1934-05-01 | 0 | Details |
| US1957240A | Control system | Expired / Lapsed | 1931-11-16 | 1934-05-01 | 0 | Details |
| US1956977A | Combined regulating and snap action gas valve | Expired / Lapsed | 1931-01-12 | 1934-05-01 | 0 | Details |
| US1957236A | Circuit control means | Expired / Lapsed | 1930-11-10 | 1934-05-01 | 0 | Details |
| US1956416A | High voltage discharge apparatus | Expired / Lapsed | 1930-08-28 | 1934-04-24 | 0 | Details |
| US1955545A | Thermostatic control for thermionic arc discharge devices | Expired / Lapsed | 1931-05-25 | 1934-04-17 | 0 | Details |
| US1954678A | Electric heating apparatus | Expired / Lapsed | 1932-11-29 | 1934-04-10 | 0 | Details |
| US1954657A | Reversible split phase motor | Expired / Lapsed | 1931-11-05 | 1934-04-10 | 0 | Details |
| US1953775A | Circuits for relaying or amplifying direct or alternating c… | Expired / Lapsed | 1931-09-19 | 1934-04-03 | 0 | Details |
| US1952153A | Electric switch | Expired / Lapsed | 1932-12-24 | 1934-03-27 | 0 | Details |
| US1952186A | Variable pulsation apparatus | Expired / Lapsed | 1932-10-01 | 1934-03-27 | 0 | Details |
| US1952171A | Motor control system for automatic poise devices | Expired / Lapsed | 1931-09-03 | 1934-03-27 | 0 | Details |
| US1952899A | Compass | Expired / Lapsed | 1929-11-19 | 1934-03-27 | 0 | Details |
| US1951116A | Electric discharge tube for the emission of rays of light | Expired / Lapsed | 1930-12-12 | 1934-03-13 | 0 | Details |
| US1949216A | Power system | Expired / Lapsed | 1933-04-08 | 1934-02-27 | 0 | Details |
| US1948261A | Luminous electric discharge tube | Expired / Lapsed | 1933-07-11 | 1934-02-20 | 0 | Details |
| US1948084A | Clutch | Expired / Lapsed | 1933-03-18 | 1934-02-20 | 0 | Details |
| US1948372A | Regulating system | Expired / Lapsed | 1931-09-02 | 1934-02-20 | 0 | Details |
| US1947240A | Rectifier for motion picture projectors | Expired / Lapsed | 1932-10-12 | 1934-02-13 | 0 | Details |
| US1947255A | Telemetric system | Expired / Lapsed | 1929-10-05 | 1934-02-13 | 0 | Details |
| US1946710A | Magnetic compass | Expired / Lapsed | 1928-12-06 | 1934-02-13 | 0 | Details |
| US1946297A | Alternating current control apparatus | Expired / Lapsed | 1933-04-26 | 1934-02-06 | 0 | Details |
| US1945666A | Indicating system | Expired / Lapsed | 1928-11-22 | 1934-02-06 | 0 | Details |
| US1945665A | Supervisory control system | Expired / Lapsed | 1928-03-08 | 1934-02-06 | 0 | Details |
| US1945395A | Sorting apparatus | Expired / Lapsed | 1932-02-25 | 1934-01-30 | 0 | Details |
| US1944988A | Control system | Expired / Lapsed | 1928-07-24 | 1934-01-30 | 0 | Details |
| US1944072A | Automatic reclosing circuit breaker system | Expired / Lapsed | 1931-04-17 | 1934-01-16 | 0 | Details |
| US1943109A | Cathode ray sound recording | Expired / Lapsed | 1931-08-18 | 1934-01-09 | 0 | Details |
| US1941377A | Time selector mechanism | Expired / Lapsed | 1931-07-01 | 1933-12-26 | 0 | Details |
| US1940335A | Electrical time delay apparatus | Expired / Lapsed | 1932-03-25 | 1933-12-19 | 0 | Details |
| US1939435A | Photo-electric relay apparatus | Expired / Lapsed | 1932-04-28 | 1933-12-12 | 0 | Details |
| US1938806A | Roll capacitor | Expired / Lapsed | 1929-01-23 | 1933-12-12 | 0 | Details |
| US1937378A | Sound-motion picture producer | Expired / Lapsed | 1933-05-02 | 1933-11-28 | 0 | Details |
| US1937375A | Instrument for transmitting angular movement | Expired / Lapsed | 1933-03-30 | 1933-11-28 | 0 | Details |
| US1937372A | Electric valve converting system | Expired / Lapsed | 1932-05-27 | 1933-11-28 | 0 | Details |
| US1937431A | Process of making cable terminals | Expired / Lapsed | 1931-12-14 | 1933-11-28 | 0 | Details |
| US1937333A | Magnetostriction oscillation generator | Expired / Lapsed | 1929-10-23 | 1933-11-28 | 0 | Details |
| US1935729A | Beacon or searchlight | Expired / Lapsed | 1932-03-17 | 1933-11-21 | 0 | Details |
| US1936414A | Electric measuring instrument | Expired / Lapsed | 1931-11-09 | 1933-11-21 | 0 | Details |
| US1936400A | Method and means for signal to aircraft | Expired / Lapsed | 1930-01-27 | 1933-11-21 | 0 | Details |
| US1936442A | Gun fire control apparatus | Expired / Lapsed | 1927-08-29 | 1933-11-21 | 0 | Details |
| US1935413A | Welding | Expired / Lapsed | 1930-08-12 | 1933-11-14 | 0 | Details |
| US1934499A | Temperature control device | Expired / Lapsed | 1932-01-05 | 1933-11-07 | 0 | Details |
| US1934438A | Explosion safety door for combustion chambers | Expired / Lapsed | 1931-08-14 | 1933-11-07 | 0 | Details |
| US1934484A | Camera | Expired / Lapsed | 1931-01-31 | 1933-11-07 | 0 | Details |
| US1933311A | Regulating mechanism for prime movers | Expired / Lapsed | 1932-07-29 | 1933-10-31 | 0 | Details |
| US1933497A | Wound rotor reactor motor | Expired / Lapsed | 1931-09-29 | 1933-10-31 | 0 | Details |
| US1933306A | Electrical frequency analyzer | Expired / Lapsed | 1931-04-30 | 1933-10-31 | 0 | Details |
| US1932278A | Method of manufacturing nozzle diaphragms and the like | Expired / Lapsed | 1932-03-25 | 1933-10-24 | 0 | Details |
| US1932269A | Temperature control device for oil burners | Expired / Lapsed | 1931-08-25 | 1933-10-24 | 0 | Details |
| US1931071A | Carrier system | Expired / Lapsed | 1932-07-26 | 1933-10-17 | 0 | Details |
| US1930333A | Protective arrangement | Expired / Lapsed | 1932-07-08 | 1933-10-10 | 0 | Details |
| US1929293A | Electrical switch gear | Expired / Lapsed | 1931-05-25 | 1933-10-03 | 0 | Details |
| US1929259A | Speed and frequency indicator | Expired / Lapsed | 1930-06-30 | 1933-10-03 | 0 | Details |
| US1929241A | Telemetric system | Expired / Lapsed | 1927-07-07 | 1933-10-03 | 0 | Details |
| US1928457A | Electric gauge | Expired / Lapsed | 1929-09-12 | 1933-09-26 | 0 | Details |
| US1927676A | Electric timing and counting device | Expired / Lapsed | 1932-03-09 | 1933-09-19 | 0 | Details |
| US1927792A | Photo-electric tube | Expired / Lapsed | 1931-12-01 | 1933-09-19 | 0 | Details |
| US1927794A | Differential protection for electric apparatus | Expired / Lapsed | 1930-09-02 | 1933-09-19 | 0 | Details |
| US1926275A | Electric regulator | Expired / Lapsed | 1931-07-20 | 1933-09-12 | 0 | Details |
| US1925028A | Heat treating apparatus | Expired / Lapsed | 1932-07-28 | 1933-08-29 | 0 | Details |
| US1923745A | Electrically operated weighing scale | Expired / Lapsed | 1932-01-21 | 1933-08-22 | 0 | Details |
| US1922883A | Material handling system | Expired / Lapsed | 1930-06-26 | 1933-08-15 | 0 | Details |
| US1921703A | Variable reactance device | Expired / Lapsed | 1931-11-13 | 1933-08-08 | 0 | Details |
| US1921787A | Pulsation apparatus | Expired / Lapsed | 1931-01-23 | 1933-08-08 | 0 | Details |
| US1920781A | Power plant | Expired / Lapsed | 1932-04-28 | 1933-08-01 | 0 | Details |
| US1919983A | Method for producing low loss nonaging silicon steel sheets | Expired / Lapsed | 1932-03-01 | 1933-07-25 | 0 | Details |
| US1919949A | Electric heating system | Expired / Lapsed | 1931-09-10 | 1933-07-25 | 0 | Details |
| US1919985A | Cathode ray oscillograph sweep circuit | Expired / Lapsed | 1931-07-23 | 1933-07-25 | 0 | Details |
| US1919976A | Electric power converting apparatus | Expired / Lapsed | 1931-01-26 | 1933-07-25 | 0 | Details |
| US1919982A | Compass | Expired / Lapsed | 1930-08-07 | 1933-07-25 | 0 | Details |
| US1919984A | Method of making grid structures | Expired / Lapsed | 1930-07-01 | 1933-07-25 | 0 | Details |
| US1919992A | Impulse storage mechanism | Expired / Lapsed | 1929-01-18 | 1933-07-25 | 0 | Details |
| US1919053A | Electric control circuit | Expired / Lapsed | 1931-12-10 | 1933-07-18 | 0 | Details |
| US1919182A | Photo-electric system | Expired / Lapsed | 1931-06-04 | 1933-07-18 | 0 | Details |
| US1918064A | Method of making strong, thin, cemented carbide disks | Expired / Lapsed | 1930-09-08 | 1933-07-11 | 0 | Details |
| US1918071A | Cord terminal | Expired / Lapsed | 1928-02-01 | 1933-07-11 | 0 | Details |
| US1918070A | Electrical cord terminal | Expired / Lapsed | 1927-01-24 | 1933-07-11 | 0 | Details |
| US1917129A | Temperature indicator | Expired / Lapsed | 1931-12-21 | 1933-07-04 | 0 | Details |
| US1917082A | System of electric power transmission | Expired / Lapsed | 1931-12-16 | 1933-07-04 | 0 | Details |
| US1915993A | Statistical machine | Expired / Lapsed | 1931-04-27 | 1933-06-27 | 0 | Details |
| US1915969A | Electrical arc resistant material | Expired / Lapsed | 1930-11-19 | 1933-06-27 | 0 | Details |
| US1916016A | Signaling system | Expired / Lapsed | 1930-03-20 | 1933-06-27 | 0 | Details |
| US1915019A | Gaseous electric discharge device | Expired / Lapsed | 1932-08-22 | 1933-06-20 | 0 | Details |
| US1915074A | Electric distribution system | Expired / Lapsed | 1931-04-17 | 1933-06-20 | 0 | Details |
| US1914193A | Electrical regulating circuit | Expired / Lapsed | 1931-04-27 | 1933-06-13 | 0 | Details |
| US1913200A | Oscillographic transient recorder | Expired / Lapsed | 1931-10-07 | 1933-06-06 | 0 | Details |
| US1913188A | Supervisory system | Expired / Lapsed | 1930-06-09 | 1933-06-06 | 0 | Details |
| US1913214A | Conducting varnish | Expired / Lapsed | 1930-01-21 | 1933-06-06 | 0 | Details |
| US1913148A | Method and means for indicating altitude from aircraft | Expired / Lapsed | 1929-04-08 | 1933-06-06 | 0 | Details |
| US1910202A | Electric regulating system | Expired / Lapsed | 1931-12-31 | 1933-05-23 | 0 | Details |
| US1911033A | Atomic gas torch | Expired / Lapsed | 1930-08-25 | 1933-05-23 | 0 | Details |
| US1907471A | Indicating system for aircraft | Expired / Lapsed | 1931-11-16 | 1933-05-09 | 0 | Details |
| US1908250A | Motor control system | Expired / Lapsed | 1930-05-07 | 1933-05-09 | 0 | Details |
| US1907507A | Electron discharge device | Expired / Lapsed | 1925-04-28 | 1933-05-09 | 0 | Details |
| US1906817A | Protective arrangement | Expired / Lapsed | 1932-01-09 | 1933-05-02 | 0 | Details |
| US1906441A | Amplifying electrical impulses | Expired / Lapsed | 1928-10-17 | 1933-05-02 | 0 | Details |
| US1905703A | Contact rectifier | Expired / Lapsed | 1930-12-05 | 1933-04-25 | 0 | Details |
| US1904485A | Control system | Expired / Lapsed | 1931-09-11 | 1933-04-18 | 0 | Details |
| US1904095A | Electrical measuring instrument | Expired / Lapsed | 1931-04-16 | 1933-04-18 | 0 | Details |
| US1904418A | Method of insulation | Expired / Lapsed | 1929-10-11 | 1933-04-18 | 0 | Details |
| US1902510A | Electrical discharge device | Expired / Lapsed | 1932-01-20 | 1933-03-21 | 0 | Details |
| US1902485A | Electrical control system | Expired / Lapsed | 1931-11-13 | 1933-03-21 | 0 | Details |
| US1902496A | High frequency measurement | Expired / Lapsed | 1931-05-27 | 1933-03-21 | 0 | Details |
| US1902465A | Centralized meter recording | Expired / Lapsed | 1930-08-12 | 1933-03-21 | 0 | Details |
| US1902471A | Electromagnetic clutch | Expired / Lapsed | 1929-09-03 | 1933-03-21 | 0 | Details |
| US1901701A | Transformer fault detector | Expired / Lapsed | 1932-09-30 | 1933-03-14 | 0 | Details |
| US1901694A | Phase shifting circuits | Expired / Lapsed | 1930-08-27 | 1933-03-14 | 0 | Details |
| US1900573A | Electric heating apparatus | Expired / Lapsed | 1930-11-19 | 1933-03-07 | 0 | Details |
| US1900596A | Electric control system | Expired / Lapsed | 1930-09-04 | 1933-03-07 | 0 | Details |
| US1900595A | Circuit controlling and protective device | Expired / Lapsed | 1930-03-18 | 1933-03-07 | 0 | Details |
| US1899540A | Lightning arrester | Expired / Lapsed | 1931-09-11 | 1933-02-28 | 0 | Details |
| US1899591A | Laminated material | Expired / Lapsed | 1930-09-08 | 1933-02-28 | 0 | Details |
| US1897845A | Control system | Expired / Lapsed | 1930-09-16 | 1933-02-14 | 0 | Details |
| US1896853A | Welding process | Expired / Lapsed | 1930-09-22 | 1933-02-07 | 0 | Details |
| US1896534A | Electrical system | Expired / Lapsed | 1927-05-13 | 1933-02-07 | 0 | Details |
| US1895373A | Apparatus for measuring magnetic fields | Expired / Lapsed | 1930-12-24 | 1933-01-24 | 0 | Details |
| US1895376A | Electric capacitor | Expired / Lapsed | 1930-02-01 | 1933-01-24 | 0 | Details |
| US1894079A | Electric valve converting system | Expired / Lapsed | 1932-05-05 | 1933-01-10 | 0 | Details |
| US1894119A | Current limiter | Expired / Lapsed | 1931-10-30 | 1933-01-10 | 0 | Details |
| US1894132A | Color analyzer | Expired / Lapsed | 1931-08-10 | 1933-01-10 | 0 | Details |
| US1893772A | Electrical regulator | Expired / Lapsed | 1931-04-17 | 1933-01-10 | 0 | Details |
| US1893780A | Electric regulator | Expired / Lapsed | 1931-04-17 | 1933-01-10 | 0 | Details |
| US1893768A | Electric regulator | Expired / Lapsed | 1931-04-17 | 1933-01-10 | 0 | Details |
| US1893380A | Soldering apparatus | Expired / Lapsed | 1930-10-31 | 1933-01-03 | 0 | Details |
| US1893337A | Lightning field intensity recorder | Expired / Lapsed | 1929-12-28 | 1933-01-03 | 0 | Details |
| US1893332A | Control system | Expired / Lapsed | 1929-01-29 | 1933-01-03 | 0 | Details |
| US1893365A | Circuit controller | Expired / Lapsed | 1927-07-13 | 1933-01-03 | 0 | Details |
| US1891926A | Mixing valve | Expired / Lapsed | 1930-04-15 | 1932-12-27 | 0 | Details |
| US1890339A | Cathode structure | Expired / Lapsed | 1932-05-03 | 1932-12-06 | 0 | Details |
| US1889597A | Telemetering method and apparatus | Expired / Lapsed | 1929-05-29 | 1932-11-29 | 0 | Details |
| US1889522A | Electrical capacitor | Expired / Lapsed | 1928-08-23 | 1932-11-29 | 0 | Details |
| US1888341A | Composite silica article | Expired / Lapsed | 1930-11-06 | 1932-11-22 | 0 | Details |
| US1888856A | Automatic switching system | Expired / Lapsed | 1929-11-30 | 1932-11-22 | 0 | Details |
| US1888099A | Circuit controlling apparatus | Expired / Lapsed | 1930-05-10 | 1932-11-15 | 0 | Details |
| US1888071A | Seal for electric discharge devices | Expired / Lapsed | 1929-12-28 | 1932-11-15 | 0 | Details |
| US1886682A | Cable testing equipment | Expired / Lapsed | 1932-03-24 | 1932-11-08 | 0 | Details |
| US1885155A | Control of constant current circuits | Expired / Lapsed | 1932-02-18 | 1932-11-01 | 0 | Details |
| US1883907A | Automatic oscillograph | Expired / Lapsed | 1931-06-05 | 1932-10-25 | 0 | Details |
| US1884252A | Rotary disk, turbine bucket wheel, or the like | Expired / Lapsed | 1931-05-19 | 1932-10-25 | 0 | Details |
| US1883893A | Chassis for electrical apparatus | Expired / Lapsed | 1930-05-30 | 1932-10-25 | 0 | Details |
| US1879388A | Automatic control of feeding mechanism in tool machines | Expired / Lapsed | 1931-10-23 | 1932-09-27 | 0 | Details |
| US1879561A | Diffuser for centrifugal compressors | Expired / Lapsed | 1931-04-13 | 1932-09-27 | 0 | Details |
| US1879575A | Barometer and temperature correcting means and constant vol… | Expired / Lapsed | 1931-03-05 | 1932-09-27 | 0 | Details |
| US1879253A | Tellurium resistor for refrigerators | Expired / Lapsed | 1930-03-03 | 1932-09-27 | 0 | Details |
| US1880108A | Gear pump and the like | Expired / Lapsed | 1929-02-04 | 1932-09-27 | 0 | Details |
| US1874723A | Electrical coil | Expired / Lapsed | 1931-09-18 | 1932-08-30 | 0 | Details |
| US1874136A | Turbine plant | Expired / Lapsed | 1931-08-03 | 1932-08-30 | 0 | Details |
| US1874777A | Electric power control apparatus | Expired / Lapsed | 1930-08-26 | 1932-08-30 | 0 | Details |
| US1874240A | Electrical circuit regulator | Expired / Lapsed | 1930-04-29 | 1932-08-30 | 0 | Details |
| US1875241A | Electrical cord terminal | Expired / Lapsed | 1930-01-13 | 1932-08-30 | 0 | Details |
| US1874840A | Rectification of alternating current | Expired / Lapsed | 1929-08-21 | 1932-08-30 | 0 | Details |
| US1873776A | Method of basing vacuum tubes and similar articles | Expired / Lapsed | 1926-03-31 | 1932-08-23 | 0 | Details |
| US1872530A | High tension circuit interrupter | Expired / Lapsed | 1930-11-25 | 1932-08-16 | 0 | Details |
| US1870064A | Electrical regulator | Expired / Lapsed | 1931-07-29 | 1932-08-02 | 0 | Details |
| US1870022A | Electric translating circuit | Expired / Lapsed | 1931-04-17 | 1932-08-02 | 0 | Details |
| US1869134A | Regulating arrangement for prime movers | Expired / Lapsed | 1931-11-17 | 1932-07-26 | 0 | Details |
| US1869209A | Thermionic measuring device | Expired / Lapsed | 1931-10-16 | 1932-07-26 | 0 | Details |
| US1869169A | Electrical condenser | Expired / Lapsed | 1927-12-21 | 1932-07-26 | 0 | Details |
| US1864363A | Recording apparatus | Expired / Lapsed | 1930-04-21 | 1932-06-21 | 0 | Details |
| US1863829A | Multiplex signaling system | Expired / Lapsed | 1925-06-30 | 1932-06-21 | 0 | Details |
| US1863406A | Governing mechanism for turbine driven pumps | Expired / Lapsed | 1931-03-09 | 1932-06-14 | 0 | Details |
| US1862354A | Motor control system | Expired / Lapsed | 1930-10-28 | 1932-06-07 | 0 | Details |
| US1859069A | System of electric distribution | Expired / Lapsed | 1929-07-19 | 1932-05-17 | 0 | Details |
| US1857174A | Electric regulating system | Expired / Lapsed | 1931-04-17 | 1932-05-10 | 0 | Details |
| US1857220A | Switch operating mechanism | Expired / Lapsed | 1930-07-11 | 1932-05-10 | 0 | Details |
| US1857128A | Electron discharge system | Expired / Lapsed | 1930-03-28 | 1932-05-10 | 0 | Details |
| US1856832A | Circuit controller | Expired / Lapsed | 1930-01-13 | 1932-05-03 | 0 | Details |
| US1855886A | Electron discharge device | Expired / Lapsed | 1927-08-19 | 1932-04-26 | 0 | Details |
| US1854986A | Method and means for producing high frequencies | Expired / Lapsed | 1930-05-17 | 1932-04-19 | 0 | Details |
| US1853964A | Electric switch | Expired / Lapsed | 1930-03-15 | 1932-04-12 | 0 | Details |
| US1853973A | Centrifugal compressor or blower | Expired / Lapsed | 1928-12-04 | 1932-04-12 | 0 | Details |
| US1853953A | Tuned electrical circuits | Expired / Lapsed | 1928-11-13 | 1932-04-12 | 0 | Details |
| US1853021A | Means for eliminating fading | Expired / Lapsed | 1927-11-15 | 1932-04-12 | 0 | Details |
| US1851692A | Electric regulator | Expired / Lapsed | 1931-04-17 | 1932-03-29 | 0 | Details |
| US1851721A | Oscillation generator | Expired / Lapsed | 1930-05-22 | 1932-03-29 | 0 | Details |
| US1851739A | Circuit protective device | Expired / Lapsed | 1927-02-17 | 1932-03-29 | 0 | Details |
| US1851246A | Circuit controller | Expired / Lapsed | 1926-07-26 | 1932-03-29 | 0 | Details |
| US1849818A | Picture transmission | Expired / Lapsed | 1930-09-19 | 1932-03-15 | 0 | Details |
| US1849827A | Telemetric system | Expired / Lapsed | 1927-07-01 | 1932-03-15 | 0 | Details |
| US1849870A | Telemetric system | Expired / Lapsed | 1927-05-26 | 1932-03-15 | 0 | Details |
| US1849832A | Thermocouple | Expired / Lapsed | 1927-04-20 | 1932-03-15 | 0 | Details |
| US1847918A | Recording instrument | Expired / Lapsed | 1929-03-14 | 1932-03-01 | 0 | Details |
| DE545200C | Procedure for keeping the degree of amplification constant … | Expired / Lapsed | 1929-10-08 | 1932-02-26 | 0 | Details |
| US1844375A | Gaseous electric discharge device | Expired / Lapsed | 1931-02-24 | 1932-02-09 | 0 | Details |
| US1844704A | Electrical control system | Expired / Lapsed | 1930-08-28 | 1932-02-09 | 0 | Details |
| US1844705A | Piezo-electric apparatus | Expired / Lapsed | 1928-05-01 | 1932-02-09 | 0 | Details |
| US1844648A | Carrier current supervisory system | Expired / Lapsed | 1927-03-05 | 1932-02-09 | 0 | Details |
| US1843005A | Refrigerating machine | Expired / Lapsed | 1928-09-12 | 1932-01-26 | 0 | Details |
| US1841628A | Electrical condenser | Expired / Lapsed | 1927-11-23 | 1932-01-19 | 0 | Details |
| US1840139A | Electrical coil | Expired / Lapsed | 1929-02-26 | 1932-01-05 | 0 | Details |
| US1838819A | Grid making machine | Expired / Lapsed | 1926-02-10 | 1931-12-29 | 0 | Details |
| US1837962A | Manufacture of electrical apparatus | Expired / Lapsed | 1928-07-03 | 1931-12-22 | 0 | Details |
| US1836813A | Hydraulic operating mechanism | Expired / Lapsed | 1929-09-11 | 1931-12-15 | 0 | Details |
| US1836838A | Control of electric switches | Expired / Lapsed | 1927-04-27 | 1931-12-15 | 0 | Details |
| US1836725A | Electrical apparatus | Expired / Lapsed | 1923-02-28 | 1931-12-15 | 0 | Details |
| US1835916A | Circuit controlling means | Expired / Lapsed | 1926-08-02 | 1931-12-08 | 0 | Details |
| US1834898A | Magnetic core | Expired / Lapsed | 1930-05-21 | 1931-12-01 | 0 | Details |
| US1834786A | Electrical control means | Expired / Lapsed | 1930-01-18 | 1931-12-01 | 0 | Details |
| US1834771A | Remote control apparatus | Expired / Lapsed | 1925-01-26 | 1931-12-01 | 0 | Details |
| US1833754A | Vibration damping by impact | Expired / Lapsed | 1930-08-22 | 1931-11-24 | 0 | Details |
| US1833788A | High frequency electrical apparatus | Expired / Lapsed | 1928-05-18 | 1931-11-24 | 0 | Details |
| US1831555A | Foundry core | Expired / Lapsed | 1930-01-17 | 1931-11-10 | 0 | Details |
| US1830598A | Method and apparatus for coloring lamps | Expired / Lapsed | 1928-10-15 | 1931-11-03 | 0 | Details |
| US1828556A | Method of rapid transmission of signals and messages | Expired / Lapsed | 1929-12-14 | 1931-10-20 | 0 | Details |
| US1827571A | Insulation of electrical apparatus | Expired / Lapsed | 1930-10-08 | 1931-10-13 | 0 | Details |
| US1825514A | Apparatus for measuring direct currents | Expired / Lapsed | 1930-11-29 | 1931-09-29 | 0 | Details |
| US1825551A | Electrical recording | Expired / Lapsed | 1930-06-18 | 1931-09-29 | 0 | Details |
| US1824635A | Synchronization in television and facsimile transmission sy… | Expired / Lapsed | 1930-10-21 | 1931-09-22 | 0 | Details |
| US1823716A | System for producing music | Expired / Lapsed | 1930-05-22 | 1931-09-15 | 0 | Details |
| US1821754A | Air cooled condenser for refrigerating systems | Expired / Lapsed | 1930-04-22 | 1931-09-01 | 0 | Details |
| US1821836A | Pick-up device | Expired / Lapsed | 1930-04-07 | 1931-09-01 | 0 | Details |
| US1821787A | Retarding device | Expired / Lapsed | 1929-08-19 | 1931-09-01 | 0 | Details |
| US1821894A | Automatic mount making machine for incandescent lamps and s… | Expired / Lapsed | 1928-12-27 | 1931-09-01 | 0 | Details |
| US1821808A | Space discharge device | Expired / Lapsed | 1927-08-31 | 1931-09-01 | 0 | Details |
| US1819868A | Electroresponsive device | Expired / Lapsed | 1924-12-08 | 1931-08-18 | 0 | Details |
| US1818963A | Speed control apparatus | Expired / Lapsed | 1930-10-07 | 1931-08-11 | 0 | Details |
| US1817758A | Phonograph apparatus | Expired / Lapsed | 1929-11-20 | 1931-08-04 | 0 | Details |
| US1817744A | Indicating system | Expired / Lapsed | 1926-05-21 | 1931-08-04 | 0 | Details |
| US1816718A | Shielded radio receiving apparatus and the like | Expired / Lapsed | 1930-02-19 | 1931-07-28 | 0 | Details |
| US1816683A | Filament mounting machine | Expired / Lapsed | 1927-12-30 | 1931-07-28 | 0 | Details |
| US1816737A | Supercharger for internal combustion engines | Expired / Lapsed | 1925-07-27 | 1931-07-28 | 0 | Details |
| US1814843A | Kerr cell | Expired / Lapsed | 1929-12-26 | 1931-07-14 | 0 | Details |
| US1812816A | Power wrench | Expired / Lapsed | 1930-04-24 | 1931-06-30 | 0 | Details |
| US1809673A | Electrical protective device | Expired / Lapsed | 1930-05-21 | 1931-06-09 | 0 | Details |
| US1809683A | Frequency responsive apparatus | Expired / Lapsed | 1928-10-04 | 1931-06-09 | 0 | Details |
| US1809651A | Combined switch and seat operating means | Expired / Lapsed | 1927-06-27 | 1931-06-09 | 0 | Details |
| US1808543A | Automatic switching system | Expired / Lapsed | 1930-03-06 | 1931-06-02 | 0 | Details |
| US1808522A | Protective regulating means for alternating current rectifi… | Expired / Lapsed | 1928-08-29 | 1931-06-02 | 0 | Details |
| US1807441A | Resistor | Expired / Lapsed | 1928-12-28 | 1931-05-26 | 0 | Details |
| US1806199A | Method and apparatus for comparing radiant energy | Expired / Lapsed | 1928-05-03 | 1931-05-19 | 0 | Details |
| US1806197A | Method of and apparatus for comparing and recording relativ… | Expired / Lapsed | 1927-06-01 | 1931-05-19 | 0 | Details |
| US1805160A | Directional control of dynamoelectric devices | Expired / Lapsed | 1928-09-05 | 1931-05-12 | 0 | Details |
| US1805167A | Electric control system | Expired / Lapsed | 1928-06-25 | 1931-05-12 | 0 | Details |
| US1804237A | Composite metal and brazing process therefor | Expired / Lapsed | 1925-10-16 | 1931-05-05 | 0 | Details |
| US1800019A | Automatic meter-reading device | Expired / Lapsed | 1922-11-20 | 1931-04-07 | 0 | Details |
| US1799134A | Mechanical integrating device | Expired / Lapsed | 1928-11-21 | 1931-03-31 | 0 | Details |
| US1797976A | Fault-responsive apparatus | Expired / Lapsed | 1926-07-09 | 1931-03-24 | 0 | Details |
| US1795240A | Contact adjuster | Expired / Lapsed | 1929-11-16 | 1931-03-03 | 0 | Details |
| US1795176A | Capacitance connection to high-voltage lines | Expired / Lapsed | 1928-12-01 | 1931-03-03 | 0 | Details |
| US1793329A | Circuit-control apparatus | Expired / Lapsed | 1926-04-16 | 1931-02-17 | 0 | Details |
| US1792291A | Protective arrangement | Expired / Lapsed | 1929-02-19 | 1931-02-10 | 0 | Details |
| US1792340A | Circuit interrupter | Expired / Lapsed | 1928-06-14 | 1931-02-10 | 0 | Details |
| US1792264A | Transmission of pictures | Expired / Lapsed | 1928-03-26 | 1931-02-10 | 0 | Details |
| US1791446A | Electric switching device | Expired / Lapsed | 1928-01-18 | 1931-02-03 | 0 | Details |
| US1787300A | Electric-discharge device | Expired / Lapsed | 1927-11-16 | 1930-12-30 | 0 | Details |
| US1786292A | Electric socket | Expired / Lapsed | 1927-07-18 | 1930-12-23 | 0 | Details |
| US1785490A | Drive for wood-pulp grinders and the like | Expired / Lapsed | 1925-02-10 | 1930-12-16 | 0 | Details |
| US1783836A | Sewing machine | Expired / Lapsed | 1928-08-06 | 1930-12-02 | 0 | Details |
| US1783036A | Control mechanism for centrifugal compressors and method of… | Expired / Lapsed | 1928-03-22 | 1930-11-25 | 0 | Details |
| US1781561A | Electric-switch-operating mechanism | Expired / Lapsed | 1928-09-14 | 1930-11-11 | 0 | Details |
| US1780669A | Frequency-responsive signal-receiving apparatus | Expired / Lapsed | 1925-04-23 | 1930-11-04 | 0 | Details |
| US1776130A | Protection of electric circuits | Expired / Lapsed | 1928-09-19 | 1930-09-16 | 0 | Details |
| US1775525A | Adjustable support | Expired / Lapsed | 1926-08-02 | 1930-09-09 | 0 | Details |
| US1774997A | Elastic-fluid turbine and valve structure for use therewith | Expired / Lapsed | 1929-09-25 | 1930-09-02 | 0 | Details |
| US1774974A | Power plant | Expired / Lapsed | 1926-07-09 | 1930-09-02 | 0 | Details |
| US1774440A | Limit switch | Expired / Lapsed | 1928-01-18 | 1930-08-26 | 0 | Details |
| US1774459A | Compass | Expired / Lapsed | 1927-09-22 | 1930-08-26 | 0 | Details |
| US1774433A | Regulation of the color of cooked products | Expired / Lapsed | 1927-03-24 | 1930-08-26 | 0 | Details |
| US1774457A | System of illumination | Expired / Lapsed | 1927-03-18 | 1930-08-26 | 0 | Details |
| US1774421A | Receiving apparatus | Expired / Lapsed | 1924-04-25 | 1930-08-26 | 0 | Details |
| US1773613A | High-frequency communication system | Expired / Lapsed | 1927-05-19 | 1930-08-19 | 0 | Details |
| US1771919A | Auto transformer | Expired / Lapsed | 1929-11-07 | 1930-07-29 | 0 | Details |
| US1770805A | Railway signaling system | Expired / Lapsed | 1928-08-09 | 1930-07-15 | 0 | Details |
| US1770804A | Frictionless commutating mechanism | Expired / Lapsed | 1927-08-08 | 1930-07-15 | 0 | Details |
| US1769874A | Condenser and material for dielectric or insulation purposes | Expired / Lapsed | 1925-12-04 | 1930-07-01 | 0 | Details |
| US1768377A | Sound reproducing and recording device | Expired / Lapsed | 1929-01-22 | 1930-06-24 | 0 | Details |
| US1768415A | Vacuum gauge | Expired / Lapsed | 1927-04-07 | 1930-06-24 | 0 | Details |
| US1762712A | Glow-tube measuring device | Expired / Lapsed | 1925-08-10 | 1930-06-10 | 0 | Details |
| US1762811A | Electric timing device | Expired / Lapsed | 1925-08-10 | 1930-06-10 | 0 | Details |
| US1760541A | Protective arrangement | Expired / Lapsed | 1926-03-30 | 1930-05-27 | 0 | Details |
| US1760583A | Method and apparatus for treating insulated conductors | Expired / Lapsed | 1926-03-23 | 1930-05-27 | 0 | Details |
| US1758775A | Heat-dissipating device | Expired / Lapsed | 1926-03-27 | 1930-05-13 | 0 | Details |
| US1758833A | Thermoelectronic device | Expired / Lapsed | 1924-08-28 | 1930-05-13 | 0 | Details |
| US1756889A | Electron-discharge apparatus | Expired / Lapsed | 1927-12-14 | 1930-04-29 | 0 | Details |
| US1755975A | Indicator system | Expired / Lapsed | 1927-10-19 | 1930-04-22 | 0 | Details |
| US1755060A | Automatic voltage-regulating means | Expired / Lapsed | 1927-05-06 | 1930-04-15 | 0 | Details |
| US1752866A | Solenoid winding | Expired / Lapsed | 1928-12-31 | 1930-04-01 | 0 | Details |
| US1752109A | Electrical system | Expired / Lapsed | 1926-02-11 | 1930-03-25 | 0 | Details |
| US1751330A | Relay system | Expired / Lapsed | 1929-01-29 | 1930-03-18 | 0 | Details |
| US1751444A | Switch contact finger | Expired / Lapsed | 1927-01-24 | 1930-03-18 | 0 | Details |
| US1751418A | Electron-discharge apparatus | Expired / Lapsed | 1925-10-10 | 1930-03-18 | 0 | Details |
| US1748862A | Electroresponsive device | Expired / Lapsed | 1925-12-10 | 1930-02-25 | 0 | Details |
| US1747940A | Method of enameling wire | Expired / Lapsed | 1923-03-30 | 1930-02-18 | 0 | Details |
| US1747041A | Speed-indicating system | Expired / Lapsed | 1928-10-27 | 1930-02-11 | 0 | Details |
| US1747044A | Circuit-controlling apparatus | Expired / Lapsed | 1926-09-28 | 1930-02-11 | 0 | Details |
| US1746191A | Arc welding | Expired / Lapsed | 1926-06-25 | 1930-02-04 | 0 | Details |
| US1746196A | Method and apparatus for electric-arc welding | Expired / Lapsed | 1925-09-05 | 1930-02-04 | 0 | Details |
| US1746207A | Method and apparatus for electric arc welding | Expired / Lapsed | 1924-12-26 | 1930-02-04 | 0 | Details |
| US1743752A | Current transformer | Expired / Lapsed | 1928-12-01 | 1930-01-14 | 0 | Details |
| US1743792A | Telemetric transmitter | Expired / Lapsed | 1927-04-20 | 1930-01-14 | 0 | Details |
| US1743795A | Faulty-line-section cut-out | Expired / Lapsed | 1924-08-15 | 1930-01-14 | 0 | Details |
| US1742971A | Internal-combustion engine | Expired / Lapsed | 1928-12-04 | 1930-01-07 | 0 | Details |
| US1742138A | Temperature-responsive device | Expired / Lapsed | 1924-11-28 | 1929-12-31 | 0 | Details |
| US1740406A | Sound-recording apparatus | Expired / Lapsed | 1928-01-23 | 1929-12-17 | 0 | Details |
| US1740367A | Terminal connection for electric apparatus | Expired / Lapsed | 1927-12-28 | 1929-12-17 | 0 | Details |
| US1734917A | Electric discharge device | Expired / Lapsed | 1928-12-27 | 1929-11-05 | 0 | Details |
| US1732987A | Telemetric summation system | Expired / Lapsed | 1927-03-09 | 1929-10-22 | 0 | Details |
| US1731861A | Magnetic core | Expired / Lapsed | 1929-04-05 | 1929-10-15 | 0 | Details |
| US1731867A | Heat-dissipating tube for electrical apparatus casings and … | Expired / Lapsed | 1928-02-17 | 1929-10-15 | 0 | Details |
| US1731127A | Signal-control system | Expired / Lapsed | 1926-12-30 | 1929-10-08 | 0 | Details |
| US1729681A | Waterproof wrapping cloth | Expired / Lapsed | 1926-06-25 | 1929-10-01 | 0 | Details |
| US1728003A | Stroboscope | Expired / Lapsed | 1927-05-19 | 1929-09-10 | 0 | Details |
| US1725662A | Synchronous inductor frequency changer | Expired / Lapsed | 1927-12-24 | 1929-08-20 | 0 | Details |
| US1725692A | Automatic reclosing circuit-breaker system | Expired / Lapsed | 1926-08-11 | 1929-08-20 | 0 | Details |
| US1724870A | Safety device for electrical apparatus | Expired / Lapsed | 1927-02-01 | 1929-08-13 | 0 | Details |
| US1723911A | System of electrical distribution | Expired / Lapsed | 1927-11-15 | 1929-08-06 | 0 | Details |
| US1723907A | Radio receiving system | Expired / Lapsed | 1923-05-11 | 1929-08-06 | 0 | Details |
| US1721409A | Protective arrangement | Expired / Lapsed | 1927-08-31 | 1929-07-16 | 0 | Details |
| US1721367A | Tile, stoneware article, and the like | Expired / Lapsed | 1926-12-29 | 1929-07-16 | 0 | Details |
| US1721375A | Meter-testing apparatus | Expired / Lapsed | 1925-11-03 | 1929-07-16 | 0 | Details |
| US1719898A | Method of and apparatus for producing a fuel mixture of pre… | Expired / Lapsed | 1925-10-06 | 1929-07-09 | 0 | Details |
| US1718529A | Testing apparatus | Expired / Lapsed | 1928-05-01 | 1929-06-25 | 0 | Details |
| US1718478A | Electric switch | Expired / Lapsed | 1927-05-24 | 1929-06-25 | 0 | Details |
| US1718563A | Treatment of metals | Expired / Lapsed | 1925-04-17 | 1929-06-25 | 0 | Details |
| US1717191A | Time-element electroresponsive device | Expired / Lapsed | 1925-08-15 | 1929-06-11 | 0 | Details |
| US1717193A | Resistance element and method of making the same | Expired / Lapsed | 1924-04-18 | 1929-06-11 | 0 | Details |
| US1716752A | Control system | Expired / Lapsed | 1923-02-02 | 1929-06-11 | 0 | Details |
| US1712370A | Electric discharge device | Expired / Lapsed | 1926-04-27 | 1929-05-07 | 0 | Details |
| US1708003A | Welding torch | Expired / Lapsed | 1926-02-20 | 1929-04-09 | 0 | Details |
| US1708884A | Means for reproducing position | Expired / Lapsed | 1925-04-22 | 1929-04-09 | 0 | Details |
| US1706810A | Electric apparatus | Expired / Lapsed | 1925-09-23 | 1929-03-26 | 0 | Details |
| US1706169A | Control for dynamo-electric machines | Expired / Lapsed | 1927-12-10 | 1929-03-19 | 0 | Details |
| US1706161A | Illuminating unit | Expired / Lapsed | 1926-11-13 | 1929-03-19 | 0 | Details |
| US1706149A | System for transmitting angular motion | Expired / Lapsed | 1926-10-04 | 1929-03-19 | 0 | Details |
| US1706130A | Heat-resisting material | Expired / Lapsed | 1925-09-14 | 1929-03-19 | 0 | Details |
| US1706185A | Transmission of pictures and views | Expired / Lapsed | 1925-05-27 | 1929-03-19 | 0 | Details |
| US1706284A | Jack plug | Expired / Lapsed | 1924-02-21 | 1929-03-19 | 0 | Details |
| US1706158A | Electrical testing apparatus | Expired / Lapsed | 1921-11-07 | 1929-03-19 | 0 | Details |
| US1701352A | Electric switch | Expired / Lapsed | 1926-12-10 | 1929-02-05 | 0 | Details |
| US1701331A | Consistency meter | Expired / Lapsed | 1925-08-26 | 1929-02-05 | 0 | Details |
| US1701348A | Apparatus for marking glass articles | Expired / Lapsed | 1923-03-16 | 1929-02-05 | 0 | Details |
| US1698325A | Reversing motor-control system | Expired / Lapsed | 1926-05-12 | 1929-01-08 | 0 | Details |
| US1698302A | Coating method | Expired / Lapsed | 1921-04-22 | 1929-01-08 | 0 | Details |
| US1696582A | Electric-switch-operating mechanism | Expired / Lapsed | 1923-08-01 | 1928-12-25 | 0 | Details |
| US1694264A | Temperature regulator | Expired / Lapsed | 1925-06-22 | 1928-12-04 | 0 | Details |
| US1693303A | Electric terminal equipment | Expired / Lapsed | 1927-12-13 | 1928-11-27 | 0 | Details |
| US1693314A | Means for reproducing position | Expired / Lapsed | 1924-07-09 | 1928-11-27 | 0 | Details |
| US1685666A | Method and apparatus for storing alkali metals | Expired / Lapsed | 1927-08-29 | 1928-09-25 | 0 | Details |
| US1684132A | Means for reproducing position | Expired / Lapsed | 1925-11-30 | 1928-09-11 | 0 | Details |
| US1684138A | Means for reproducing position | Expired / Lapsed | 1925-09-29 | 1928-09-11 | 0 | Details |
| US1680756A | Synchronizing device | Expired / Lapsed | 1926-11-26 | 1928-08-14 | 0 | Details |
| US1680681A | Process of treating silica articles | Expired / Lapsed | 1926-01-21 | 1928-08-14 | 0 | Details |
| US1677029A | Thermoelectric generator | Expired / Lapsed | 1925-11-27 | 1928-07-10 | 0 | Details |
| US1676979A | Vibratory converter | Expired / Lapsed | 1922-08-24 | 1928-07-10 | 0 | Details |
| US1677000A | Electric discharge device | Expired / Lapsed | 1921-03-05 | 1928-07-10 | 0 | Details |
| US1674488A | Electric heating unit | Expired / Lapsed | 1922-12-20 | 1928-06-19 | 0 | Details |
| US1673624A | Treatment of metals | Expired / Lapsed | 1925-01-02 | 1928-06-12 | 0 | Details |
| US1673673A | Electrical converter | Expired / Lapsed | 1922-12-14 | 1928-06-12 | 0 | Details |
| US1672703A | Induction voltage regulator | Expired / Lapsed | 1927-09-23 | 1928-06-05 | 0 | Details |
| US1672671A | Photo-electric photometer | Expired / Lapsed | 1927-01-20 | 1928-06-05 | 0 | Details |
| US1672677A | Driving mechanism | Expired / Lapsed | 1925-07-14 | 1928-06-05 | 0 | Details |
| US1672857A | Coating for glass surfaces | Expired / Lapsed | 1922-02-27 | 1928-06-05 | 0 | Details |
| US1669154A | Protective relay | Expired / Lapsed | 1925-09-14 | 1928-05-08 | 0 | Details |
| US1669112A | Supervisory control system | Expired / Lapsed | 1924-09-15 | 1928-05-08 | 0 | Details |
| US1667618A | Soldering iron | Expired / Lapsed | 1924-01-08 | 1928-04-24 | 0 | Details |
| US1662045A | Lamp-making machine | Expired / Lapsed | 1924-04-22 | 1928-03-06 | 0 | Details |
| US1658660A | Signaling system | Expired / Lapsed | 1927-03-30 | 1928-02-07 | 0 | Details |
| US1658713A | Electrical contact | Expired / Lapsed | 1923-10-30 | 1928-02-07 | 0 | Details |
| US1658672A | Electron-discharge apparatus | Expired / Lapsed | 1923-04-02 | 1928-02-07 | 0 | Details |
| US1657249A | Capacitance transformer | Expired / Lapsed | 1927-05-27 | 1928-01-24 | 0 | Details |
| US1657253A | Connecter for electric conductors | Expired / Lapsed | 1924-09-10 | 1928-01-24 | 0 | Details |
| US1655290A | Machine for treating hollow glass articles | Expired / Lapsed | 1926-04-13 | 1928-01-03 | 0 | Details |
| US1655036A | Control of electric power | Expired / Lapsed | 1925-04-25 | 1928-01-03 | 0 | Details |
| US1652923A | Voltage regulator | Expired / Lapsed | 1926-03-17 | 1927-12-13 | 0 | Details |
| US1650632A | Electrode steam boiler | Expired / Lapsed | 1926-04-13 | 1927-11-29 | 0 | Details |
| US1650626A | System of gunfire control | Expired / Lapsed | 1924-11-29 | 1927-11-29 | 0 | Details |
| US1648680A | Electric-motor control for feed mechanisms | Expired / Lapsed | 1927-01-29 | 1927-11-08 | 0 | Details |
| US1648687A | Method and apparatus for the transmission of pictures and v… | Expired / Lapsed | 1924-09-23 | 1927-11-08 | 0 | Details |
| US1646215A | Automatic switching equipment | Expired / Lapsed | 1922-09-15 | 1927-10-18 | 0 | Details |
| US1645090A | Bushing-terminal connecter | Expired / Lapsed | 1926-10-02 | 1927-10-11 | 0 | Details |
| US1641693A | Synchronoscope | Expired / Lapsed | 1926-10-25 | 1927-09-06 | 0 | Details |
| US1641673A | Means for measuring the viscosity of fluids | Expired / Lapsed | 1925-12-09 | 1927-09-06 | 0 | Details |
| US1640433A | Insulating element | Expired / Lapsed | 1926-07-20 | 1927-08-30 | 0 | Details |
| US1637852A | Recording instrument | Expired / Lapsed | 1924-09-08 | 1927-08-02 | 0 | Details |
| US1637033A | Composite electric conductor | Expired / Lapsed | 1925-06-05 | 1927-07-26 | 0 | Details |
| US1637046A | Decorative lighting outfit | Expired / Lapsed | 1922-04-22 | 1927-07-26 | 0 | Details |
| US1635787A | Method and apparatus for the fatigue testing of material | Expired / Lapsed | 1925-03-14 | 1927-07-12 | 0 | Details |
| US1634979A | Control apparatus | Expired / Lapsed | 1925-11-10 | 1927-07-05 | 0 | Details |
| US1626449A | Automatic antenna regulation | Expired / Lapsed | 1925-12-29 | 1927-04-26 | 0 | Details |
| US1623825A | Bulb-feeding apparatus | Expired / Lapsed | 1925-03-24 | 1927-04-05 | 0 | Details |
| US1618757A | Speed regulator | Expired / Lapsed | 1925-08-26 | 1927-02-22 | 0 | Details |
| US1618800A | Indicating instrument | Expired / Lapsed | 1924-11-12 | 1927-02-22 | 0 | Details |
| US1618117A | Narrow light aperture and method of making the same | Expired / Lapsed | 1926-07-06 | 1927-02-15 | 0 | Details |
| US1617133A | Centrifugal pump and compressor | Expired / Lapsed | 1925-05-23 | 1927-02-08 | 0 | Details |
| US1617145A | Shunt | Expired / Lapsed | 1925-01-06 | 1927-02-08 | 0 | Details |
| US1617161A | Process of preparing metals | Expired / Lapsed | 1923-03-13 | 1927-02-08 | 0 | Details |
| US1615662A | Brush holder | Expired / Lapsed | 1926-03-18 | 1927-01-25 | 0 | Details |
| US1615643A | Ward-leonard drive | Expired / Lapsed | 1925-07-27 | 1927-01-25 | 0 | Details |
| US1615735A | Mirror | Expired / Lapsed | 1923-07-24 | 1927-01-25 | 0 | Details |
| US1615674A | Lens | Expired / Lapsed | 1922-10-18 | 1927-01-25 | 0 | Details |
| US1615636A | Signaling system | Expired / Lapsed | 1919-06-05 | 1927-01-25 | 0 | Details |
| US1614217A | Flow meter and the like | Expired / Lapsed | 1924-01-26 | 1927-01-11 | 0 | Details |
| US1612119A | System for the transmission of angular motion | Expired / Lapsed | 1924-11-22 | 1926-12-28 | 0 | Details |
| US1612120A | System for the transmission of angular motion | Expired / Lapsed | 1921-12-15 | 1926-12-28 | 0 | Details |
| US1612117A | System for the transmission of angular movements | Expired / Lapsed | 1921-09-15 | 1926-12-28 | 0 | Details |
| US1610779A | Signaling apparatus | Expired / Lapsed | 1918-08-27 | 1926-12-14 | 0 | Details |
| US1610179A | Flow meter and the like | Expired / Lapsed | 1923-11-20 | 1926-12-07 | 0 | Details |
| US1603058A | Transformer | Expired / Lapsed | 1926-03-23 | 1926-10-12 | 0 | Details |
| US1603210A | Temperature-responsive device | Expired / Lapsed | 1925-04-14 | 1926-10-12 | 0 | Details |
| US1601926A | Fuse holder | Expired / Lapsed | 1924-05-28 | 1926-10-05 | 0 | Details |
| US1600842A | Electrostatic apparatus | Expired / Lapsed | 1923-09-05 | 1926-09-21 | 0 | Details |
| US1600071A | Bearing for the moving elements of measuring devices and th… | Expired / Lapsed | 1925-03-17 | 1926-09-14 | 0 | Details |
| US1599245A | Electrical apparatus | Expired / Lapsed | 1923-01-20 | 1926-09-07 | 0 | Details |
| US1594061A | Corrosion-resisting metal | Expired / Lapsed | 1922-06-19 | 1926-07-27 | 0 | Details |
| US1594069A | Sound-detecting device | Expired / Lapsed | 1919-06-06 | 1926-07-27 | 0 | Details |
| US1579019A | Machine and process for preparing quartz | Expired / Lapsed | 1924-07-18 | 1926-03-30 | 0 | Details |
| US1579051A | Electric ship propulsion | Expired / Lapsed | 1920-12-11 | 1926-03-30 | 0 | Details |
| US1576195A | System for transmitting angular motion | Expired / Lapsed | 1925-09-14 | 1926-03-09 | 0 | Details |
| US1576083A | Method of refining gallium metal | Expired / Lapsed | 1925-08-12 | 1926-03-09 | 0 | Details |
| US1576155A | Electromagnet | Expired / Lapsed | 1924-05-24 | 1926-03-09 | 0 | Details |
| US1576102A | Terminal connection for electrical apparatus | Expired / Lapsed | 1922-02-14 | 1926-03-09 | 0 | Details |
| US1574648A | Signal system | Expired / Lapsed | 1922-01-28 | 1926-02-23 | 0 | Details |
| US1569845A | Ventilating apparatus | Expired / Lapsed | 1924-05-29 | 1926-01-12 | 0 | Details |
| US1568685A | Purification of highly-oxidizable metals | Expired / Lapsed | 1923-03-02 | 1926-01-05 | 0 | Details |
| US1568694A | Photo-electric device | Expired / Lapsed | 1921-04-16 | 1926-01-05 | 0 | Details |
| US1566980A | Regulator for electric heaters | Expired / Lapsed | 1924-05-07 | 1925-12-22 | 0 | Details |
| US1566995A | Oil governor | Expired / Lapsed | 1924-01-14 | 1925-12-22 | 0 | Details |
| US1566879A | Metering system | Expired / Lapsed | 1922-03-07 | 1925-12-22 | 0 | Details |
| US1564804A | Temperature-control device | Expired / Lapsed | 1925-04-16 | 1925-12-08 | 0 | Details |
| US1564788A | System for the transmission of angular motion | Expired / Lapsed | 1922-06-16 | 1925-12-08 | 0 | Details |
| US1561001A | Electric oscillator | Expired / Lapsed | 1921-02-07 | 1925-11-10 | 0 | Details |
| US1559076A | Oven | Expired / Lapsed | 1924-02-23 | 1925-10-27 | 0 | Details |
| US1559525A | Means for reproducing position | Expired / Lapsed | 1921-12-16 | 1925-10-27 | 0 | Details |
| US1559110A | Motor controller | Expired / Lapsed | 1921-04-25 | 1925-10-27 | 0 | Details |
| US1558448A | Automatic reclosing circuit-breaker system | Expired / Lapsed | 1922-08-02 | 1925-10-20 | 0 | Details |
| US1554698A | Surge preventer | Expired / Lapsed | 1923-12-22 | 1925-09-22 | 0 | Details |
| US1554674A | Control system | Expired / Lapsed | 1923-11-02 | 1925-09-22 | 0 | Details |
| US1554980A | Method of and means for calibrating instruments for the tra… | Expired / Lapsed | 1923-06-21 | 1925-09-22 | 0 | Details |
| US1554915A | Method of calibrating instruments for the transmission of a… | Expired / Lapsed | 1923-04-12 | 1925-09-22 | 0 | Details |
| US1552235A | System and apparatus for delaying response of electrorespon… | Expired / Lapsed | 1923-12-18 | 1925-09-01 | 0 | Details |
| US1551512A | Limit switch | Expired / Lapsed | 1925-02-02 | 1925-08-25 | 0 | Details |
| US1551393A | Position indicator | Expired / Lapsed | 1921-09-15 | 1925-08-25 | 0 | Details |
| US1550124A | Flow meter | Expired / Lapsed | 1924-09-05 | 1925-08-18 | 0 | Details |
| US1550157A | Progressive system of brazing | Expired / Lapsed | 1924-01-02 | 1925-08-18 | 0 | Details |
| US1550197A | Radiation projector | Expired / Lapsed | 1923-06-06 | 1925-08-18 | 0 | Details |
| US1550155A | Thermally-controlled apparatus | Expired / Lapsed | 1923-05-17 | 1925-08-18 | 0 | Details |
| US1549477A | Decreasing cross-talk in phantom circuits | Expired / Lapsed | 1923-07-02 | 1925-08-11 | 0 | Details |
| US1549456A | Electric discharge indicator | Expired / Lapsed | 1922-02-11 | 1925-08-11 | 0 | Details |
| US1548698A | Telephone transmitter and receiver, loud-speaking telephone… | Expired / Lapsed | 1924-09-10 | 1925-08-04 | 0 | Details |
| US1548799A | Electric switch | Expired / Lapsed | 1921-08-10 | 1925-08-04 | 0 | Details |
| US1547435A | Means for reproducing position | Expired / Lapsed | 1923-07-20 | 1925-07-28 | 0 | Details |
| US1547154A | Amplifying apparatus | Expired / Lapsed | 1924-08-15 | 1925-07-21 | 0 | Details |
| US1546264A | Radiation-measuring device | Expired / Lapsed | 1921-12-31 | 1925-07-14 | 0 | Details |
| US1543654A | X-ray apparatus | Expired / Lapsed | 1922-01-18 | 1925-06-23 | 0 | Details |
| US1541641A | Manufacture of laminated material from spinnable textile wo… | Expired / Lapsed | 1924-04-08 | 1925-06-09 | 0 | Details |
| US1541600A | Method of and means for operating electric furnaces | Expired / Lapsed | 1923-05-11 | 1925-06-09 | 0 | Details |
| US1541627A | X-ray apparatus | Expired / Lapsed | 1923-04-26 | 1925-06-09 | 0 | Details |
| US1537352A | Electrical apparatus | Expired / Lapsed | 1919-10-23 | 1925-05-12 | 0 | Details |
| US1535819A | Cooler and separator | Expired / Lapsed | 1922-12-26 | 1925-04-28 | 0 | Details |
| US1535019A | Metallurgical process | Expired / Lapsed | 1920-09-18 | 1925-04-21 | 0 | Details |
| US1531917A | Electric switch | Expired / Lapsed | 1922-11-11 | 1925-03-31 | 0 | Details |
| US1532002A | Composite quartz body | Expired / Lapsed | 1922-10-30 | 1925-03-31 | 0 | Details |
| US1531971A | Protective device | Expired / Lapsed | 1918-05-20 | 1925-03-31 | 0 | Details |
| US1531259A | Insulated conductor and method of making same | Expired / Lapsed | 1921-03-05 | 1925-03-24 | 0 | Details |
| US1530374A | Metal coating | Expired / Lapsed | 1922-10-12 | 1925-03-17 | 0 | Details |
| US1530249A | Turbine bucket | Expired / Lapsed | 1922-09-23 | 1925-03-17 | 0 | Details |
| US1530445A | Automatic synchronizing apparatus | Expired / Lapsed | 1922-01-04 | 1925-03-17 | 0 | Details |
| US1523778A | Electron device and method of operating | Expired / Lapsed | 1921-11-15 | 1925-01-20 | 0 | Details |
| US1518683A | Signaling system | Expired / Lapsed | 1923-11-06 | 1924-12-09 | 0 | Details |
| US1516607A | Hollow turbine bucket and method of manufacturing same | Expired / Lapsed | 1923-07-30 | 1924-11-25 | 0 | Details |
| US1512200A | Fluorescent screen | Expired / Lapsed | 1920-09-27 | 1924-10-21 | 0 | Details |
| US1511050A | Temperature regulator | Expired / Lapsed | 1922-02-20 | 1924-10-07 | 0 | Details |
| US1508707A | Control mechanism for aeroplane superchargers | Expired / Lapsed | 1922-04-08 | 1924-09-16 | 0 | Details |
| US1508689A | Metallic arc welding | Expired / Lapsed | 1921-09-23 | 1924-09-16 | 0 | Details |
| US1506443A | Temperature regulator | Expired / Lapsed | 1922-02-25 | 1924-08-26 | 0 | Details |
| US1504002A | Electrostatic condenser | Expired / Lapsed | 1920-11-13 | 1924-08-05 | 0 | Details |
| US1501886A | Gyroscopic navigation instrument | Expired / Lapsed | 1921-10-27 | 1924-07-15 | 0 | Details |
| US1501708A | Controller finger | Expired / Lapsed | 1921-10-07 | 1924-07-15 | 0 | Details |
| US1501026A | Noiseless gear and method of forming the same | Expired / Lapsed | 1923-01-10 | 1924-07-08 | 0 | Details |
| US1500860A | Electric control system | Expired / Lapsed | 1922-05-17 | 1924-07-08 | 0 | Details |
| US1501017A | Protective device | Expired / Lapsed | 1919-11-28 | 1924-07-08 | 0 | Details |
| US1498908A | Evacuated container | Expired / Lapsed | 1915-01-23 | 1924-06-24 | 0 | Details |
| US1494940A | Electric heating unit | Expired / Lapsed | 1922-10-17 | 1924-05-20 | 0 | Details |
| US1494939A | Electric heater | Expired / Lapsed | 1922-09-23 | 1924-05-20 | 0 | Details |
| US1493306A | Quick-release valve coupling | Expired / Lapsed | 1921-03-17 | 1924-05-06 | 0 | Details |
| US1491376A | Internal-combustion engine | Expired / Lapsed | 1922-05-03 | 1924-04-22 | 0 | Details |
| US1491372A | Radio receiving system | Expired / Lapsed | 1921-10-28 | 1924-04-22 | 0 | Details |
| US1485727A | Voltage boosting or bucking system | Expired / Lapsed | 1920-09-20 | 1924-03-04 | 0 | Details |
| US1483433A | Relay | Expired / Lapsed | 1921-09-24 | 1924-02-12 | 0 | Details |
| US1479663A | Relay and the like | Expired / Lapsed | 1920-02-16 | 1924-01-01 | 0 | Details |
| US1477360A | Elastic-fluid turbine | Expired / Lapsed | 1921-01-15 | 1923-12-11 | 0 | Details |
| US1477367A | Electric register | Expired / Lapsed | 1920-03-01 | 1923-12-11 | 0 | Details |
| US1475583A | Variable-current generator | Expired / Lapsed | 1921-05-20 | 1923-11-27 | 0 | Details |
| US1470506A | Method of manufacturing turbine elements | Expired / Lapsed | 1921-12-23 | 1923-10-09 | 0 | Details |
| US1469075A | Electron-discharge apparatus | Expired / Lapsed | 1921-03-23 | 1923-09-25 | 0 | Details |
| US1466293A | Rheostat | Expired / Lapsed | 1921-12-27 | 1923-08-28 | 0 | Details |
| US1463504A | Printing machine | Expired / Lapsed | 1920-10-04 | 1923-07-31 | 0 | Details |
| US1462350A | Electric steam boiler | Expired / Lapsed | 1922-02-15 | 1923-07-17 | 0 | Details |
| US1450464A | Crystal formation | Expired / Lapsed | 1920-07-26 | 1923-04-03 | 0 | Details |
| US1444438A | Electrode structure | Expired / Lapsed | 1918-08-07 | 1923-02-06 | 0 | Details |
| US1441532A | Electrical apparatus | Expired / Lapsed | 1920-07-01 | 1923-01-09 | 0 | Details |
| US1426921A | Electrical apparatus | Expired / Lapsed | 1919-05-06 | 1922-08-22 | 0 | Details |
| US1424027A | Electromagnetic clutch and reversing mechanism | Expired / Lapsed | 1920-01-15 | 1922-07-25 | 0 | Details |
| US1415556A | Gearing | Expired / Lapsed | 1920-04-09 | 1922-05-09 | 0 | Details |
| US1415528A | Recording instrument | Expired / Lapsed | 1919-10-17 | 1922-05-09 | 0 | Details |
| US1415499A | Recorder | Expired / Lapsed | 1919-10-13 | 1922-05-09 | 0 | Details |
| US1412782A | Stationary induction apparatus | Expired / Lapsed | 1921-01-26 | 1922-04-11 | 0 | Details |
| US1411619A | Electrical apparatus | Expired / Lapsed | 1919-12-10 | 1922-04-04 | 0 | Details |
| US1408041A | Shaft coupling | Expired / Lapsed | 1918-12-06 | 1922-02-28 | 0 | Details |
| US1406507A | Recorder | Expired / Lapsed | 1919-09-09 | 1922-02-14 | 0 | Details |
| US1394910A | Reactor in tanks | Expired / Lapsed | 1920-02-03 | 1921-10-25 | 0 | Details |
| US1394937A | Resistance unit | Expired / Lapsed | 1919-03-28 | 1921-10-25 | 0 | Details |
| US1394187A | Resistor | Expired / Lapsed | 1920-03-15 | 1921-10-18 | 0 | Details |
| US1394144A | Incandescent-cathode apparatus | Expired / Lapsed | 1919-10-24 | 1921-10-18 | 0 | Details |
| US1390243A | Method of welding low-melting-point metals and alloys to hi… | Expired / Lapsed | 1919-09-15 | 1921-09-06 | 0 | Details |
| US1385873A | Electron-discharge apparatus | Expired / Lapsed | 1916-06-05 | 1921-07-26 | 0 | Details |
| US1380981A | Telephone | Expired / Lapsed | 1917-04-21 | 1921-06-07 | 0 | Details |
| US1379526A | Temperature-indicator for transformers and the like | Expired / Lapsed | 1918-05-25 | 1921-05-24 | 0 | Details |
| US1362437A | Elastic-fluid turbine | Expired / Lapsed | 1920-04-14 | 1920-12-14 | 0 | Details |
| US1357710A | Method of and apparatus for automatically removing gases | Expired / Lapsed | 1918-11-29 | 1920-11-02 | 0 | Details |
| US1353656A | Fluid-operated motor | Expired / Lapsed | 1920-02-24 | 1920-09-21 | 0 | Details |
| US1350899A | Electrical system of power transmission | Expired / Lapsed | 1918-11-15 | 1920-08-24 | 0 | Details |
| US1330563A | Welding-electrode | Expired / Lapsed | 1919-09-06 | 1920-02-10 | 0 | Details |
| US1323778A | Electrically-operated fuel-valve. | Expired / Lapsed | 1918-03-02 | 1919-12-02 | 0 | Details |
| US1301636A | High-voltage-current transformer. | Expired / Lapsed | 1916-10-28 | 1919-04-22 | 0 | Details |
| US1301079A | Incandescent lamp. | Expired / Lapsed | 1918-06-15 | 1919-04-15 | 0 | Details |
| US1300068A | Welding-electrode. | Expired / Lapsed | 1918-05-07 | 1919-04-08 | 0 | Details |
| US1297929A | Differentially-connected exploring-coils. | Expired / Lapsed | 1915-09-28 | 1919-03-18 | 0 | Details |
| US1297188A | System for amplifying variable currents. | Expired / Lapsed | 1915-03-02 | 1919-03-11 | 0 | Details |
| US1291106A | Electrical resistance. | Expired / Lapsed | 1917-11-21 | 1919-01-14 | 0 | Details |
| US1291056A | Flow-meter. | Expired / Lapsed | 1916-08-10 | 1919-01-14 | 0 | Details |
| US1289823A | Electric-discharge-controlling device and method of operati… | Expired / Lapsed | 1914-11-06 | 1918-12-31 | 0 | Details |
| US1287244A | Electric protective device. | Expired / Lapsed | 1914-11-10 | 1918-12-10 | 0 | Details |
| US1280892A | Method of manufacturing elastic helical gear-wheel. | Expired / Lapsed | 1917-11-09 | 1918-10-08 | 0 | Details |
| US1281216A | Method of and means for preventing pulsations in centrifuga… | Expired / Lapsed | 1917-02-02 | 1918-10-08 | 0 | Details |
| US1279360A | Motor-control system. | Expired / Lapsed | 1918-03-16 | 1918-09-17 | 0 | Details |
| US1276589A | Thermoregulator. | Expired / Lapsed | 1917-06-26 | 1918-08-20 | 0 | Details |
| US1273661A | Interlocking control for mine-hoists. | Expired / Lapsed | 1918-03-25 | 1918-07-23 | 0 | Details |
| US1273719A | Control of electric circuits. | Expired / Lapsed | 1917-11-07 | 1918-07-23 | 0 | Details |
| US1273346A | Manufacture of glass rods and tubes. | Expired / Lapsed | 1916-07-20 | 1918-07-23 | 0 | Details |
| US1271981A | Socket and plug device. | Expired / Lapsed | 1914-03-11 | 1918-07-09 | 0 | Details |
| US1271407A | Protective device. | Expired / Lapsed | 1915-01-11 | 1918-07-02 | 0 | Details |
| US1269481A | Protective device. | Expired / Lapsed | 1916-08-01 | 1918-06-11 | 0 | Details |
| US1269537A | Dynamo-electric machine. | Expired / Lapsed | 1916-01-08 | 1918-06-11 | 0 | Details |
| US1267880A | Centrifugal compressor. | Expired / Lapsed | — | 1918-05-28 | 0 | Details |
| US1267214A | Position indicator or recorder. | Expired / Lapsed | 1916-06-15 | 1918-05-21 | 0 | Details |
| US1267199A | Incandescent-cathode arc device. | Expired / Lapsed | 1915-09-20 | 1918-05-21 | 0 | Details |
| US1257106A | Electric heating device. | Expired / Lapsed | 1914-07-23 | 1918-02-19 | 0 | Details |
| US1255667A | High-potential insulator. | Expired / Lapsed | 1913-01-09 | 1918-02-05 | 0 | Details |
| US1253166A | Electrical winding. | Expired / Lapsed | 1917-03-27 | 1918-01-08 | 0 | Details |
| US1251377A | Method of and means for obtaining constant direct-current p… | Expired / Lapsed | 1915-12-22 | 1917-12-25 | 0 | Details |
| US1244217A | Electron-discharge apparatus and method of operating the sa… | Expired / Lapsed | 1915-10-28 | 1917-10-23 | 0 | Details |
| US1235373A | Protection of electrical apparatus. | Expired / Lapsed | 1914-11-30 | 1917-07-31 | 0 | Details |
| US1233807A | Method of making insulated wires. | Expired / Lapsed | 1914-01-03 | 1917-07-17 | 0 | Details |
| US1230004A | Incandescent cathode device. | Expired / Lapsed | 1915-09-18 | 1917-06-12 | 0 | Details |
| US1226470A | Refractory-metal tube. | Expired / Lapsed | 1915-02-20 | 1917-05-15 | 0 | Details |
| US1216237A | Controlling means for engine-generator-driven vehicles. | Expired / Lapsed | 1914-06-24 | 1917-02-13 | 0 | Details |
| US1213844A | Protective device. | Expired / Lapsed | 1912-05-02 | 1917-01-30 | 0 | Details |
| US1208448A | Electric cut-out. | Expired / Lapsed | 1914-02-26 | 1916-12-12 | 0 | Details |
| US1200233A | Electrical apparatus. | Expired / Lapsed | 1914-12-30 | 1916-10-03 | 0 | Details |
| US1197615A | Compound metal. | Expired / Lapsed | 1913-09-18 | 1916-09-12 | 0 | Details |
| US1192775A | Combined turbine and vapor generator. | Expired / Lapsed | 1915-11-30 | 1916-07-25 | 0 | Details |
| US1192706A | X-ray tube. | Expired / Lapsed | 1914-09-14 | 1916-07-25 | 0 | Details |
| US1190060A | Electric switch. | Expired / Lapsed | 1913-06-04 | 1916-07-04 | 0 | Details |
| US1189194A | Process of making clad metals. | Expired / Lapsed | 1909-02-11 | 1916-06-27 | 0 | Details |
| US1188202A | Hoisting equipment. | Expired / Lapsed | 1915-03-05 | 1916-06-20 | 0 | Details |
| US1174787A | Fluid-flow meter. | Expired / Lapsed | 1912-11-04 | 1916-03-07 | 0 | Details |
| US1168050A | Wire-drawing. | Expired / Lapsed | 1912-12-07 | 1916-01-11 | 0 | Details |
| US1163329A | Filament for incandescent electric lamps. | Expired / Lapsed | 1907-05-31 | 1915-12-07 | 0 | Details |
| US1159189A | Vibrating rectifier. | Expired / Lapsed | 1912-06-03 | 1915-11-02 | 0 | Details |
| US1157731A | Electric cooking apparatus. | Expired / Lapsed | 1914-04-04 | 1915-10-26 | 0 | Details |
| US1156630A | Method of and means for measuring the flow of fluids. | Expired / Lapsed | 1915-04-29 | 1915-10-12 | 0 | Details |
| US1156660A | Method and apparatus for measuring the flow of fluids. | Expired / Lapsed | 1914-04-22 | 1915-10-12 | 0 | Details |
| US1156638A | Flow-meter. | Expired / Lapsed | 1914-01-13 | 1915-10-12 | 0 | Details |
| US1156696A | Electrode. | Expired / Lapsed | 1913-06-28 | 1915-10-12 | 0 | Details |
| US1156496A | Process for annealing magnetic material. | Expired / Lapsed | 1912-09-14 | 1915-10-12 | 0 | Details |
| US1156491A | Frequency-indicator. | Expired / Lapsed | 1912-07-13 | 1915-10-12 | 0 | Details |
| US1156503A | Steam-flow meter. | Expired / Lapsed | 1912-01-24 | 1915-10-12 | 0 | Details |
| US1154594A | Regulating device for mixed-pressure turbo-compressors. | Expired / Lapsed | 1914-07-23 | 1915-09-21 | 0 | Details |
| US1154081A | Leading-in conductor. | Expired / Lapsed | 1912-05-14 | 1915-09-21 | 0 | Details |
| US1154591A | Automatic feed-water regulator. | Expired / Lapsed | 1912-02-12 | 1915-09-21 | 0 | Details |
| US1144029A | Protective device. | Expired / Lapsed | 1914-01-05 | 1915-06-22 | 0 | Details |
| US1132281A | Reactive coil. | Expired / Lapsed | — | 1915-03-16 | 0 | Details |
| US1130177A | Centrifugal governor. | Expired / Lapsed | 1911-12-27 | 1915-03-02 | 0 | Details |
| US1128081A | Electric heating device. | Expired / Lapsed | 1912-06-15 | 1915-02-09 | 0 | Details |
| US1128008A | Alternating-current indicator. | Expired / Lapsed | 1909-07-12 | 1915-02-09 | 0 | Details |
| US1121979A | Thermo-electric regulator. | Expired / Lapsed | 1913-10-15 | 1914-12-22 | 0 | Details |
| US1121960A | Molded metallic article and method of making the same. | Expired / Lapsed | 1910-10-12 | 1914-12-22 | 0 | Details |
| US1119713A | Centrifugal air-compressor. | Expired / Lapsed | 1910-08-17 | 1914-12-01 | 0 | Details |
| US1118446A | Insulating-coil. | Expired / Lapsed | 1912-09-17 | 1914-11-24 | 0 | Details |
| US1114564A | Cooling device for revolving motors. | Expired / Lapsed | 1912-01-31 | 1914-10-20 | 0 | Details |
| US1110029A | High-frequency alternator. | Expired / Lapsed | 1912-12-07 | 1914-09-08 | 0 | Details |
| US1109235A | Control system. | Expired / Lapsed | — | 1914-09-01 | 0 | Details |
| US1102116A | Dynamo-electric machine. | Expired / Lapsed | 1913-04-26 | 1914-06-30 | 0 | Details |
| US1101821A | Electric heating device. | Expired / Lapsed | 1912-06-07 | 1914-06-30 | 0 | Details |
| US1100708A | Electric-current shunt. | Expired / Lapsed | 1912-11-04 | 1914-06-23 | 0 | Details |
| US1097259A | Preventing pulsations in centrifugal compressors. | Expired / Lapsed | 1913-09-11 | 1914-05-19 | 0 | Details |
| US1096942A | Acceleration-indicator. | Expired / Lapsed | 1906-04-02 | 1914-05-19 | 0 | Details |
| US1096142A | Ethereal-wave-responsive device. | Expired / Lapsed | 1912-11-09 | 1914-05-12 | 0 | Details |
| US1095463A | Apparatus for removing air from water. | Expired / Lapsed | 1910-01-14 | 1914-05-05 | 0 | Details |
| US1094733A | Electric regulator. | Expired / Lapsed | — | 1914-04-28 | 0 | Details |
| US1091563A | Vapor electric apparatus. | Expired / Lapsed | 1904-04-04 | 1914-03-31 | 0 | Details |
| US1088909A | Metallurgical method. | Expired / Lapsed | 1910-06-10 | 1914-03-03 | 0 | Details |
| US1082933A | Tungsten and method of making the same for use as filaments… | Expired / Lapsed | 1912-06-19 | 1913-12-30 | 0 | Details |
| US1077818A | Detector for printing-presses or the like. | Expired / Lapsed | 1912-07-05 | 1913-11-04 | 0 | Details |
| US1064665A | Gas-turbine. | Expired / Lapsed | 1904-12-31 | 1913-06-10 | 0 | Details |
| US1060718A | Electric heater. | Expired / Lapsed | 1912-09-07 | 1913-05-06 | 0 | Details |
| US1046043A | Method and apparatus for reducing chemical compounds. | Expired / Lapsed | 1909-10-27 | 1912-12-03 | 0 | Details |
| US1042693A | Motor-control system. | Expired / Lapsed | 1912-06-03 | 1912-10-29 | 0 | Details |
| US1041485A | Leakage-reducing device. | Expired / Lapsed | 1911-04-29 | 1912-10-15 | 0 | Details |
| US1041210A | Amplifying current variations. | Expired / Lapsed | 1907-11-26 | 1912-10-15 | 0 | Details |
| US1041512A | Combined step and guide bearing for turbines. | Expired / Lapsed | 1907-03-06 | 1912-10-15 | 0 | Details |
| US1031710A | Process of connecting filaments and feed-wires for electric… | Expired / Lapsed | 1909-08-28 | 1912-07-09 | 0 | Details |
| US1028092A | Fixture for vacuum-tube lamps. | Expired / Lapsed | 1907-02-26 | 1912-05-28 | 0 | Details |
| US1026429A | Refractory conductor. | Expired / Lapsed | 1910-12-08 | 1912-05-14 | 0 | Details |
| US1025809A | Fluid-flow measuring or regulating device. | Expired / Lapsed | 1910-09-08 | 1912-05-07 | 0 | Details |
| US1022001A | Electrically-controlled brake. | Expired / Lapsed | 1908-10-16 | 1912-04-02 | 0 | Details |
| US1021256A | Resistance. | Expired / Lapsed | 1910-01-07 | 1912-03-26 | 0 | Details |
| US1020701A | Centrifugal pump for abstracting air and water from surface… | Expired / Lapsed | 1909-09-02 | 1912-03-19 | 0 | Details |
| US1019568A | Method of making resistance material. | Expired / Lapsed | — | 1912-03-05 | 0 | Details |
| US1019432A | Oscillograph. | Expired / Lapsed | 1910-04-04 | 1912-03-05 | 0 | Details |
| US1019467A | Controller for electric circuits. | Expired / Lapsed | 1909-03-15 | 1912-03-05 | 0 | Details |
| US1017571A | Governor. | Expired / Lapsed | 1910-06-29 | 1912-02-13 | 0 | Details |
| US1017509A | Governing mechanism for centrifugal apparatus. | Expired / Lapsed | 1909-05-20 | 1912-02-13 | 0 | Details |
| US1008588A | Filament. | Expired / Lapsed | 1906-08-01 | 1911-11-14 | 0 | Details |
| US1003416A | Regulator. | Expired / Lapsed | 1907-09-13 | 1911-09-19 | 0 | Details |
| US1001710A | System of electrical distribution. | Expired / Lapsed | 1905-03-11 | 1911-08-29 | 0 | Details |
| US996384A | Driving-wheel. | Expired / Lapsed | 1909-01-11 | 1911-06-27 | 0 | Details |
| US996334A | Driving dynamos from variable and non-variable sources of p… | Expired / Lapsed | 1908-08-05 | 1911-06-27 | 0 | Details |
| US994010A | Method of and apparatus for producing exhausted vessels. | Expired / Lapsed | 1910-10-22 | 1911-05-30 | 0 | Details |
| US982165A | Bearing and bearing-box. | Expired / Lapsed | 1904-11-04 | 1911-01-17 | 0 | Details |
| US980282A | Leakage-reducing device for steam-turbines. | Expired / Lapsed | 1909-07-26 | 1911-01-03 | 0 | Details |
| US980505A | Apparatus for utilizing solar heat. | Expired / Lapsed | 1909-06-01 | 1911-01-03 | 0 | Details |
| US974161A | Heating system. | Expired / Lapsed | 1910-05-10 | 1910-11-01 | 0 | Details |
| US957242A | Dynamo-electric machine. | Expired / Lapsed | 1908-04-13 | 1910-05-10 | 0 | Details |
| US953393A | Resistance unit. | Expired / Lapsed | 1908-12-09 | 1910-03-29 | 0 | Details |
| US940151A | Resistance unit. | Expired / Lapsed | 1906-10-03 | 1909-11-16 | 0 | Details |
| US929371A | Asymmetric cell. | Expired / Lapsed | 1908-03-18 | 1909-07-27 | 0 | Details |
| US925165A | Condenser. | Expired / Lapsed | 1905-08-07 | 1909-06-15 | 0 | Details |
| US922556A | Insulating-joint. | Expired / Lapsed | 1908-09-28 | 1909-05-25 | 0 | Details |
| US916905A | Carbon, filament, and method of making the same. | Expired / Lapsed | 1905-02-02 | 1909-03-30 | 0 | Details |
| US913521A | Multiplex telephony. | Expired / Lapsed | 1905-05-27 | 1909-02-23 | 0 | Details |
| US912181A | Measuring instrument. | Expired / Lapsed | — | 1909-02-09 | 0 | Details |
| US910682A | Electric heater. | Expired / Lapsed | 1908-07-09 | 1909-01-26 | 0 | Details |
| US910760A | Deflector for electric fans. | Expired / Lapsed | 1904-10-10 | 1909-01-26 | 0 | Details |
| US905478A | Incandescent lamp. | Expired / Lapsed | 1905-06-07 | 1908-12-01 | 0 | Details |
| US904808A | Insulating material. | Expired / Lapsed | 1907-08-07 | 1908-11-24 | 0 | Details |
| US903826A | Manufacture of metal-filament lamps. | Expired / Lapsed | 1907-03-16 | 1908-11-17 | 0 | Details |
| US904097A | Connector. | Expired / Lapsed | 1904-11-12 | 1908-11-17 | 0 | Details |
| US901450A | Multistage centrifugal pump. | Expired / Lapsed | 1907-01-23 | 1908-10-20 | 0 | Details |
| US897497A | Starting and speed-regulating rheostat. | Expired / Lapsed | 1908-01-25 | 1908-09-01 | 0 | Details |
| US895965A | Regulation of dynamo-electric machines. | Expired / Lapsed | 1905-09-28 | 1908-08-11 | 0 | Details |
| US894644A | Busline coupling-socket. | Expired / Lapsed | 1904-10-01 | 1908-07-28 | 0 | Details |
| US891339A | Railway-signal. | Expired / Lapsed | 1907-12-11 | 1908-06-23 | 0 | Details |
| US888381A | Electric heating device. | Expired / Lapsed | 1907-09-18 | 1908-05-19 | 0 | Details |
| US885688A | Relay. | Expired / Lapsed | 1907-08-24 | 1908-04-21 | 0 | Details |
| US884540A | Electric heater. | Expired / Lapsed | 1906-10-13 | 1908-04-14 | 0 | Details |
| US883888A | Air or gas compressor system. | Expired / Lapsed | 1907-04-10 | 1908-04-07 | 0 | Details |
| US883944A | Electric lighting. | Expired / Lapsed | 1904-12-08 | 1908-04-07 | 0 | Details |
| US883928A | Valve for air-compressors. | Expired / Lapsed | 1900-10-29 | 1908-04-07 | 0 | Details |
| US882607A | Magnetic clutch. | Expired / Lapsed | 1906-09-18 | 1908-03-24 | 0 | Details |
| US872366A | Packing for shafts of rotary steam-engines. | Expired / Lapsed | 1905-08-07 | 1907-12-03 | 0 | Details |
| US863781A | Gear-pump. | Expired / Lapsed | 1905-01-19 | 1907-08-20 | 0 | Details |
| US860997A | Lightning-arrester. | Expired / Lapsed | 1900-12-28 | 1907-07-23 | 0 | Details |
| US855471A | Insulating-stud and method of making the same. | Expired / Lapsed | 1906-08-01 | 1907-06-04 | 0 | Details |
| US854774A | High-voltage transformer. | Expired / Lapsed | 1906-10-10 | 1907-05-28 | 0 | Details |
| US853784A | Resistance unit. | Expired / Lapsed | 1906-09-22 | 1907-05-14 | 0 | Details |
| US851811A | Automatic motor-starter. | Expired / Lapsed | 1906-05-25 | 1907-04-30 | 0 | Details |
| US846795A | Shaft-bearing. | Expired / Lapsed | 1905-09-30 | 1907-03-12 | 0 | Details |
| US845236A | Cut-out. | Expired / Lapsed | 1904-05-02 | 1907-02-26 | 0 | Details |
| US843746A | Selective transmitting system. | Expired / Lapsed | 1901-12-09 | 1907-02-12 | 0 | Details |
| US843763A | Connector or terminal for electrical conductors. | Expired / Lapsed | 1901-09-11 | 1907-02-12 | 0 | Details |
| US840150A | Transformer. | Expired / Lapsed | 1901-12-16 | 1907-01-01 | 0 | Details |
| US835362A | Operating bulkhead-doors. | Expired / Lapsed | 1906-01-19 | 1906-11-06 | 0 | Details |
| US835322A | Electric measuring instrument. | Expired / Lapsed | 1904-05-24 | 1906-11-06 | 0 | Details |
| US831404A | Controlling-switch. | Expired / Lapsed | 1905-02-23 | 1906-09-18 | 0 | Details |
| US812880A | Switch or circuit-breaker for high-potential circuits. | Expired / Lapsed | 1899-12-30 | 1906-02-20 | 0 | Details |
| US811642A | Hydraulic shaft-packing for turbines. | Expired / Lapsed | 1904-07-20 | 1906-02-06 | 0 | Details |
| US806752A | Combined alternating and direct current control apparatus. | Expired / Lapsed | 1905-05-08 | 1905-12-05 | 0 | Details |
| US799809A | Nozzle for elastic-fluid turbines. | Expired / Lapsed | 1905-03-06 | 1905-09-19 | 0 | Details |
| US799377A | Cut-out for electric heaters. | Expired / Lapsed | 1904-12-01 | 1905-09-12 | 0 | Details |
| US798391A | Motor-driven machine-tool. | Expired / Lapsed | 1903-04-09 | 1905-08-29 | 0 | Details |
| US794983A | Rheostat. | Expired / Lapsed | 1903-11-23 | 1905-07-18 | 0 | Details |
| US792638A | Artificial resistance. | Expired / Lapsed | 1901-11-16 | 1905-06-20 | 0 | Details |
| US789515A | Leading-in conductor. | Expired / Lapsed | 1904-09-14 | 1905-05-09 | 0 | Details |
| US787302A | Single-phase dynamo-electric machine. | Expired / Lapsed | 1904-08-30 | 1905-04-11 | 0 | Details |
| US783546A | Insulation for edgewise-wound coils. | Expired / Lapsed | 1904-07-21 | 1905-02-28 | 0 | Details |
| US783153A | Packing and means for taking up thrust in turbines. | Expired / Lapsed | 1904-12-07 | 1905-02-21 | 0 | Details |
| US777839A | Motor-starter. | Expired / Lapsed | 1904-05-12 | 1904-12-20 | 0 | Details |
| US770040A | Motor-control system. | Expired / Lapsed | 1903-04-18 | 1904-09-13 | 0 | Details |
| US769646A | Connection-box. | Expired / Lapsed | 1903-02-20 | 1904-09-06 | 0 | Details |
| US755766A | Transformer. | Expired / Lapsed | 1902-09-29 | 1904-03-29 | 0 | Details |
| US739572A | System of motor control. | Expired / Lapsed | 1900-06-15 | 1903-09-22 | 0 | Details |
| US735621A | Electrostatic motor. | Expired / Lapsed | 1901-03-25 | 1903-08-04 | 0 | Details |
| US729269A | Transmission of power. | Expired / Lapsed | 1901-02-07 | 1903-05-26 | 0 | Details |
| US724611A | Controlling device for electric motors. | Expired / Lapsed | 1898-08-13 | 1903-04-07 | 0 | Details |
| US718083A | Generating alternating currents. | Expired / Lapsed | 1896-06-22 | 1903-01-13 | 0 | Details |
| US716131A | Electric regulator. | Expired / Lapsed | 1902-03-24 | 1902-12-16 | 0 | Details |
| US715545A | Generating alternating currents. | Expired / Lapsed | 1896-06-22 | 1902-12-09 | 0 | Details |
| US714934A | Means for preventing breakdown of high-potential windings. | Expired / Lapsed | 1902-04-26 | 1902-12-02 | 0 | Details |
| US714786A | Controlling electric motor. | Expired / Lapsed | 1900-09-26 | 1902-12-02 | 0 | Details |
| US706554A | Speed-indicating system. | Expired / Lapsed | 1901-11-29 | 1902-08-12 | 0 | Details |
| US706575A | Multirate-metering system. | Expired / Lapsed | 1901-01-31 | 1902-08-12 | 0 | Details |
| US701937A | Indicating instrument. | Expired / Lapsed | 1899-11-20 | 1902-06-10 | 0 | Details |
| US701958A | Automatic cut-out. | Expired / Lapsed | 1899-03-06 | 1902-06-10 | 0 | Details |
| US677308A | Alternating-current motor. | Expired / Lapsed | 1901-01-24 | 1901-06-25 | 0 | Details |
| US665998A | Acceleration limiting and recording device. | Expired / Lapsed | 1900-09-29 | 1901-01-15 | 0 | Details |
| US660801A | Electrically-operated-machine-tool. | Expired / Lapsed | 1900-08-30 | 1900-10-30 | 0 | Details |
| US654130A | Electric steering-gear. | Expired / Lapsed | 1899-03-20 | 1900-07-24 | 0 | Details |
| US649008A | Frequency-indicator. | Expired / Lapsed | 1899-12-09 | 1900-05-08 | 0 | Details |
| US634937A | Speed-indicator. | Expired / Lapsed | 1899-08-07 | 1899-10-17 | 0 | Details |
| US634965A | Electrical measuring instrument. | Expired / Lapsed | 1897-12-31 | 1899-10-17 | 0 | Details |