Unisys Corp
Unisys CorActive Patents
0
Total Holdings
1343
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| EP0178642A2 | Power control network for multiple digital modules | Expired / Lapsed | 1985-10-16 | — | 17 | Details |
| EP0092707A2 | Optical storage system employing a novel multi-layer optica… | Expired / Lapsed | 1983-04-07 | — | 19 | Details |
| EP0079689A2 | Global positioning system receiver | Expired / Lapsed | 1982-10-20 | — | 9 | Details |
| EP0018157A1 | High storage density disc file | Expired / Lapsed | 1980-04-09 | — | 10 | Details |
| DE3003398A1 | Computer-controlled connecting union for fluids - consists … | Expired / Lapsed | 1980-01-31 | — | 0 | Details |
| GB2020037A | Apparatus for and method of compensation for errors in theh… | Expired / Lapsed | 1979-04-27 | — | 0 | Details |
| DE2129700A1 | Arrangement for the emission of pulsed electromagnetic ener… | Expired / Lapsed | 1971-06-15 | — | 0 | Details |
| GB1003641A | Computer input-output system | Expired / Lapsed | 1962-07-12 | — | 0 | Details |
| GB749836A | Electronic system for computing and otherwise handling info… | Expired / Lapsed | 1953-03-30 | — | 0 | Details |
| GB736144A | Binary automatic computer | Expired / Lapsed | 1951-08-15 | — | 0 | Details |
| GB560834A | Improvements in or relating to machines for perforating sta… | Expired / Lapsed | 1942-10-16 | — | 0 | Details |
| US6301245B1 | Universal Messaging system providing integrated voice, data… | Expired / Lapsed | 1998-06-09 | 2001-10-09 | 11 | Details |
| US6000010A | Method of increasing the storage capacity of a level five R… | Expired / Lapsed | 1997-05-09 | 1999-12-07 | 11 | Details |
| US5083299A | Tester for measuring signal propagation delay through elect… | Expired / Lapsed | 1990-07-16 | 1992-01-21 | 13 | Details |
| US5030128A | Docking module | Expired / Lapsed | 1989-03-06 | 1991-07-09 | 13 | Details |
| US4949149A | Semicustom chip whose logic cells have narrow tops and wide… | Expired / Lapsed | 1987-03-31 | 1990-08-14 | 15 | Details |
| US4886158A | Modular center drive conveyor belt | Expired / Lapsed | 1988-11-23 | 1989-12-12 | 12 | Details |
| US4838637A | Integrated solid state non-volatile fiber optic switchboard | Expired / Lapsed | 1987-05-04 | 1989-06-13 | 24 | Details |
| US4780570A | EMI/RFI shielding for electronic assemblies | Expired / Lapsed | 1987-03-30 | 1988-10-25 | 5 | Details |
| US4696061A | Acousto-optic R-F receiver which is tunable and has adjusta… | Expired / Lapsed | 1986-09-22 | 1987-09-22 | 12 | Details |
| US4688041A | Baseband detector with anti-jam capability | Expired / Lapsed | 1981-10-08 | 1987-08-18 | 6 | Details |
| US4665536A | Programmable automatic power-off system for a digital termi… | Expired / Lapsed | 1986-03-10 | 1987-05-12 | 16 | Details |
| US4656484A | Radar reflector and scanner with electromagnetic programmab… | Expired / Lapsed | 1985-08-05 | 1987-04-07 | 8 | Details |
| US4636636A | Microwatt battery powered optical sensor | Expired / Lapsed | 1984-07-13 | 1987-01-13 | 7 | Details |
| USD287724S | Modular computer system | Expired / Lapsed | 1984-05-09 | 1987-01-13 | 1 | Details |
| US4629178A | Document conveyor system | Expired / Lapsed | 1984-03-27 | 1986-12-16 | 45 | Details |
| US4622659A | Focus detection and control apparatus for maintaining accur… | Expired / Lapsed | 1982-09-09 | 1986-11-11 | 12 | Details |
| US4620813A | Position retaining mechanism | Expired / Lapsed | 1984-10-09 | 1986-11-04 | 6 | Details |
| US4588944A | Fully scan-set testable embedded edge-triggered dual D and … | Expired / Lapsed | 1983-06-13 | 1986-05-13 | 12 | Details |
| US4572250A | Ribbon cable wire end forming tool | Expired / Lapsed | 1985-05-23 | 1986-02-25 | 29 | Details |
| US4564757A | Mirror position sensor for improved track selection in opti… | Expired / Lapsed | 1982-09-30 | 1986-01-14 | 21 | Details |
| US4544882A | Apparatus for testing an integrated circuit chip without co… | Expired / Lapsed | 1982-12-07 | 1985-10-01 | 12 | Details |
| US4538241A | Address translation buffer | Expired / Lapsed | 1983-07-14 | 1985-08-27 | 10 | Details |
| US4530551A | Circuit change pin for printed wiring board | Expired / Lapsed | 1984-01-12 | 1985-07-23 | 5 | Details |
| US4516837A | Electro-optical switch for unpolarized optical signals | Expired / Lapsed | 1983-02-22 | 1985-05-14 | 24 | Details |
| US4494192A | High speed bus architecture | Expired / Lapsed | 1982-07-21 | 1985-01-15 | 23 | Details |
| US4494226A | Three beam optical memory system | Expired / Lapsed | 1981-10-15 | 1985-01-15 | 17 | Details |
| US4489406A | Optical memory system having a short seek capability | Expired / Lapsed | 1982-02-17 | 1984-12-18 | 9 | Details |
| US4470048A | Range profile target classifier | Expired / Lapsed | 1982-03-29 | 1984-09-04 | 15 | Details |
| US4443799A | Spread spectrum radar | Expired / Lapsed | 1981-07-02 | 1984-04-17 | 11 | Details |
| US4435822A | Coherent spread spectrum receiving apparatus | Expired / Lapsed | 1982-05-19 | 1984-03-06 | 10 | Details |
| US4435797A | Optical memory system having track following and seeking ca… | Expired / Lapsed | 1982-02-17 | 1984-03-06 | 12 | Details |
| US4432599A | Fiber optic differential sensor | Expired / Lapsed | 1981-03-27 | 1984-02-21 | 8 | Details |
| US4429389A | Test pattern address generator | Expired / Lapsed | 1981-05-26 | 1984-01-31 | 14 | Details |
| US4421384A | Fiber optic transducer | Expired / Lapsed | 1981-07-27 | 1983-12-20 | 9 | Details |
| US4418972A | Electrical connector for printed wiring board | Expired / Lapsed | 1982-02-01 | 1983-12-06 | 6 | Details |
| US4410159A | Adjustable support for a video display terminal | Expired / Lapsed | 1981-07-14 | 1983-10-18 | 11 | Details |
| US4410944A | Apparatus and method for maintaining cache memory integrity… | Expired / Lapsed | 1981-03-24 | 1983-10-18 | 7 | Details |
| US4394733A | Cache/disk subsystem | Expired / Lapsed | 1980-11-14 | 1983-07-19 | 18 | Details |
| US4385799A | Dual array fiber liquid crystal optical switches | Expired / Lapsed | 1980-06-26 | 1983-05-31 | 16 | Details |
| US4385304A | Stacked drop generators for pulsed ink jet printing | Expired / Lapsed | 1980-06-12 | 1983-05-24 | 4 | Details |
| US4380066A | Defect tolerant memory | Expired / Lapsed | 1980-12-04 | 1983-04-12 | 16 | Details |
| US4380052A | Single transmission bus data network employing a daisy-chai… | Expired / Lapsed | 1980-09-15 | 1983-04-12 | 12 | Details |
| US4374402A | Piezoelectric transducer mounting structure and associated … | Expired / Lapsed | 1980-06-27 | 1983-02-15 | 13 | Details |
| US4350951A | Audio analog voltmeter | Expired / Lapsed | 1979-12-26 | 1982-09-21 | 10 | Details |
| US4337465A | Line driver circuit for a local area contention network | Expired / Lapsed | 1980-09-25 | 1982-06-29 | 8 | Details |
| US4331373A | Modular system with system carrier, test carrier and system… | Expired / Lapsed | 1980-03-24 | 1982-05-25 | 7 | Details |
| US4313162A | I/O Subsystem using data link processors | Expired / Lapsed | 1979-12-14 | 1982-01-26 | 15 | Details |
| US4313206A | Clock derivation circuit for double frequency encoded seria… | Expired / Lapsed | 1979-10-19 | 1982-01-26 | 41 | Details |
| US4302835A | Multiple terminal passive multiplexing apparatus | Expired / Lapsed | 1980-01-24 | 1981-11-24 | 10 | Details |
| US4296406A | Pressure sensitive switch structure | Expired / Lapsed | 1979-12-28 | 1981-10-20 | 7 | Details |
| US4293188A | Fiber optic small displacement sensor | Expired / Lapsed | 1980-03-24 | 1981-10-06 | 42 | Details |
| US4291976A | Digital fiber optic position sensor | Expired / Lapsed | 1980-03-10 | 1981-09-29 | 8 | Details |
| US4287592A | Method and apparatus for interfacing stations in a multiloo… | Expired / Lapsed | 1979-05-23 | 1981-09-01 | 48 | Details |
| US4278327A | Liquid crystal matrices | Expired / Lapsed | 1979-11-26 | 1981-07-14 | 43 | Details |
| US4270862A | Magneto-optic light deflector system | Expired / Lapsed | 1979-01-29 | 1981-06-02 | 11 | Details |
| US4259961A | Cooling pad | Expired / Lapsed | 1979-01-24 | 1981-04-07 | 9 | Details |
| US4253144A | Multi-processor communication network | Expired / Lapsed | 1978-12-21 | 1981-02-24 | 18 | Details |
| US4253146A | Module for coupling computer-processors | Expired / Lapsed | 1978-12-21 | 1981-02-24 | 16 | Details |
| US4249173A | Logic signals control system | Expired / Lapsed | 1979-09-14 | 1981-02-03 | 12 | Details |
| US4249196A | Integrated circuit module with integral capacitor | Expired / Lapsed | 1978-08-21 | 1981-02-03 | 5 | Details |
| US4240143A | Hierarchical multi-processor network for memory sharing | Expired / Lapsed | 1978-12-22 | 1980-12-16 | 12 | Details |
| US4228503A | Multiplexed directory for dedicated cache memory system | Expired / Lapsed | 1978-10-02 | 1980-10-14 | 12 | Details |
| US4225879A | V-MOS Field effect transistor for a dynamic memory cell hav… | Expired / Lapsed | 1979-01-26 | 1980-09-30 | 10 | Details |
| US4225935A | Coding method and system with enhanced security | Expired / Lapsed | 1977-08-30 | 1980-09-30 | 18 | Details |
| US4201442A | Liquid crystal switching coupler matrix | Expired / Lapsed | 1978-10-02 | 1980-05-06 | 13 | Details |
| US4189673A | Pen-shaped precision multi-level current mode logic test pr… | Expired / Lapsed | 1978-05-01 | 1980-02-19 | 9 | Details |
| US4181399A | Optical internal reflectance switchable coupler | Expired / Lapsed | 1978-01-03 | 1980-01-01 | 7 | Details |
| US4179737A | Means and methods for providing greater speed and flexibili… | Expired / Lapsed | 1977-12-23 | 1979-12-18 | 19 | Details |
| US4171982A | Acid indicator based high saturation sympathetic ink having… | Expired / Lapsed | 1977-05-13 | 1979-10-23 | 7 | Details |
| US4168457A | Self adaptive speed control system | Expired / Lapsed | 1977-12-29 | 1979-09-18 | 8 | Details |
| US4166211A | Error control system for named data | Expired / Lapsed | 1978-04-03 | 1979-08-28 | 5 | Details |
| US4160124A | Multiple dial adapter | Expired / Lapsed | 1977-05-31 | 1979-07-03 | 7 | Details |
| US4156907A | Data communications subsystem | Expired / Lapsed | 1978-05-15 | 1979-05-29 | 18 | Details |
| US4155119A | Method for providing virtual addressing for externally spec… | Expired / Lapsed | 1977-09-21 | 1979-05-15 | 10 | Details |
| US4150331A | Signature encoding for integrated circuits | Expired / Lapsed | 1977-07-29 | 1979-04-17 | 14 | Details |
| US4149201A | Transducer centering system | Expired / Lapsed | 1978-01-03 | 1979-04-10 | 11 | Details |
| US4147584A | Method for providing low cost wafers for use as substrates … | Expired / Lapsed | 1977-12-27 | 1979-04-03 | 8 | Details |
| US4143941A | Low loss optical data terminal device for multimode fiber g… | Expired / Lapsed | 1977-12-01 | 1979-03-13 | 21 | Details |
| US4142905A | Waterless ink for non-impact jet printers | Expired / Lapsed | 1977-09-09 | 1979-03-06 | 7 | Details |
| US4139147A | Asynchronous digital circuit testing and diagnosing system | Expired / Lapsed | 1977-09-02 | 1979-02-13 | 19 | Details |
| US4130342A | Passive optical channel crossover, switch and bend structure | Expired / Lapsed | 1977-05-31 | 1978-12-19 | 26 | Details |
| US4128875A | Optional virtual memory system | Expired / Lapsed | 1976-12-16 | 1978-12-05 | 20 | Details |
| US4127901A | MNOS FET memory retention characterization test circuit | Expired / Lapsed | 1977-08-03 | 1978-11-28 | 14 | Details |
| US4123142A | Ambiguity plane optical processor incorporating magneto-opt… | Expired / Lapsed | 1977-02-28 | 1978-10-31 | 10 | Details |
| US4107664A | Raster scanned display system | Expired / Lapsed | 1976-07-06 | 1978-08-15 | 10 | Details |
| US4098628A | Method of laminating a cover layer for flexible circuits | Expired / Lapsed | 1976-09-27 | 1978-07-04 | 3 | Details |
| US4097797A | Apparatus for testing electrical circuit units such as prin… | Expired / Lapsed | 1976-06-07 | 1978-06-27 | 12 | Details |
| US4096568A | Virtual address translator | Expired / Lapsed | 1976-09-24 | 1978-06-20 | 9 | Details |
| US4088876A | Error correcting circuits and methods for shift register ty… | Expired / Lapsed | 1976-12-17 | 1978-05-09 | 11 | Details |
| US4087789A | Magnetic ink character recognition system | Expired / Lapsed | 1977-04-27 | 1978-05-02 | 15 | Details |
| US4087809A | Magneto-optic bubble domain histograph | Expired / Lapsed | 1976-07-12 | 1978-05-02 | 4 | Details |
| US4085330A | Focused ion beam mask maker | Expired / Lapsed | 1977-05-19 | 1978-04-18 | 26 | Details |
| US4084225A | Virtual address translator | Expired / Lapsed | 1976-09-24 | 1978-04-11 | 13 | Details |
| US4084226A | Virtual address translator | Expired / Lapsed | 1976-09-24 | 1978-04-11 | 19 | Details |
| US4084260A | Best match content addressable memory | Expired / Lapsed | 1976-07-12 | 1978-04-11 | 4 | Details |
| US4075667A | Method and apparatus for aligning read/write heads in a dis… | Expired / Lapsed | 1975-12-17 | 1978-02-21 | 4 | Details |
| US4074326A | Plural-track record disk initialization system | Expired / Lapsed | 1977-02-17 | 1978-02-14 | 4 | Details |
| US4070706A | Parallel requestor priority determination and requestor add… | Expired / Lapsed | 1976-09-20 | 1978-01-24 | 6 | Details |
| US4070084A | Controlled impedance connector | Expired / Lapsed | 1976-05-20 | 1978-01-24 | 15 | Details |
| US4068298A | Information storage and retrieval system | Expired / Lapsed | 1975-12-03 | 1978-01-10 | 512 | Details |
| US4058851A | Conditional bypass of error correction for dual memory acce… | Expired / Lapsed | 1976-10-18 | 1977-11-15 | 7 | Details |
| US4057847A | Remote controlled test interface unit | Expired / Lapsed | 1976-06-14 | 1977-11-08 | 16 | Details |
| US4051551A | Multidimensional parallel access computer memory system | Expired / Lapsed | 1976-05-03 | 1977-09-27 | 7 | Details |
| US4046961A | Conditioning system for transducer signals | Expired / Lapsed | 1976-03-04 | 1977-09-06 | 37 | Details |
| US4043889A | Method of and apparatus for the radio frequency sputtering … | Expired / Lapsed | 1976-01-02 | 1977-08-23 | 16 | Details |
| US4039813A | Apparatus and method for diagnosing digital data devices | Expired / Lapsed | 1976-04-07 | 1977-08-02 | 19 | Details |
| US4034349A | Apparatus for processing interrupts in microprocessing syst… | Expired / Lapsed | 1976-01-29 | 1977-07-05 | 13 | Details |
| US4031512A | Communications network for general purpose data communicati… | Expired / Lapsed | 1975-05-29 | 1977-06-21 | 19 | Details |
| US4023877A | Means for coupling a connector cable to contacts on a subst… | Expired / Lapsed | 1975-10-23 | 1977-05-17 | 9 | Details |
| US4022370A | Dual in-line chip extractor-exchanger apparatus | Expired / Lapsed | 1976-04-30 | 1977-05-10 | 13 | Details |
| US4021097A | Distributive tee coupler | Expired / Lapsed | 1976-03-08 | 1977-05-03 | 10 | Details |
| US4017803A | Data recovery system resistant to frequency deviations | Expired / Lapsed | 1976-01-29 | 1977-04-12 | 26 | Details |
| US4016548A | Communication multiplexer module | Expired / Lapsed | 1975-04-11 | 1977-04-05 | 13 | Details |
| US4009470A | Pre-emptive, rotational priority system | Expired / Lapsed | 1975-02-18 | 1977-02-22 | 14 | Details |
| US4007441A | Method of data communications in a heterogenous environment | Expired / Lapsed | 1975-05-29 | 1977-02-08 | 9 | Details |
| US4001699A | Bar graph digital interface circuit | Expired / Lapsed | 1975-09-15 | 1977-01-04 | 10 | Details |
| US4001786A | Automatic configuration of main storage addressing ranges | Expired / Lapsed | 1975-07-21 | 1977-01-04 | 21 | Details |
| US3995212A | Apparatus and method for sensing a liquid with a single wir… | Expired / Lapsed | 1975-04-14 | 1976-11-30 | 12 | Details |
| US3987293A | Programmable general purpose analog filter | Expired / Lapsed | 1975-08-04 | 1976-10-19 | 11 | Details |
| US3986094A | Logic system for print ball tilt control | Expired / Lapsed | 1974-07-01 | 1976-10-12 | 23 | Details |
| US3984812A | Computer memory read delay | Expired / Lapsed | 1974-04-15 | 1976-10-05 | 4 | Details |
| US3983468A | Motor drive system including a feedback loop | Expired / Lapsed | 1974-12-30 | 1976-09-28 | 32 | Details |
| US3981011A | Object identification system using an RF roll-call technique | Expired / Lapsed | 1975-03-31 | 1976-09-14 | 15 | Details |
| US3978452A | System and method for concurrent and pipeline processing em… | Expired / Lapsed | 1974-02-28 | 1976-08-31 | 13 | Details |
| US3972024A | Programmable microprocessor | Expired / Lapsed | 1974-03-27 | 1976-07-27 | 9 | Details |
| US3971001A | Reprogrammable read only variable threshold transistor memo… | Expired / Lapsed | 1974-06-10 | 1976-07-20 | 10 | Details |
| US3967247A | Storage interface unit | Expired / Lapsed | 1974-11-11 | 1976-06-29 | 4 | Details |
| US3965430A | Electronic peak sensing digitizer for optical tachometers | Expired / Lapsed | 1975-06-18 | 1976-06-22 | 11 | Details |
| US3963301A | Mother-board interconnection system | Expired / Lapsed | 1974-12-20 | 1976-06-15 | 8 | Details |
| US3942854A | Hold down device for use in electronic systems employing in… | Expired / Lapsed | 1974-10-09 | 1976-03-09 | 9 | Details |
| US3943493A | Shared processor data entry system | Expired / Lapsed | 1974-03-13 | 1976-03-09 | 15 | Details |
| US3942369A | Method of and apparatus for measuring and setting the tensi… | Expired / Lapsed | 1971-08-26 | 1976-03-09 | 14 | Details |
| US3937889A | Data communication apparatus for use in a telephone system | Expired / Lapsed | 1973-01-15 | 1976-02-10 | 7 | Details |
| US3935565A | Signal generator comprising an addressable memory | Expired / Lapsed | 1974-08-19 | 1976-01-27 | 7 | Details |
| US3932840A | Error detection and sequence maintaining system for bar-cod… | Expired / Lapsed | 1974-12-05 | 1976-01-13 | 8 | Details |
| US3921164A | Character generator for a high resolution dot matrix display | Expired / Lapsed | 1974-06-03 | 1975-11-18 | 11 | Details |
| US3921145A | Multirequest grouping computer interface | Expired / Lapsed | 1973-10-12 | 1975-11-18 | 5 | Details |
| US3919462A | Method and apparatus for scrambling and unscrambling commun… | Expired / Lapsed | 1973-08-15 | 1975-11-11 | 59 | Details |
| US3919692A | Fast inhibit gate with applications | Expired / Lapsed | 1972-12-01 | 1975-11-11 | 12 | Details |
| US3917933A | Error logging in LSI memory storage units using FIFO memory… | Expired / Lapsed | 1974-12-17 | 1975-11-04 | 6 | Details |
| US3914677A | Precision motion control device or the like | Expired / Lapsed | 1973-06-08 | 1975-10-21 | 12 | Details |
| US3908381A | Geothermal energy conversion system for maximum energy extr… | Expired / Lapsed | 1974-11-20 | 1975-09-30 | 10 | Details |
| US3906200A | Error logging in semiconductor storage units | Expired / Lapsed | 1974-07-05 | 1975-09-16 | 12 | Details |
| US3905023A | Large scale multi-level information processing system emplo… | Expired / Lapsed | 1973-08-15 | 1975-09-09 | 3 | Details |
| US3900890A | Speed tolerant recording and recovery system | Expired / Lapsed | 1974-05-06 | 1975-08-19 | 8 | Details |
| US3891968A | Coherent optical processor apparatus with improved fourier … | Expired / Lapsed | 1974-04-04 | 1975-06-24 | 16 | Details |
| US3889237A | Common storage controller for dual processor system | Expired / Lapsed | 1973-11-16 | 1975-06-10 | 22 | Details |
| US3886532A | Integrated four-phase digital memory circuit with decoders | Expired / Lapsed | 1974-05-08 | 1975-05-27 | 10 | Details |
| US3880075A | Automatic chain identification method and apparatus | Expired / Lapsed | 1973-12-26 | 1975-04-29 | 14 | Details |
| US3878513A | Data processing method and apparatus using occupancy indica… | Expired / Lapsed | 1972-02-08 | 1975-04-15 | 29 | Details |
| US3872290A | Finite impulse response digital filter with reduced storage | Expired / Lapsed | 1973-09-24 | 1975-03-18 | 7 | Details |
| US3872496A | High frequency diode having simultaneously formed high stre… | Expired / Lapsed | 1973-09-13 | 1975-03-18 | 6 | Details |
| US3859515A | Method and apparatus for signal spectrum analysis by hadama… | Expired / Lapsed | 1973-10-02 | 1975-01-07 | 29 | Details |
| US3856998A | Keyboard switch assembly with improved operating means | Expired / Lapsed | 1973-06-01 | 1974-12-24 | 30 | Details |
| US3851973A | Ring laser magnetic bias mirror compensated for non-recipro… | Expired / Lapsed | 1972-01-03 | 1974-12-03 | 17 | Details |
| US3851161A | Continuity network testing and fault isolating | Expired / Lapsed | 1973-05-07 | 1974-11-26 | 54 | Details |
| US3849631A | Punched card, badge and credit card reader | Expired / Lapsed | 1971-03-04 | 1974-11-19 | 24 | Details |
| US3848234A | Multi-processor system with multiple cache memories | Expired / Lapsed | 1973-04-04 | 1974-11-12 | 18 | Details |
| US3842326A | Velocity control system for reel-to-reel web drive | Expired / Lapsed | 1973-07-27 | 1974-10-15 | 17 | Details |
| US3840859A | Method and apparatus for regulating input/output traffic of… | Expired / Lapsed | 1972-07-03 | 1974-10-08 | 8 | Details |
| US3838423A | Anti-jamming circuit for angle tracking radars | Expired / Lapsed | 1958-10-15 | 1974-09-24 | 7 | Details |
| US3836792A | Four stage storage enhanced logic circuit | Expired / Lapsed | 1971-10-06 | 1974-09-17 | 17 | Details |
| US3833930A | Input/output system for a microprogram digital computer | Expired / Lapsed | 1973-01-12 | 1974-09-03 | 5 | Details |
| US3832900A | Apparatus and method for measuring the level of a contained… | Expired / Lapsed | 1971-06-28 | 1974-09-03 | 10 | Details |
| US3829632A | Protective environment for keyboard actuatable switches | Expired / Lapsed | 1973-03-02 | 1974-08-13 | 4 | Details |
| US3824564A | Integrated threshold mnos memory with decoder and operating… | Expired / Lapsed | 1973-07-19 | 1974-07-16 | 11 | Details |
| US3816194A | High frequency diode and method of manufacture | Expired / Lapsed | 1972-02-04 | 1974-06-11 | 2 | Details |
| US3815131A | Cw surveillance radar system | Expired / Lapsed | 1971-11-29 | 1974-06-04 | 7 | Details |
| US3812468A | Multiprocessing system having means for dynamic redesignati… | Expired / Lapsed | 1972-05-12 | 1974-05-21 | 10 | Details |
| US3810019A | Multifrequency communication system for fading channels | Expired / Lapsed | 1972-09-25 | 1974-05-07 | 10 | Details |
| US3787810A | Test method for a programmable data communication terminal | Expired / Lapsed | 1972-11-02 | 1974-01-22 | 14 | Details |
| US3772697A | Base-band pulse object sensor system | Expired / Lapsed | 1971-04-19 | 1973-11-13 | 17 | Details |
| US3771143A | Method and apparatus for providing alternate storage areas … | Expired / Lapsed | 1972-06-01 | 1973-11-06 | 13 | Details |
| US3768074A | Multiprocessing system having means for permissive coupling… | Expired / Lapsed | 1972-05-12 | 1973-10-23 | 15 | Details |
| US3767968A | Panel-type display device having display cells and auxiliar… | Expired / Lapsed | 1971-10-06 | 1973-10-23 | 31 | Details |
| US3766477A | Spread spectrum, linear fm communications system | Expired / Lapsed | 1971-12-20 | 1973-10-16 | 13 | Details |
| US3763430A | Circuit testing method and apparatus | Expired / Lapsed | 1972-01-14 | 1973-10-02 | 34 | Details |
| US3763424A | Metal detector for identifying and discriminating between o… | Expired / Lapsed | 1971-07-15 | 1973-10-02 | 4 | Details |
| US3761783A | Duel-mesa ring-shaped high frequency diode | Expired / Lapsed | 1972-02-02 | 1973-09-25 | 8 | Details |
| US3761155A | Faraday effect page composer for holographic memory system | Expired / Lapsed | 1971-12-27 | 1973-09-25 | 4 | Details |
| US3760414A | Base band vehicle safety apparatus | Expired / Lapsed | 1971-10-22 | 1973-09-18 | 22 | Details |
| US3757290A | Automatic vehicle monitoring system | Expired / Lapsed | 1971-03-12 | 1973-09-04 | 12 | Details |
| US3753014A | Fast inhibit gate with applications | Expired / Lapsed | 1971-03-15 | 1973-08-14 | 6 | Details |
| US3749940A | Keyboard strobe filter for static keyboards | Expired / Lapsed | 1972-04-21 | 1973-07-31 | 5 | Details |
| US3750125A | Transmission line presence sensor | Expired / Lapsed | 1971-10-20 | 1973-07-31 | 24 | Details |
| US3748447A | Apparatus for performing a linear interpolation algorithm | Expired / Lapsed | 1971-11-18 | 1973-07-24 | 11 | Details |
| US3745536A | High speed serial scan and read-out of keyboards | Expired / Lapsed | 1971-03-01 | 1973-07-10 | 27 | Details |
| US3742460A | Search memory | Expired / Lapsed | 1971-12-20 | 1973-06-26 | 6 | Details |
| US3739160A | Method and apparatus for fault testing binary circuit subsy… | Expired / Lapsed | 1971-11-08 | 1973-06-12 | 46 | Details |
| US3732390A | Keyswitch | Expired / Lapsed | 1971-12-27 | 1973-05-08 | 4 | Details |
| US3728693A | Programmatically controlled interrupt system for controllin… | Expired / Lapsed | 1972-04-28 | 1973-04-17 | 28 | Details |
| US3725876A | Data processor having an addressable local memory linked to… | Expired / Lapsed | 1972-02-08 | 1973-04-03 | 21 | Details |
| US3725872A | Data processing system having status indicating and storage… | Expired / Lapsed | 1971-03-03 | 1973-04-03 | 34 | Details |
| US3725789A | Temperature controlled clocking of logic circuits | Expired / Lapsed | 1970-12-21 | 1973-04-03 | 8 | Details |
| US3725868A | Small reconfigurable processor for a variety of data proces… | Expired / Lapsed | 1970-10-19 | 1973-04-03 | 4 | Details |
| US3722927A | Latch and return spring | Expired / Lapsed | 1971-05-20 | 1973-03-27 | 9 | Details |
| US3721919A | High efficiency mode planar microcircuit high frequency sig… | Expired / Lapsed | 1972-03-13 | 1973-03-20 | 10 | Details |
| US3721882A | Positioning system | Expired / Lapsed | 1971-06-25 | 1973-03-20 | 10 | Details |
| US3717873A | Ship's maneuver assessment system | Expired / Lapsed | 1970-11-05 | 1973-02-20 | 12 | Details |
| US3716301A | Fingerprint identification apparatus | Expired / Lapsed | 1971-03-17 | 1973-02-13 | 9 | Details |
| US3703707A | Dual clock memory access control | Expired / Lapsed | 1971-04-28 | 1972-11-21 | 11 | Details |
| US3699528A | Address manipulation circuitry for a digital computer | Expired / Lapsed | 1970-02-16 | 1972-10-17 | 51 | Details |
| US3697711A | Snap action switch | Expired / Lapsed | 1971-06-29 | 1972-10-10 | 2 | Details |
| US3696908A | Capacitive key | Expired / Lapsed | 1970-11-09 | 1972-10-10 | 16 | Details |
| US3696946A | Conveyor system having a plurality of carrier position sens… | Expired / Lapsed | 1970-05-15 | 1972-10-10 | 16 | Details |
| US3693161A | Apparatus for interrogating the availability of a communica… | Expired / Lapsed | 1970-07-09 | 1972-09-19 | 7 | Details |
| US3691474A | Phase detector initializer for oscillator synchronization | Expired / Lapsed | 1970-12-04 | 1972-09-12 | 15 | Details |
| US3691535A | Solid state memory array | Expired / Lapsed | 1970-06-15 | 1972-09-12 | 8 | Details |
| US3688273A | Digital data communication system providing a recirculating… | Expired / Lapsed | 1970-11-09 | 1972-08-29 | 14 | Details |
| US3685012A | Apparatus for determining data associated with objects | Expired / Lapsed | 1970-04-16 | 1972-08-15 | 31 | Details |
| US3683364A | Display panel wherein each scanning cell is associated with… | Expired / Lapsed | 1971-01-18 | 1972-08-08 | 12 | Details |
| US3683371A | Magnetic keyboard terminal | Expired / Lapsed | 1970-09-15 | 1972-08-08 | 12 | Details |
| US3683273A | Method and apparatus for measuring fluid film bearings | Expired / Lapsed | 1970-02-27 | 1972-08-08 | 16 | Details |
| US3678482A | Multiple surface fluid film bearing | Expired / Lapsed | 1970-08-26 | 1972-07-18 | 20 | Details |
| US3674331A | Space division multiplexed holographic apparatus | Expired / Lapsed | 1970-10-09 | 1972-07-04 | 0 | Details |
| US3675201A | Threshold voltage determination system | Expired / Lapsed | 1970-02-24 | 1972-07-04 | 4 | Details |
| US3675209A | Autonomous multiple-path input/output control system | Expired / Lapsed | 1970-02-06 | 1972-07-04 | 26 | Details |
| US3671940A | Test apparatus for digital computer | Expired / Lapsed | 1970-03-19 | 1972-06-20 | 9 | Details |
| US3668644A | Failsafe memory system | Expired / Lapsed | 1970-02-09 | 1972-06-06 | 10 | Details |
| US3665404A | Multi-processor processing system having interprocessor int… | Expired / Lapsed | 1970-04-09 | 1972-05-23 | 34 | Details |
| US3665421A | Information processing system implementing program structur… | Expired / Lapsed | 1969-11-28 | 1972-05-23 | 13 | Details |
| US3665472A | Two-way communication system employing two-clock frequency … | Expired / Lapsed | 1969-10-08 | 1972-05-23 | 5 | Details |
| US3662316A | Short base-band pulse receiver | Expired / Lapsed | 1971-03-12 | 1972-05-09 | 13 | Details |
| US3662352A | A. c. plasma display panel interrogating apparatus | Expired / Lapsed | 1970-05-25 | 1972-05-09 | 17 | Details |
| US3659272A | Digital computer with a program-trace facility | Expired / Lapsed | 1970-05-13 | 1972-04-25 | 5 | Details |
| US3656109A | Hamming distance and magnitude detector and comparator | Expired / Lapsed | 1970-03-13 | 1972-04-11 | 14 | Details |
| US3654486A | Transistor logic circuit with upset feedback | Expired / Lapsed | 1970-05-26 | 1972-04-04 | 15 | Details |
| US3654554A | Secure pulse compression coding system | Expired / Lapsed | 1963-01-29 | 1972-04-04 | 26 | Details |
| US3649931A | Compensated frequency biasing system for ring laser | Expired / Lapsed | 1969-11-03 | 1972-03-14 | 12 | Details |
| US3648253A | Program scheduler for processing systems | Expired / Lapsed | 1969-12-10 | 1972-03-07 | 76 | Details |
| US3646519A | Method and apparatus for testing logic functions in a multi… | Expired / Lapsed | 1970-02-02 | 1972-02-29 | 6 | Details |
| US3642375A | Optical combiner | Expired / Lapsed | 1969-10-02 | 1972-02-15 | 9 | Details |
| US3638198A | Priority resolution network for input/output exchange | Expired / Lapsed | 1969-07-09 | 1972-01-25 | 10 | Details |
| US3636521A | Programming system | Expired / Lapsed | 1970-08-21 | 1972-01-18 | 20 | Details |
| US3633084A | Brushless dc motor having automatic braking | Expired / Lapsed | 1970-06-24 | 1972-01-04 | 8 | Details |
| US3633017A | Digital waveform generator | Expired / Lapsed | 1970-01-07 | 1972-01-04 | 24 | Details |
| US3633189A | Cable structure for magnetic head assembly | Expired / Lapsed | 1969-09-24 | 1972-01-04 | 22 | Details |
| US3631346A | Low self-noise radiometer system | Expired / Lapsed | 1970-02-02 | 1971-12-28 | 8 | Details |
| US3631421A | Data storage addressing system | Expired / Lapsed | 1968-09-23 | 1971-12-28 | 30 | Details |
| US3629854A | Modular multiprocessor system with recirculating priority | Expired / Lapsed | 1969-07-22 | 1971-12-21 | 6 | Details |
| US3626382A | Data processing terminal unit | Expired / Lapsed | 1969-11-19 | 1971-12-07 | 9 | Details |
| US3623017A | Dual clocking arrangement for a digital computer | Expired / Lapsed | 1969-10-22 | 1971-11-23 | 7 | Details |
| US3623013A | Data processing network and improved terminal | Expired / Lapsed | 1969-08-13 | 1971-11-23 | 13 | Details |
| US3622995A | Automatic ticket/credit card check-in system | Expired / Lapsed | 1969-03-21 | 1971-11-23 | 20 | Details |
| US3616532A | Multilayer printed circuit electrical interconnection device | Expired / Lapsed | 1970-02-02 | 1971-11-02 | 0 | Details |
| US3618037A | Digital data communication multiple line control | Expired / Lapsed | 1969-09-19 | 1971-11-02 | 17 | Details |
| US3617724A | Shifted sequence pseudo random coded reticle correlation ap… | Expired / Lapsed | 1968-04-04 | 1971-11-02 | 7 | Details |
| US3610730A | Fluidic prism | Expired / Lapsed | 1969-10-23 | 1971-10-05 | 17 | Details |
| US3611417A | High-density magnetic recording method | Expired / Lapsed | 1969-07-30 | 1971-10-05 | 6 | Details |
| US3611306A | Mechanism to control the sequencing of partially ordered in… | Expired / Lapsed | 1969-02-05 | 1971-10-05 | 10 | Details |
| US3609665A | Apparatus for exchanging information between a high-speed m… | Expired / Lapsed | 1970-03-19 | 1971-09-28 | 14 | Details |
| US3609743A | Display unit | Expired / Lapsed | 1967-02-01 | 1971-09-28 | 17 | Details |
| US3606034A | Article handling apparatus | Expired / Lapsed | 1969-06-04 | 1971-09-20 | 0 | Details |
| US3604906A | Verifier for signal controlled mechanism | Expired / Lapsed | 1969-09-04 | 1971-09-14 | 11 | Details |
| US3605025A | Fractional output frequency-dividing apparatus | Expired / Lapsed | 1969-06-30 | 1971-09-14 | 4 | Details |
| US3603756A | Snap action switch | Expired / Lapsed | 1970-01-29 | 1971-09-07 | 4 | Details |
| US3601756A | Terminator connector for multiconductor cable | Expired / Lapsed | 1969-08-14 | 1971-08-24 | 11 | Details |
| US3598974A | Programmable digital differential analyzer integrator | Expired / Lapsed | 1967-09-15 | 1971-08-10 | 28 | Details |
| US3597752A | Fm magnetic recording and sensing utilizing bit periods of … | Expired / Lapsed | 1969-09-17 | 1971-08-03 | 42 | Details |
| US3594758A | Drive circuitry for display tubes | Expired / Lapsed | 1968-04-25 | 1971-07-20 | 9 | Details |
| US3593315A | Method and apparatus for deallocating small memory spaces a… | Expired / Lapsed | 1969-09-17 | 1971-07-13 | 13 | Details |
| US3588834A | Terminal station | Expired / Lapsed | 1968-10-29 | 1971-06-28 | 0 | Details |
| US3586833A | Card reader format control system | Expired / Lapsed | 1969-09-12 | 1971-06-22 | 4 | Details |
| US3585507A | Pulse discrimination circuitry | Expired / Lapsed | 1968-08-30 | 1971-06-15 | 16 | Details |
| US3584309A | Method and means for compensating amplitude and time drifts… | Expired / Lapsed | 1969-07-23 | 1971-06-08 | 14 | Details |
| US3582899A | Method and apparatus for routing data among processing elem… | Expired / Lapsed | 1968-03-21 | 1971-06-01 | 6 | Details |
| US3579795A | Component removing tool | Expired / Lapsed | 1969-08-08 | 1971-05-25 | 21 | Details |
| US3581268A | Electrical connection and distribution system | Expired / Lapsed | 1969-04-01 | 1971-05-25 | 7 | Details |
| US3578846A | Multiple-stage optical information processing system | Expired / Lapsed | 1969-01-31 | 1971-05-18 | 3 | Details |
| US3579186A | Personal identification method and apparatus | Expired / Lapsed | 1968-06-25 | 1971-05-18 | 26 | Details |
| US3576570A | Synchronous timing scheme for a data processing system | Expired / Lapsed | 1968-12-12 | 1971-04-27 | 7 | Details |
| US3576541A | Method and apparatus for detecting and diagnosing computer … | Expired / Lapsed | 1968-01-02 | 1971-04-27 | 46 | Details |
| US3575658A | Method for measuring incremental speed of tape transport | Expired / Lapsed | 1969-09-17 | 1971-04-20 | 33 | Details |
| US3573743A | Programmable timing controls for magnetic memories | Expired / Lapsed | 1968-09-30 | 1971-04-06 | 18 | Details |
| US3568160A | Access control for plural magnetic memories | Expired / Lapsed | 1968-09-03 | 1971-03-02 | 11 | Details |
| US3566364A | Data processor having operator family controllers | Expired / Lapsed | 1968-07-19 | 1971-02-23 | 0 | Details |
| US3564558A | High-density magnetic recording scheme | Expired / Lapsed | 1968-08-26 | 1971-02-16 | 0 | Details |
| US3564509A | Data processing apparatus | Expired / Lapsed | 1968-04-22 | 1971-02-16 | 0 | Details |
| US3562713A | Method and apparatus for establishing a branch communicatio… | Expired / Lapsed | 1967-03-17 | 1971-02-09 | 0 | Details |
| US3560935A | Interrupt apparatus for a modular data processing system | Expired / Lapsed | 1968-03-15 | 1971-02-02 | 0 | Details |
| US3559184A | Line adapter for data communication system | Expired / Lapsed | 1968-08-30 | 1971-01-26 | 0 | Details |
| US3555515A | Memory system having associative cells for marking locations | Expired / Lapsed | 1968-06-27 | 1971-01-12 | 0 | Details |
| US3555513A | Multiprocessor digital computer system with address modific… | Expired / Lapsed | 1967-10-11 | 1971-01-12 | 0 | Details |
| US3553659A | Biemitter transistor search memory array | Expired / Lapsed | 1968-12-11 | 1971-01-05 | 0 | Details |
| US3553499A | Fast-acting avalanche mode transistor switch | Expired / Lapsed | 1968-07-17 | 1971-01-05 | 6 | Details |
| US3548384A | Procedure entry for a data processor employing a stack | Expired / Lapsed | 1967-10-02 | 1970-12-15 | 0 | Details |
| US3546686A | Random access system | Expired / Lapsed | 1969-09-22 | 1970-12-08 | 0 | Details |
| US3544971A | Device for automatically displaying the logic elements and … | Expired / Lapsed | 1968-02-21 | 1970-12-01 | 0 | Details |
| US3540012A | Crt display editing circuit | Expired / Lapsed | 1967-12-26 | 1970-11-10 | 0 | Details |
| US3539998A | Communications system and remote scanner and control units | Expired / Lapsed | 1967-07-12 | 1970-11-10 | 0 | Details |
| US3539244A | Electromagnetic radiation deflection apparatus employing el… | Expired / Lapsed | 1966-08-23 | 1970-11-10 | 0 | Details |
| US3537074A | Parallel operating array computer | Expired / Lapsed | 1967-12-20 | 1970-10-27 | 0 | Details |
| US3537075A | Data storage timing system | Expired / Lapsed | 1967-08-14 | 1970-10-27 | 0 | Details |
| US3537072A | Instruction conversion system and apparatus | Expired / Lapsed | 1967-06-19 | 1970-10-27 | 0 | Details |
| US3534339A | Service request priority resolver and encoder | Expired / Lapsed | 1967-08-24 | 1970-10-13 | 0 | Details |
| US3533083A | Dummy wire selection scheme for data processing equipment m… | Expired / Lapsed | 1968-01-30 | 1970-10-06 | 0 | Details |
| US3533078A | Keyboard entry control apparatus | Expired / Lapsed | 1967-12-04 | 1970-10-06 | 0 | Details |
| US3533076A | Electronic accounting apparatus | Expired / Lapsed | 1967-10-30 | 1970-10-06 | 0 | Details |
| US3531702A | Logic control system for brushless d.c. motors | Expired / Lapsed | 1968-03-05 | 1970-09-29 | 0 | Details |
| US3530438A | Task control | Expired / Lapsed | 1965-12-13 | 1970-09-22 | 0 | Details |
| US3528295A | Stylus with pressure responsive transducer | Expired / Lapsed | 1968-06-25 | 1970-09-15 | 0 | Details |
| US3528060A | Time variable stop bit scheme for data processing system | Expired / Lapsed | 1968-06-20 | 1970-09-08 | 0 | Details |
| US3519354A | System for measuring extinction coefficients in the atmosph… | Expired / Lapsed | 1965-06-17 | 1970-07-07 | 0 | Details |
| US3516073A | Data and control character discrimination scheme for digita… | Expired / Lapsed | 1968-04-01 | 1970-06-02 | 0 | Details |
| US3514758A | Digital computer system having multi-line control unit | Expired / Lapsed | 1967-03-27 | 1970-05-26 | 0 | Details |
| US3512424A | Chain | Expired / Lapsed | 1968-06-06 | 1970-05-19 | 0 | Details |
| US3512037A | Dot-scan tangent-fix tracking technique for graphic display… | Expired / Lapsed | 1969-03-03 | 1970-05-12 | 0 | Details |
| US3512133A | Digital data transmission system having means for automatic… | Expired / Lapsed | 1967-03-27 | 1970-05-12 | 0 | Details |
| US3510847A | Address manipulation circuitry for a digital computer | Expired / Lapsed | 1967-09-25 | 1970-05-05 | 0 | Details |
| US3510843A | Digital data transmission system having means for automatic… | Expired / Lapsed | 1967-03-27 | 1970-05-05 | 0 | Details |
| US3505650A | Visual character display device | Expired / Lapsed | 1967-01-17 | 1970-04-07 | 0 | Details |
| US3505665A | Display system | Expired / Lapsed | 1966-06-13 | 1970-04-07 | 0 | Details |
| US3498569A | Coaxial tape storage reel drive module | Expired / Lapsed | 1967-12-08 | 1970-03-03 | 0 | Details |
| US3497760A | Logical expansion circuitry for display systems | Expired / Lapsed | 1968-06-10 | 1970-02-24 | 0 | Details |
| US3495324A | Ohmic contact for planar devices | Expired / Lapsed | 1967-11-13 | 1970-02-17 | 0 | Details |
| US3496550A | Digital processor with variable field length operands using… | Expired / Lapsed | 1967-02-27 | 1970-02-17 | 0 | Details |
| US3495236A | Transducer | Expired / Lapsed | 1969-04-16 | 1970-02-10 | 0 | Details |
| US3493866A | Frequency stepped phase shift keyed communication system | Expired / Lapsed | 1968-06-13 | 1970-02-03 | 0 | Details |
| US3488634A | Bidirectional distribution system | Expired / Lapsed | 1967-03-02 | 1970-01-06 | 0 | Details |
| US3487375A | Multi-program data processor | Expired / Lapsed | 1967-06-19 | 1969-12-30 | 0 | Details |
| US3486130A | Ring laser having a quarter wave plate for rotating the pla… | Expired / Lapsed | 1966-09-20 | 1969-12-23 | 0 | Details |
| US3483455A | Malfunction detection circuit | Expired / Lapsed | 1967-03-30 | 1969-12-09 | 0 | Details |
| US3483388A | Apparatus for generating signals indicative of the persiste… | Expired / Lapsed | 1964-09-02 | 1969-12-09 | 0 | Details |
| US3482214A | Buffering of control word and data word system memory trans… | Expired / Lapsed | 1966-10-03 | 1969-12-02 | 0 | Details |
| US3482184A | Laser device having multiple cavities that share a common a… | Expired / Lapsed | 1965-07-19 | 1969-12-02 | 0 | Details |
| US3476922A | Failure monitor for redundant channel systems | Expired / Lapsed | 1966-08-05 | 1969-11-04 | 0 | Details |
| US3471789A | Single pulse switch logic circuit | Expired / Lapsed | 1967-02-15 | 1969-10-07 | 0 | Details |
| US3466645A | Digital data crt display system | Expired / Lapsed | 1965-03-01 | 1969-09-09 | 0 | Details |
| US3465312A | Balanced bit-sense matrix | Expired / Lapsed | 1965-11-19 | 1969-09-02 | 0 | Details |
| US3463566A | Automatic article-handling system | Expired / Lapsed | 1967-10-16 | 1969-08-26 | 0 | Details |
| US3461434A | Stack mechanism having multiple display registers | Expired / Lapsed | 1967-10-02 | 1969-08-12 | 0 | Details |
| US3461433A | Relative addressing system for memories | Expired / Lapsed | 1967-01-27 | 1969-08-12 | 0 | Details |
| US3461432A | Bi-directional code converter | Expired / Lapsed | 1966-12-14 | 1969-08-12 | 0 | Details |
| US3460098A | Non-synchronous design for digital device control | Expired / Lapsed | 1967-03-15 | 1969-08-05 | 0 | Details |
| US3458240A | Function generator for producing the possible boolean funct… | Expired / Lapsed | 1965-12-28 | 1969-07-29 | 0 | Details |
| US3454750A | Character oriented data processor with floating decimal poi… | Expired / Lapsed | 1966-05-18 | 1969-07-08 | 0 | Details |
| US3454929A | Computer edit system | Expired / Lapsed | 1966-03-25 | 1969-07-08 | 0 | Details |
| US3453514A | Single sensor brushless d.c. motor | Expired / Lapsed | 1967-05-02 | 1969-07-01 | 0 | Details |
| US3449735A | Transducer positioning system | Expired / Lapsed | 1965-12-30 | 1969-06-10 | 0 | Details |
| US3446946A | Power-moment self-adaptive control system | Expired / Lapsed | 1964-12-01 | 1969-05-27 | 0 | Details |
| US3440440A | Input-output circuit | Expired / Lapsed | 1966-04-29 | 1969-04-22 | 2 | Details |
| US3440464A | Electromagnetic apparatus | Expired / Lapsed | 1965-08-02 | 1969-04-22 | 0 | Details |
| US3439218A | Control circuit for causing movement of a cathode ray tube … | Expired / Lapsed | 1966-09-30 | 1969-04-15 | 0 | Details |
| US3439117A | Keyboard controlled magnetic core information storage and t… | Expired / Lapsed | 1965-09-30 | 1969-04-15 | 0 | Details |
| US3437998A | File control system | Expired / Lapsed | 1965-11-26 | 1969-04-08 | 0 | Details |
| US3436556A | Optical inspection system | Expired / Lapsed | 1966-03-24 | 1969-04-01 | 0 | Details |
| US3435257A | Threshold biased control circuit for trailing edge triggere… | Expired / Lapsed | 1965-05-17 | 1969-03-25 | 0 | Details |
| US3434135A | Constant velocity beam deflection control responsive to dig… | Expired / Lapsed | 1966-08-01 | 1969-03-18 | 0 | Details |
| US3431475A | Solid state servo system including a unique d.c. control tr… | Expired / Lapsed | 1965-08-18 | 1969-03-04 | 0 | Details |
| US3430226A | Calculators | Expired / Lapsed | 1965-05-05 | 1969-02-25 | 0 | Details |
| US3427593A | Data processor with improved program loading operation | Expired / Lapsed | 1966-03-24 | 1969-02-11 | 0 | Details |
| US3426330A | Central data processor | Expired / Lapsed | 1966-02-14 | 1969-02-04 | 0 | Details |
| US3426323A | Error correction by retransmission | Expired / Lapsed | 1965-03-08 | 1969-02-04 | 0 | Details |
| US3423646A | Computer logic device consisting of an array of tunneling d… | Expired / Lapsed | 1965-02-01 | 1969-01-21 | 2 | Details |
| US3422405A | Digital computer having an indirect field length operation | Expired / Lapsed | 1966-03-25 | 1969-01-14 | 0 | Details |
| US3421150A | Multiprocessor interrupt directory | Expired / Lapsed | 1966-08-26 | 1969-01-07 | 0 | Details |
| US3419852A | Input/output control system for electronic computers | Expired / Lapsed | 1966-02-14 | 1968-12-31 | 0 | Details |
| US3419330A | Diffraction grating angular rate sensor | Expired / Lapsed | 1965-04-06 | 1968-12-31 | 0 | Details |
| US3417378A | Multiple frequency data handling system | Expired / Lapsed | 1966-09-13 | 1968-12-17 | 2 | Details |
| US3417377A | Shift and buffer circuitry | Expired / Lapsed | 1966-09-13 | 1968-12-17 | 2 | Details |
| US3416139A | Interface control module for modular computer system and pl… | Expired / Lapsed | 1966-02-14 | 1968-12-10 | 0 | Details |
| US3411204A | Construction of electrical circuits | Expired / Lapsed | 1965-07-06 | 1968-11-19 | 0 | Details |
| US3412255A | Character recognition system using selectively positioned l… | Expired / Lapsed | 1964-12-22 | 1968-11-19 | 2 | Details |
| US3411147A | Apparatus for executing halt instructions in a multi-progra… | Expired / Lapsed | 1966-03-24 | 1968-11-12 | 2 | Details |
| US3411139A | Modular multi-computing data processing system | Expired / Lapsed | 1965-11-26 | 1968-11-12 | 0 | Details |
| US3411093A | Frequency tracking circuits | Expired / Lapsed | 1965-09-02 | 1968-11-12 | 0 | Details |
| US3410979A | Method and apparatus for drilling holes by means of a focus… | Expired / Lapsed | 1964-05-28 | 1968-11-12 | 0 | Details |
| US3408632A | Input/output control for a digital computing system | Expired / Lapsed | 1966-06-03 | 1968-10-29 | 2 | Details |
| US3408630A | Digital computer having high speed branch operation | Expired / Lapsed | 1966-03-25 | 1968-10-29 | 0 | Details |
| US3407357A | Planar interconnecting network avoiding signal path crossov… | Expired / Lapsed | 1966-01-21 | 1968-10-22 | 0 | Details |
| US3407387A | On-line banking system | Expired / Lapsed | 1965-03-01 | 1968-10-22 | 0 | Details |
| US3405392A | Electronic calculators | Expired / Lapsed | 1965-04-30 | 1968-10-08 | 0 | Details |
| US3405337A | Fail operational control system for redundant servos with t… | Expired / Lapsed | 1965-04-13 | 1968-10-08 | 0 | Details |
| US3403386A | Format control | Expired / Lapsed | 1966-01-24 | 1968-09-24 | 0 | Details |
| US3401904A | Cross-channel monitoring for aircraft | Expired / Lapsed | 1967-01-03 | 1968-09-17 | 0 | Details |
| US3401343A | High speed binary counter employing j-k flip-flops | Expired / Lapsed | 1966-05-23 | 1968-09-10 | 2 | Details |
| US3401376A | Central processor | Expired / Lapsed | 1965-11-26 | 1968-09-10 | 0 | Details |
| US3401268A | Optical correlator utilizing a plurality of axially aligned… | Expired / Lapsed | 1965-09-10 | 1968-09-10 | 0 | Details |
| US3400380A | Digital computer having an address controller operation | Expired / Lapsed | 1966-03-25 | 1968-09-03 | 2 | Details |
| US3399391A | Holding circuit for servo mechanism | Expired / Lapsed | 1964-06-10 | 1968-08-27 | 0 | Details |
| US3398405A | Digital computer with memory lock operation | Expired / Lapsed | 1965-06-07 | 1968-08-20 | 0 | Details |
| US3395353A | Pulse width discriminator | Expired / Lapsed | 1966-04-18 | 1968-07-30 | 2 | Details |
| US3390385A | Magnetic drum recording apparatus with replaceable sleeve | Expired / Lapsed | 1966-02-01 | 1968-06-25 | 2 | Details |
| US3390379A | Data communication system | Expired / Lapsed | 1965-07-26 | 1968-06-25 | 0 | Details |
| US3389380A | Signal responsive apparatus | Expired / Lapsed | 1965-10-05 | 1968-06-18 | 0 | Details |
| US3389376A | Micro-program operated multiple addressed memory | Expired / Lapsed | 1965-07-06 | 1968-06-18 | 0 | Details |
| US3388465A | Electronic assembly soldering process | Expired / Lapsed | 1965-03-01 | 1968-06-18 | 0 | Details |
| US3388461A | Precision electrical component adjustment method | Expired / Lapsed | 1965-01-26 | 1968-06-18 | 0 | Details |
| US3386689A | Aircraft autopilot with control wheel steering | Expired / Lapsed | 1967-02-06 | 1968-06-04 | 0 | Details |
| US3387276A | Off-line memory test | Expired / Lapsed | 1965-08-13 | 1968-06-04 | 0 | Details |
| US3387140A | Optical signal correlator using rotary photochromic record … | Expired / Lapsed | 1965-06-21 | 1968-06-04 | 1 | Details |
| US3387274A | Memory apparatus and method | Expired / Lapsed | 1965-06-21 | 1968-06-04 | 0 | Details |
| US3386019A | Brushless direct current motor | Expired / Lapsed | 1966-04-19 | 1968-05-28 | 0 | Details |
| US3380055A | Millimeter wave radiometer system for measuring air tempera… | Expired / Lapsed | 1966-01-07 | 1968-04-23 | 0 | Details |
| US3375507A | Information address recording and retrieval system | Expired / Lapsed | 1967-03-13 | 1968-03-26 | 0 | Details |
| US3373334A | Regulated d.c. to d.c. power supply | Expired / Lapsed | 1965-06-01 | 1968-03-12 | 0 | Details |
| US3371320A | Multipurpose matrix | Expired / Lapsed | 1965-03-12 | 1968-02-27 | 0 | Details |
| US3364395A | Modular data processing apparatus including heat dissipatin… | Expired / Lapsed | 1965-01-26 | 1968-01-16 | 0 | Details |
| US3363234A | Data processing system | Expired / Lapsed | 1962-08-24 | 1968-01-09 | 2 | Details |
| US3360781A | Control circuit for a key punch or verifier | Expired / Lapsed | 1964-10-26 | 1967-12-26 | 2 | Details |
| US3359544A | Multiple program computer | Expired / Lapsed | 1965-08-09 | 1967-12-19 | 2 | Details |
| US3358243A | Laser having interferometer controlled oscillatory modes | Expired / Lapsed | 1963-03-25 | 1967-12-12 | 2 | Details |
| US3354321A | Matrix selection circuit with automatic discharge circuit | Expired / Lapsed | 1963-08-16 | 1967-11-21 | 1 | Details |
| US3354432A | Document reading system | Expired / Lapsed | 1962-02-23 | 1967-11-21 | 1 | Details |
| US3351917A | Information storage and retrieval system having a dynamic m… | Expired / Lapsed | 1965-02-05 | 1967-11-07 | 1 | Details |
| US3350691A | Alterable read-only storage device | Expired / Lapsed | 1964-05-06 | 1967-10-31 | 2 | Details |
| US3350706A | Translator | Expired / Lapsed | 1964-04-06 | 1967-10-31 | 1 | Details |
| US3349255A | Delay multivibrator | Expired / Lapsed | 1965-04-20 | 1967-10-24 | 2 | Details |
| US3349390A | Nonlinear analog to digital converter | Expired / Lapsed | 1964-08-31 | 1967-10-24 | 2 | Details |
| US3346844A | Binary coded signal correlator | Expired / Lapsed | 1965-06-09 | 1967-10-10 | 2 | Details |
| US3344898A | Coin-operated dispensing system | Expired / Lapsed | 1966-01-03 | 1967-10-03 | 2 | Details |
| US3344401A | Inquiry system | Expired / Lapsed | 1963-03-15 | 1967-09-26 | 1 | Details |
| US3343132A | Data processing system | Expired / Lapsed | 1963-05-16 | 1967-09-19 | 2 | Details |
| US3341814A | Character recognition | Expired / Lapsed | 1962-07-11 | 1967-09-12 | 1 | Details |
| US3339203A | Windscreen type display apparatus | Expired / Lapsed | 1965-02-01 | 1967-08-29 | 1 | Details |
| US3339183A | Copy memory for a digital processor | Expired / Lapsed | 1964-11-16 | 1967-08-29 | 2 | Details |
| US3337851A | Memory organization for reducing access time of program rep… | Expired / Lapsed | 1963-12-09 | 1967-08-22 | 2 | Details |
| US3335369A | System for data communication by phase shift of square wave… | Expired / Lapsed | 1964-06-01 | 1967-08-08 | 2 | Details |
| US3334236A | Photo-optical light pen and amplifier | Expired / Lapsed | 1964-11-23 | 1967-08-01 | 2 | Details |
| US3333252A | Time-dependent priority system | Expired / Lapsed | 1965-01-18 | 1967-07-25 | 2 | Details |
| US3333244A | Analog signal responsive circuit for recognizing unknowns | Expired / Lapsed | 1964-11-06 | 1967-07-25 | 2 | Details |
| US3333279A | Method of making frequency responsive device | Expired / Lapsed | 1964-04-29 | 1967-07-25 | 1 | Details |
| US3332757A | Method of making fiber optic frequency responsive device | Expired / Lapsed | 1963-12-13 | 1967-07-25 | 2 | Details |
| US3332069A | Search memory | Expired / Lapsed | 1964-07-09 | 1967-07-18 | 2 | Details |
| US3331055A | Data communication system with matrix selection of line ter… | Expired / Lapsed | 1964-06-01 | 1967-07-11 | 2 | Details |
| US3331051A | Error detection and correction circuits | Expired / Lapsed | 1963-09-30 | 1967-07-11 | 2 | Details |
| US3329881A | Power and control means for electrical appliances | Expired / Lapsed | 1964-07-27 | 1967-07-04 | 2 | Details |
| US3329948A | Symbol generating apparatus | Expired / Lapsed | 1963-05-03 | 1967-07-04 | 2 | Details |
| US3329947A | Electronic character generator | Expired / Lapsed | 1963-03-07 | 1967-07-04 | 1 | Details |
| US3328773A | Data processor set and indicate control systems | Expired / Lapsed | 1965-02-01 | 1967-06-27 | 2 | Details |
| US3328769A | Information sorting device | Expired / Lapsed | 1964-04-21 | 1967-06-27 | 2 | Details |
| US3325802A | Complex pattern generation apparatus | Expired / Lapsed | 1964-09-04 | 1967-06-13 | 2 | Details |
| US3323527A | Electronic coin counter | Expired / Lapsed | 1966-03-29 | 1967-06-06 | 2 | Details |
| US3324471A | Image producing apparatus with deviation indication | Expired / Lapsed | 1964-06-29 | 1967-06-06 | 2 | Details |
| US3320588A | Character reader | Expired / Lapsed | 1963-12-30 | 1967-05-16 | 1 | Details |
| US3320599A | Mounting and actuating apparatus for a magnetic head | Expired / Lapsed | 1963-06-07 | 1967-05-16 | 2 | Details |
| US3320409A | Electronic plotting device | Expired / Lapsed | 1963-01-30 | 1967-05-16 | 2 | Details |
| US3319226A | Data processor module for a modular data processing system … | Expired / Lapsed | 1962-11-30 | 1967-05-09 | 1 | Details |
| US3316417A | Electrical power and control mechanism for electrical appli… | Expired / Lapsed | 1965-02-18 | 1967-04-25 | 2 | Details |
| US3315212A | Connector assembly | Expired / Lapsed | 1964-07-20 | 1967-04-18 | 2 | Details |
| US3315248A | Display tube having an encapsulated diode switching matrix | Expired / Lapsed | 1963-12-09 | 1967-04-18 | 1 | Details |
| US3312969A | Radar video processor and clutter eliminator | Expired / Lapsed | 1965-07-09 | 1967-04-04 | 2 | Details |
| US3311901A | Plated wire content addressed memory | Expired / Lapsed | 1963-12-30 | 1967-03-28 | 2 | Details |
| US3310710A | Electrical circuit packaging assembly | Expired / Lapsed | 1965-04-13 | 1967-03-21 | 2 | Details |
| US3310660A | Asynchronous counting devices | Expired / Lapsed | 1963-04-23 | 1967-03-21 | 2 | Details |
| US3309602A | Current controllers | Expired / Lapsed | 1963-07-18 | 1967-03-14 | 2 | Details |
| US3305733A | Complementary symmetry differential pulse integrator | Expired / Lapsed | 1963-07-01 | 1967-02-21 | 2 | Details |
| US3305839A | Buffer system | Expired / Lapsed | 1963-03-22 | 1967-02-21 | 2 | Details |
| US3302183A | Micro-program digital computer | Expired / Lapsed | 1963-11-26 | 1967-01-31 | 2 | Details |
| US3302182A | Store and forward message switching system utilizing a modu… | Expired / Lapsed | 1963-10-03 | 1967-01-31 | 2 | Details |
| US3302189A | Manually operable format control unit for the real-time ope… | Expired / Lapsed | 1962-07-02 | 1967-01-31 | 2 | Details |
| US3300017A | Electrosensitive printing apparatus with print head continu… | Expired / Lapsed | 1965-04-30 | 1967-01-24 | 2 | Details |
| US3298000A | Character correlation system | Expired / Lapsed | 1963-10-31 | 1967-01-10 | 2 | Details |
| US3297999A | Multi-programming computer | Expired / Lapsed | 1963-08-26 | 1967-01-10 | 2 | Details |
| US3293512A | Thin film, solid state amplifier with source and drain on o… | Expired / Lapsed | 1963-09-20 | 1966-12-20 | 1 | Details |
| US3291276A | Print head having cup shaped protective member | Expired / Lapsed | 1965-04-30 | 1966-12-13 | 2 | Details |
| US3291974A | Planar function generator using modulo 2 unprimed canonical… | Expired / Lapsed | 1964-12-14 | 1966-12-13 | 2 | Details |
| US3292058A | Thin film controlled emission amplifier | Expired / Lapsed | 1963-06-04 | 1966-12-13 | 2 | Details |
| US3292155A | Computer branch command | Expired / Lapsed | 1963-03-15 | 1966-12-13 | 1 | Details |
| US3292153A | Memory system | Expired / Lapsed | 1962-10-01 | 1966-12-13 | 2 | Details |
| US3292152A | Memory | Expired / Lapsed | 1962-09-17 | 1966-12-13 | 2 | Details |
| US3290661A | Content addressable associative memory with an output compa… | Expired / Lapsed | 1962-11-19 | 1966-12-06 | 2 | Details |
| US3290692A | Magnetic storage disc and drum | Expired / Lapsed | 1962-08-07 | 1966-12-06 | 2 | Details |
| US3290647A | Within-limits comparator | Expired / Lapsed | 1962-05-01 | 1966-12-06 | 2 | Details |
| US3289010A | Shift register | Expired / Lapsed | 1963-11-21 | 1966-11-29 | 1 | Details |
| US3286239A | Automatic interrupt system for a data processor | Expired / Lapsed | 1962-11-30 | 1966-11-15 | 2 | Details |
| US3286236A | Electronic digital computer with automatic interrupt control | Expired / Lapsed | 1962-10-22 | 1966-11-15 | 1 | Details |
| US3283317A | Symbol generators | Expired / Lapsed | 1963-06-14 | 1966-11-01 | 2 | Details |
| US3283255A | Phase modulation system for reading particular information | Expired / Lapsed | 1962-07-05 | 1966-11-01 | 2 | Details |
| US3283303A | Synchronized and coded character recognition system | Expired / Lapsed | 1959-07-17 | 1966-11-01 | 1 | Details |
| US3281831A | Character generator apparatus including function generator … | Expired / Lapsed | 1964-07-02 | 1966-10-25 | 1 | Details |
| US3278906A | Dual channel mode | Expired / Lapsed | 1963-04-01 | 1966-10-11 | 2 | Details |
| US3278733A | Adding and subtracting unit for a digital computer | Expired / Lapsed | 1962-12-10 | 1966-10-11 | 1 | Details |
| US3277243A | Telephone adapter | Expired / Lapsed | 1962-12-19 | 1966-10-04 | 2 | Details |
| US3276273A | Earth's magnetic field responsive apparatus | Expired / Lapsed | 1962-06-25 | 1966-10-04 | 2 | Details |
| US3275989A | Control for digital computers | Expired / Lapsed | 1961-10-02 | 1966-09-27 | 2 | Details |
| US3274562A | Memory apparatus wherein the logical sum of address and dat… | Expired / Lapsed | 1963-01-30 | 1966-09-20 | 2 | Details |
| US3274561A | Data processor input/output control system | Expired / Lapsed | 1962-11-30 | 1966-09-20 | 0 | Details |
| US3274554A | Computer system | Expired / Lapsed | 1961-02-15 | 1966-09-20 | 1 | Details |
| US3272971A | Electronic count accumulator | Expired / Lapsed | 1963-02-05 | 1966-09-13 | 0 | Details |
| US3270399A | Method of fabricating semiconductor devices | Expired / Lapsed | 1962-04-24 | 1966-09-06 | 2 | Details |
| US3270318A | Address checking device | Expired / Lapsed | 1961-03-27 | 1966-08-30 | 2 | Details |
| US3268713A | Electronic counters | Expired / Lapsed | 1963-03-25 | 1966-08-23 | 2 | Details |
| US3267233A | Pneumatic transducer | Expired / Lapsed | 1964-01-31 | 1966-08-16 | 2 | Details |
| US3267293A | Character recognition circuit | Expired / Lapsed | 1963-04-25 | 1966-08-16 | 2 | Details |
| US3266022A | Computer addressing system | Expired / Lapsed | 1962-01-08 | 1966-08-09 | 2 | Details |
| US3266020A | Computer with error recovery | Expired / Lapsed | 1961-09-13 | 1966-08-09 | 2 | Details |
| US3264621A | Magnetic data store | Expired / Lapsed | 1963-03-25 | 1966-08-02 | 1 | Details |
| US3262210A | Control system | Expired / Lapsed | 1963-05-06 | 1966-07-26 | 2 | Details |
| US3263218A | Selective lockout of computer memory | Expired / Lapsed | 1962-06-22 | 1966-07-26 | 2 | Details |
| US3260860A | Pulse shaper | Expired / Lapsed | 1963-10-09 | 1966-07-12 | 2 | Details |
| US3260857A | Multivibrator circuits having a wide range of control | Expired / Lapsed | 1963-07-11 | 1966-07-12 | 2 | Details |
| US3261003A | Tape error indication apparatus | Expired / Lapsed | 1962-06-20 | 1966-07-12 | 2 | Details |
| US3260880A | Electro-optical indicator devices with multiple anodes for … | Expired / Lapsed | 1961-06-06 | 1966-07-12 | 1 | Details |
| US3258024A | Fluid vortex flip-flop | Expired / Lapsed | 1964-02-18 | 1966-06-28 | 2 | Details |
| US3254329A | Computer cycling and control system | Expired / Lapsed | 1961-03-24 | 1966-05-31 | 2 | Details |
| US3253342A | Compensated compass system | Expired / Lapsed | 1961-01-25 | 1966-05-31 | 2 | Details |
| US3253162A | Shift register employing energy transfer between capacitor … | Expired / Lapsed | 1963-11-18 | 1966-05-24 | 2 | Details |
| US3251042A | Digital computer | Expired / Lapsed | 1962-06-14 | 1966-05-10 | 2 | Details |
| US3251040A | Computer input-output system | Expired / Lapsed | 1961-12-01 | 1966-05-10 | 2 | Details |
| US3248554A | Uniform intensity illumination system | Expired / Lapsed | 1961-12-13 | 1966-04-26 | 2 | Details |
| US3248650A | Cathode ray tube indicator for displaying plural input sign… | Expired / Lapsed | 1961-04-19 | 1966-04-26 | 2 | Details |
| US3248692A | Combined comparator and parity checker | Expired / Lapsed | 1961-03-24 | 1966-04-26 | 2 | Details |
| US3248703A | Digital data processor visual display | Expired / Lapsed | 1961-03-24 | 1966-04-26 | 2 | Details |
| US3247391A | Light gun with coaxially positioned elements | Expired / Lapsed | 1962-10-11 | 1966-04-19 | 1 | Details |
| US3247490A | Computer memory system | Expired / Lapsed | 1961-12-19 | 1966-04-19 | 2 | Details |
| US3247488A | Digital computing system | Expired / Lapsed | 1961-03-24 | 1966-04-19 | 1 | Details |
| US3246296A | Character reading apparatus | Expired / Lapsed | 1961-05-03 | 1966-04-12 | 2 | Details |
| US3243606A | Bipolar current signal driver | Expired / Lapsed | 1963-11-21 | 1966-03-29 | 2 | Details |
| US3243580A | Phase modulation reading system | Expired / Lapsed | 1960-12-06 | 1966-03-29 | 1 | Details |
| US3242341A | Electrical safety control | Expired / Lapsed | 1965-06-10 | 1966-03-22 | 2 | Details |
| US3242493A | Runway defining apparatus | Expired / Lapsed | 1962-11-29 | 1966-03-22 | 1 | Details |
| US3239835A | Dme with automatic search velocity control | Expired / Lapsed | 1963-11-12 | 1966-03-08 | 2 | Details |
| US3239798A | Electrical connector for interconnecting printed circuit pa… | Expired / Lapsed | 1963-03-14 | 1966-03-08 | 1 | Details |
| US3239820A | Digital computer with automatic repeating of program segmen… | Expired / Lapsed | 1962-02-16 | 1966-03-08 | 1 | Details |
| US3239836A | Simplified monopulse radar receiver | Expired / Lapsed | 1961-02-28 | 1966-03-08 | 2 | Details |
| US3239816A | Computer indexing system | Expired / Lapsed | 1960-07-25 | 1966-03-08 | 2 | Details |
| US3238389A | Signal responsive apparatus | Expired / Lapsed | 1962-12-17 | 1966-03-01 | 1 | Details |
| US3236707A | Electrical circuitry and method | Expired / Lapsed | 1963-05-24 | 1966-02-22 | 2 | Details |
| US3237169A | Simultaneous read-write addressing | Expired / Lapsed | 1962-06-13 | 1966-02-22 | 2 | Details |
| US3237012A | Photosensitive digitally encoded indicator for use with mec… | Expired / Lapsed | 1962-05-21 | 1966-02-22 | 1 | Details |
| US3234044A | Use of an electron beam for manufacturing conductive patter… | Expired / Lapsed | 1962-09-25 | 1966-02-08 | 2 | Details |
| US3233224A | Data processing system | Expired / Lapsed | 1960-09-15 | 1966-02-01 | 2 | Details |
| US3229626A | High speed printer in electronic computer system | Expired / Lapsed | 1963-04-25 | 1966-01-18 | 2 | Details |
| US3230514A | Selectable word length buffer storage system | Expired / Lapsed | 1961-04-28 | 1966-01-18 | 2 | Details |
| US3229268A | Detachable electromagnetic air bearing transducer | Expired / Lapsed | 1961-04-28 | 1966-01-11 | 2 | Details |
| US3227922A | Electronic indicator circuit | Expired / Lapsed | 1964-11-25 | 1966-01-04 | 2 | Details |
| US3226694A | Interrupt system | Expired / Lapsed | 1962-07-03 | 1965-12-28 | 2 | Details |
| US3226693A | Information reversing method and apparatus | Expired / Lapsed | 1962-05-10 | 1965-12-28 | 2 | Details |
| US3222645A | Magnetic parallel comparison means for comparing a test wor… | Expired / Lapsed | 1962-10-17 | 1965-12-07 | 1 | Details |
| US3222649A | Digital computer with indirect addressing | Expired / Lapsed | 1961-02-13 | 1965-12-07 | 2 | Details |
| US3217640A | Electromagnetic actuating means for wire printers | Expired / Lapsed | 1963-04-30 | 1965-11-16 | 2 | Details |
| US3218478A | Signal responsive apparatus | Expired / Lapsed | 1963-02-28 | 1965-11-16 | 2 | Details |
| US3216676A | Self-adaptive control system | Expired / Lapsed | 1963-05-20 | 1965-11-09 | 2 | Details |
| US3214608A | Voltage level sensing circuit | Expired / Lapsed | 1962-11-19 | 1965-10-26 | 2 | Details |
| US3214739A | Duplex operation of peripheral equipment | Expired / Lapsed | 1962-08-23 | 1965-10-26 | 2 | Details |
| US3214575A | Celestial-inertial navigation system | Expired / Lapsed | 1961-09-14 | 1965-10-26 | 3 | Details |
| US3214738A | Transformer diode shift matrix | Expired / Lapsed | 1961-06-19 | 1965-10-26 | 2 | Details |
| US3214659A | Constant speed control system | Expired / Lapsed | 1952-02-05 | 1965-10-26 | 2 | Details |
| US3213432A | Magnetic core assembly | Expired / Lapsed | 1961-02-23 | 1965-10-19 | 2 | Details |
| US3211088A | Exponential horn printer | Expired / Lapsed | 1962-05-04 | 1965-10-12 | 2 | Details |
| US3212064A | Matrix having thin magnetic film logical gates for transfer… | Expired / Lapsed | 1961-11-27 | 1965-10-12 | 2 | Details |
| US3209268A | Phase modulation read out circuit | Expired / Lapsed | 1962-01-15 | 1965-09-28 | 2 | Details |
| US3209338A | Zero detector for a positioning system | Expired / Lapsed | 1960-08-26 | 1965-09-28 | 1 | Details |
| US3209223A | Servo motor system | Expired / Lapsed | 1948-11-05 | 1965-09-28 | 2 | Details |
| US3207067A | Type carrier for high speed printing mechanism | Expired / Lapsed | 1962-08-21 | 1965-09-21 | 2 | Details |
| US3205295A | Electrical connector | Expired / Lapsed | 1963-03-18 | 1965-09-07 | 1 | Details |
| US3202180A | Fluid pulse generator | Expired / Lapsed | 1963-02-08 | 1965-08-24 | 1 | Details |
| US3202828A | Use of polarizing materials to overcome light leakage | Expired / Lapsed | 1962-07-02 | 1965-08-24 | 2 | Details |
| US3201761A | Indirect addressing system | Expired / Lapsed | 1961-08-17 | 1965-08-17 | 2 | Details |
| US3201592A | Control system for transferring a load from one power sourc… | Expired / Lapsed | 1961-07-24 | 1965-08-17 | 2 | Details |
| US3200361A | Printed circuit board connector assembly | Expired / Lapsed | 1962-07-20 | 1965-08-10 | 1 | Details |
| US3200380A | Data processing system | Expired / Lapsed | 1961-02-16 | 1965-08-10 | 2 | Details |
| US3200379A | Digital computer | Expired / Lapsed | 1961-01-23 | 1965-08-10 | 2 | Details |
| US3197773A | Frequency modulated continuous wave navigation radar | Expired / Lapsed | 1962-04-19 | 1965-07-27 | 2 | Details |
| US3197623A | Decimal adder-accumulator | Expired / Lapsed | 1961-09-15 | 1965-07-27 | 2 | Details |
| US3196429A | Digital to analog continuous rotation servo | Expired / Lapsed | 1961-02-21 | 1965-07-20 | 0 | Details |
| US3195142A | Electrographic recording process and apparatus | Expired / Lapsed | 1958-04-21 | 1965-07-13 | 2 | Details |
| US3193697A | Synchronized single pulser | Expired / Lapsed | 1962-11-06 | 1965-07-06 | 2 | Details |
| US3193789A | Electrical circuitry | Expired / Lapsed | 1962-08-01 | 1965-07-06 | 2 | Details |
| US3192892A | Ion bombardment cleaning and coating apparatus | Expired / Lapsed | 1961-11-24 | 1965-07-06 | 2 | Details |
| US3193669A | Floating point arithmetic circuit | Expired / Lapsed | 1961-04-26 | 1965-07-06 | 1 | Details |
| US3193808A | Digital shift circuit | Expired / Lapsed | 1960-10-13 | 1965-07-06 | 2 | Details |
| US3191611A | "and" gate | Expired / Lapsed | 1963-01-25 | 1965-06-29 | 2 | Details |
| US3191064A | High speed switching circuit | Expired / Lapsed | 1962-08-22 | 1965-06-22 | 1 | Details |
| US3191013A | Phase modulation read out circuit | Expired / Lapsed | 1962-07-23 | 1965-06-22 | 2 | Details |
| US3190128A | Accelerometer | Expired / Lapsed | 1962-02-26 | 1965-06-22 | 0 | Details |
| US3187426A | Method of making printed circuit assemblies | Expired / Lapsed | 1962-03-19 | 1965-06-08 | 2 | Details |
| US3187327A | Multiplex beacon range determining system | Expired / Lapsed | 1959-12-14 | 1965-06-01 | 2 | Details |
| US3184662A | Closed loop servo system with dual channel degenerating fee… | Expired / Lapsed | 1962-07-09 | 1965-05-18 | 2 | Details |
| US3182686A | Transducer | Expired / Lapsed | 1962-03-28 | 1965-05-11 | 1 | Details |
| US3183483A | Error detection apparatus | Expired / Lapsed | 1961-01-16 | 1965-05-11 | 2 | Details |
| US3183495A | Random access magnetic tape memory systems | Expired / Lapsed | 1956-08-31 | 1965-05-11 | 2 | Details |
| US3178705A | Decoders for transponders or the like | Expired / Lapsed | 1961-10-06 | 1965-04-13 | 2 | Details |
| US3177469A | Character recognition | Expired / Lapsed | 1959-08-31 | 1965-04-06 | 2 | Details |
| US3176297A | Antenna systems | Expired / Lapsed | 1962-11-08 | 1965-03-30 | 2 | Details |
| US3175569A | Pure fluid pulse generator | Expired / Lapsed | 1961-12-28 | 1965-03-30 | 2 | Details |
| US3174150A | Self-focusing antenna system | Expired / Lapsed | 1962-06-29 | 1965-03-16 | 1 | Details |
| US3172624A | Automatic appoach system for aircraft | Expired / Lapsed | 1963-07-18 | 1965-03-09 | 2 | Details |
| US3171039A | Flip-flop circuit | Expired / Lapsed | 1960-12-23 | 1965-02-23 | 2 | Details |
| US3171104A | Variable reluctance binary data transducer | Expired / Lapsed | 1959-10-13 | 1965-02-23 | 2 | Details |
| US3170038A | Bidirectional transmission amplifier | Expired / Lapsed | 1961-08-01 | 1965-02-16 | 2 | Details |
| US3170156A | Gain monitoring system for a heightfinding radar | Expired / Lapsed | 1955-12-02 | 1965-02-16 | 2 | Details |
| US3168724A | Computing device incorporating interruptible repeat instruc… | Expired / Lapsed | 1962-01-22 | 1965-02-02 | 1 | Details |
| US3165672A | Printed circuit baseboard | Expired / Lapsed | 1959-06-15 | 1965-01-12 | 2 | Details |
| US3163859A | Code conversion device | Expired / Lapsed | 1962-03-21 | 1964-12-29 | 1 | Details |
| US3163748A | Data checking apparatus | Expired / Lapsed | 1961-11-21 | 1964-12-29 | 2 | Details |
| US3163746A | Mark sensing device | Expired / Lapsed | 1959-07-15 | 1964-12-29 | 2 | Details |
| US3162851A | Single channel monopulse radar receiver | Expired / Lapsed | 1961-02-27 | 1964-12-22 | 2 | Details |
| US3161763A | Electronic digital computer with word field selection | Expired / Lapsed | 1959-01-26 | 1964-12-15 | 2 | Details |
| US3160875A | Magnetic encoder | Expired / Lapsed | 1962-08-01 | 1964-12-08 | 2 | Details |
| US3159793A | Phase modulation reading system employing controlled gating… | Expired / Lapsed | 1963-01-23 | 1964-12-01 | 2 | Details |
| US3159168A | Pneumatic clock | Expired / Lapsed | 1962-02-16 | 1964-12-01 | 2 | Details |
| US3159830A | Method and apparatus for visual presentation of digital and… | Expired / Lapsed | 1961-03-16 | 1964-12-01 | 1 | Details |
| US3159821A | Magnetic core matrix | Expired / Lapsed | 1957-09-25 | 1964-12-01 | 1 | Details |
| US3158758A | Switch apparatus | Expired / Lapsed | 1962-05-14 | 1964-11-24 | 2 | Details |
| US3156399A | Fluid bearing | Expired / Lapsed | 1961-10-23 | 1964-11-10 | 2 | Details |
| US3156907A | Shaft position transducer | Expired / Lapsed | 1959-12-14 | 1964-11-10 | 2 | Details |
| US3155939A | Counter checking circuit | Expired / Lapsed | 1960-10-31 | 1964-11-03 | 1 | Details |
| US3153225A | Data processor with improved subroutine control | Expired / Lapsed | 1961-04-10 | 1964-10-13 | 1 | Details |
| US3151256A | Schmitt trigger having negative set and reset voltage level… | Expired / Lapsed | 1961-08-18 | 1964-09-29 | 2 | Details |
| US3151248A | Photosensitive light gun | Expired / Lapsed | 1960-12-19 | 1964-09-29 | 2 | Details |
| US3151210A | Package for electronic apparatus | Expired / Lapsed | 1960-10-12 | 1964-09-29 | 2 | Details |
| US3151317A | Magnetic stepping circuit | Expired / Lapsed | 1960-10-10 | 1964-09-29 | 2 | Details |
| US3149835A | Document sensing device | Expired / Lapsed | 1962-10-11 | 1964-09-22 | 2 | Details |
| US3148834A | Illumination system | Expired / Lapsed | 1961-11-22 | 1964-09-15 | 2 | Details |
| US3147474A | Information transformation system | Expired / Lapsed | 1962-01-23 | 1964-09-01 | 2 | Details |
| US3145292A | Forward-backward counter | Expired / Lapsed | 1961-04-18 | 1964-08-18 | 2 | Details |
| US3143644A | Control apparatus for digital computers | Expired / Lapsed | 1954-09-09 | 1964-08-04 | 2 | Details |
| US3141999A | Cooling of modular electrical network assemblies | Expired / Lapsed | 1959-06-08 | 1964-07-21 | 1 | Details |
| US3141158A | Magnetic core matrix decoder | Expired / Lapsed | 1960-03-07 | 1964-07-14 | 1 | Details |
| US3141151A | Magnetic tape storage system for digital computers wherein … | Expired / Lapsed | 1959-03-23 | 1964-07-14 | 2 | Details |
| US3140405A | Digital communications system | Expired / Lapsed | 1961-11-13 | 1964-07-07 | 2 | Details |
| US3139521A | Locating data in a magnetic recording system | Expired / Lapsed | 1961-05-05 | 1964-06-30 | 2 | Details |
| US3139531A | Magnetic shift circuits | Expired / Lapsed | 1960-10-11 | 1964-06-30 | 2 | Details |
| US3137453A | Tape loop control | Expired / Lapsed | 1961-11-09 | 1964-06-16 | 2 | Details |
| US3135485A | Monitoring apparatus for control systems | Expired / Lapsed | 1962-06-20 | 1964-06-02 | 0 | Details |
| US3133520A | Automatic turn control system | Expired / Lapsed | 1962-04-17 | 1964-05-19 | 2 | Details |
| US3132520A | Accelerometer | Expired / Lapsed | 1958-04-22 | 1964-05-12 | 2 | Details |
| US3131343A | Control systems whereby the d.c. output voltage can be cont… | Expired / Lapsed | 1961-07-24 | 1964-04-28 | 2 | Details |
| US3130388A | Non-destructive sensing memory | Expired / Lapsed | 1960-05-02 | 1964-04-21 | 1 | Details |
| US3122726A | Recirculating binary data rate converter | Expired / Lapsed | 1958-01-02 | 1964-02-25 | 1 | Details |
| US3120606A | Electronic numerical integrator and computer | Expired / Lapsed | 1947-06-26 | 1964-02-04 | 2 | Details |
| US3119950A | Counter circuit with diode matrix feeding signals to transi… | Expired / Lapsed | 1962-03-22 | 1964-01-28 | 1 | Details |
| US3117280A | Timing signal receiver | Expired / Lapsed | 1962-04-17 | 1964-01-07 | 2 | Details |
| US3117317A | Distance measuring circuit | Expired / Lapsed | 1959-05-25 | 1964-01-07 | 1 | Details |
| US3114841A | Photo electric card reading system | Expired / Lapsed | 1961-06-02 | 1963-12-17 | 2 | Details |
| US3113248A | Electrical assembly of modules | Expired / Lapsed | 1960-07-13 | 1963-12-03 | 2 | Details |
| US3113298A | Magnetically recorded data and system for reading same | Expired / Lapsed | 1958-10-16 | 1963-12-03 | 1 | Details |
| US3111647A | Character reading system | Expired / Lapsed | 1960-06-21 | 1963-11-19 | 1 | Details |
| US3109924A | Record handling and reading apparatus | Expired / Lapsed | 1962-03-12 | 1963-11-05 | 2 | Details |
| US3109988A | Electromagnetic radiation monitor utilizing means responsiv… | Expired / Lapsed | 1961-08-04 | 1963-11-05 | 2 | Details |
| US3108647A | Self-correcting weighing machine and method | Expired / Lapsed | 1961-10-31 | 1963-10-29 | 2 | Details |
| US3107514A | Aircraft heading alignment apparatus and method | Expired / Lapsed | 1961-12-26 | 1963-10-22 | 4 | Details |
| US3107089A | Sheet side registration apparatus | Expired / Lapsed | 1961-02-27 | 1963-10-15 | 2 | Details |
| US3105928A | Self-optimizing servomechanisms | Expired / Lapsed | 1961-04-28 | 1963-10-01 | 2 | Details |
| US3105955A | Error checking device | Expired / Lapsed | 1956-03-28 | 1963-10-01 | 2 | Details |
| US3105224A | Switching circuit in a matrix arrangement utilizing transis… | Expired / Lapsed | 1957-08-06 | 1963-09-24 | 2 | Details |
| US3103646A | Voltage comparison circuit | Expired / Lapsed | 1959-01-29 | 1963-09-10 | 2 | Details |
| US3103617A | Voltage regulation with temperature compensation | Expired / Lapsed | 1958-05-06 | 1963-09-10 | 2 | Details |
| US3099795A | Phase coded communication system | Expired / Lapsed | 1957-04-03 | 1963-07-30 | 2 | Details |
| US3097307A | Opposite conducting type transistor control circuits | Expired / Lapsed | 1955-07-06 | 1963-07-09 | 2 | Details |
| US3096482A | Phase coded signal receiver | Expired / Lapsed | 1957-04-11 | 1963-07-02 | 2 | Details |
| US3094696A | Phase coder alignment system | Expired / Lapsed | 1957-04-24 | 1963-06-18 | 2 | Details |
| US3093751A | Logical circuits | Expired / Lapsed | 1959-08-14 | 1963-06-11 | 0 | Details |
| US3092510A | Magnetic devices and preparation thereof | Expired / Lapsed | 1959-03-02 | 1963-06-04 | 2 | Details |
| US3092812A | Non-destructive sensing of thin film magnetic cores | Expired / Lapsed | 1957-05-10 | 1963-06-04 | 2 | Details |
| US3091751A | Computing device for optical landing systems | Expired / Lapsed | 1959-05-05 | 1963-05-28 | 1 | Details |
| US3090944A | Timing pulse generator | Expired / Lapsed | 1958-09-12 | 1963-05-21 | 2 | Details |
| US3090953A | Pulse burst compression radar | Expired / Lapsed | 1956-09-27 | 1963-05-21 | 2 | Details |
| US3087333A | Inertial navigation system | Expired / Lapsed | 1956-11-30 | 1963-04-30 | 2 | Details |
| US3087030A | Magnetically controlled commutator devices | Expired / Lapsed | 1960-06-03 | 1963-04-23 | 2 | Details |
| US3087026A | Boundary displacement magnetic recording apparatus | Expired / Lapsed | 1952-09-17 | 1963-04-23 | 1 | Details |
| US3085229A | Card-to-tape converter | Expired / Lapsed | 1955-06-13 | 1963-04-09 | 2 | Details |
| US3080555A | Function generator | Expired / Lapsed | 1958-06-12 | 1963-03-05 | 4 | Details |
| US3079086A | Voltage accumulator circuit | Expired / Lapsed | 1961-09-06 | 1963-02-26 | 2 | Details |
| US3077722A | Hitch | Expired / Lapsed | 1959-02-09 | 1963-02-19 | 2 | Details |
| US3077553A | Servo system having accelerometer responsive filtering of s… | Expired / Lapsed | 1960-10-25 | 1963-02-12 | 2 | Details |
| US3077557A | Flight path computer | Expired / Lapsed | 1960-09-30 | 1963-02-12 | 1 | Details |
| US3077110A | System for monitoring the take-off performance of an aircra… | Expired / Lapsed | 1959-06-29 | 1963-02-12 | 2 | Details |
| US3076958A | Memory search apparatus | Expired / Lapsed | 1959-11-24 | 1963-02-05 | 1 | Details |
| US3076393A | Electrostatic page printer | Expired / Lapsed | 1959-05-18 | 1963-02-05 | 2 | Details |
| US3074033A | Microwave frequency separator | Expired / Lapsed | 1957-02-26 | 1963-01-15 | 2 | Details |
| US3071959A | Method of measuring and compensating for deviation error in… | Expired / Lapsed | 1961-01-25 | 1963-01-08 | 2 | Details |
| US3072902A | V-beam radar system | Expired / Lapsed | 1960-01-04 | 1963-01-08 | 2 | Details |
| US3071753A | Data processing system with remote input-output device | Expired / Lapsed | 1958-04-17 | 1963-01-01 | 1 | Details |
| FR1313414A | Method for measuring and compensating for deviation errors … | Expired / Lapsed | 1962-01-16 | 1962-12-28 | 0 | Details |
| US3070333A | Aircraft altitude control system | Expired / Lapsed | 1961-01-06 | 1962-12-25 | 0 | Details |
| US3070729A | Modularized electrical network assembly | Expired / Lapsed | 1960-03-30 | 1962-12-25 | 0 | Details |
| US3070783A | Non-destructive sensing system | Expired / Lapsed | 1959-11-24 | 1962-12-25 | 0 | Details |
| US3069666A | Magnetic tape storage system | Expired / Lapsed | 1956-11-02 | 1962-12-18 | 0 | Details |
| US3068367A | Pulse train gap detector circuitry | Expired / Lapsed | 1959-09-08 | 1962-12-11 | 0 | Details |
| US3065105A | Process and apparatus for producing magnetic material and r… | Expired / Lapsed | 1958-06-12 | 1962-11-20 | 2 | Details |
| US3064242A | Magnetic record sensing apparatus | Expired / Lapsed | 1957-04-11 | 1962-11-13 | 0 | Details |
| US3060409A | Analog system | Expired / Lapsed | 1956-01-31 | 1962-10-23 | 0 | Details |
| US3058104A | Decoder-indicator | Expired / Lapsed | 1959-11-02 | 1962-10-09 | 0 | Details |
| US3058043A | Electrical controller for fuel ratio control system | Expired / Lapsed | 1958-09-04 | 1962-10-09 | 0 | Details |
| US3053449A | Electronic computer system | Expired / Lapsed | 1955-03-04 | 1962-09-11 | 0 | Details |
| US3052129A | Gyroscopic reference system | Expired / Lapsed | 1960-10-13 | 1962-09-04 | 0 | Details |
| US3051852A | Transistorized circuit breaker network | Expired / Lapsed | 1958-11-19 | 1962-08-28 | 0 | Details |
| US3051848A | Shift register using bidirectional pushpull gates whose out… | Expired / Lapsed | 1957-06-03 | 1962-08-28 | 0 | Details |
| US3050714A | Shift register | Expired / Lapsed | 1959-06-19 | 1962-08-21 | 0 | Details |
| US3050717A | Computer shift control circuits | Expired / Lapsed | 1956-08-07 | 1962-08-21 | 0 | Details |
| US3049702A | Single target height indicator | Expired / Lapsed | 1958-05-15 | 1962-08-14 | 0 | Details |
| US3049294A | Velocity and distance indicating system | Expired / Lapsed | 1957-01-23 | 1962-08-14 | 0 | Details |
| US3045211A | Bistable circuits | Expired / Lapsed | 1952-08-01 | 1962-07-17 | 0 | Details |
| US3039009A | Transistor amplifiers for pulse signals | Expired / Lapsed | 1958-01-27 | 1962-06-12 | 0 | Details |
| US3039080A | Encoding device | Expired / Lapsed | 1956-07-27 | 1962-06-12 | 0 | Details |
| US3038088A | Transistor switch having compensating means for thermal eff… | Expired / Lapsed | 1959-03-13 | 1962-06-05 | 0 | Details |
| US3037289A | Directional reference correction system | Expired / Lapsed | 1953-07-07 | 1962-06-05 | 0 | Details |
| US3033994A | Resettable delay flop having blocking oscillator whose cond… | Expired / Lapsed | 1960-05-13 | 1962-05-08 | 0 | Details |
| US3034096A | Take-off monitoring apparatus for aircraft | Expired / Lapsed | 1956-10-01 | 1962-05-08 | 0 | Details |
| US3033035A | Compound aircraft instrument | Expired / Lapsed | 1956-08-10 | 1962-05-08 | 0 | Details |
| US3032246A | Tape guide | Expired / Lapsed | 1957-10-18 | 1962-05-01 | 0 | Details |
| US3030612A | Magnetic apparatus and methods | Expired / Lapsed | 1956-12-07 | 1962-04-17 | 0 | Details |
| US3026029A | Data processing code card | Expired / Lapsed | 1958-04-30 | 1962-03-20 | 0 | Details |
| US3023965A | Semi-conductor adder | Expired / Lapsed | 1959-02-27 | 1962-03-06 | 0 | Details |
| US3023402A | Magnetic data store | Expired / Lapsed | 1959-01-28 | 1962-02-27 | 0 | Details |
| US3023401A | Reversible shift register | Expired / Lapsed | 1958-09-23 | 1962-02-27 | 0 | Details |
| US3023070A | Atmosphere for electrographic printing | Expired / Lapsed | 1957-05-20 | 1962-02-27 | 0 | Details |
| US3021937A | Selective interlock mechanism | Expired / Lapsed | 1960-04-12 | 1962-02-20 | 0 | Details |
| US3020800A | Photographic summation system | Expired / Lapsed | 1957-12-26 | 1962-02-13 | 0 | Details |
| US3021067A | Time-sharing computer | Expired / Lapsed | 1957-01-14 | 1962-02-13 | 0 | Details |
| US3016534A | Dual function antenna | Expired / Lapsed | 1960-07-01 | 1962-01-09 | 0 | Details |
| US3016469A | Multistable circuit | Expired / Lapsed | 1958-12-15 | 1962-01-09 | 0 | Details |
| US3016530A | Radar object positional indicator | Expired / Lapsed | 1946-11-14 | 1962-01-09 | 0 | Details |
| US3015807A | Non-destructive sensing of a magnetic core | Expired / Lapsed | 1957-10-23 | 1962-01-02 | 0 | Details |
| US3014660A | Address selection means | Expired / Lapsed | 1956-10-01 | 1961-12-26 | 0 | Details |
| US3012839A | Electrographic printer | Expired / Lapsed | 1954-07-15 | 1961-12-12 | 0 | Details |
| US3012232A | High speed printer | Expired / Lapsed | 1953-01-27 | 1961-12-05 | 0 | Details |
| US3009070A | Bi-directional current driver | Expired / Lapsed | 1958-12-30 | 1961-11-14 | 0 | Details |
| US3007637A | Coarse-fine counter | Expired / Lapsed | 1960-03-22 | 1961-11-07 | 0 | Details |
| US3008077A | Adaptive autopilot servo system | Expired / Lapsed | 1960-01-06 | 1961-11-07 | 0 | Details |
| US3008075A | Phase stabilizing circuit | Expired / Lapsed | 1959-05-04 | 1961-11-07 | 0 | Details |
| US3008125A | Signal identification and alignment system | Expired / Lapsed | 1957-07-08 | 1961-11-07 | 0 | Details |
| US3008055A | Bistable circuits having unidirectional feedback means | Expired / Lapsed | 1955-03-29 | 1961-11-07 | 0 | Details |
| US3004244A | Digital circuit using magnetic core elements | Expired / Lapsed | 1957-12-23 | 1961-10-10 | 0 | Details |
| US3004251A | Digital-to-analogue converter | Expired / Lapsed | 1957-10-10 | 1961-10-10 | 0 | Details |
| US3001708A | Central control circuit for computers | Expired / Lapsed | 1959-01-26 | 1961-09-26 | 0 | Details |
| US3001102A | Integrated plug-in unit | Expired / Lapsed | 1958-11-12 | 1961-09-19 | 0 | Details |
| US3000556A | Data conversion system | Expired / Lapsed | 1957-06-26 | 1961-09-19 | 0 | Details |
| US3000555A | Digital computer input | Expired / Lapsed | 1955-03-04 | 1961-09-19 | 0 | Details |
| US3001180A | Data revolving | Expired / Lapsed | 1954-08-23 | 1961-09-19 | 0 | Details |
| US2999968A | Switching circuit for nonlinear servo integral compensation | Expired / Lapsed | 1959-10-19 | 1961-09-12 | 0 | Details |
| US2998727A | Heading reference system for navigable craft | Expired / Lapsed | 1959-03-24 | 1961-09-05 | 0 | Details |
| US2997233A | Combined shift register and counter circuit | Expired / Lapsed | 1954-06-28 | 1961-08-22 | 0 | Details |
| US2996706A | Apparatus for computing and predicting varying conditions f… | Expired / Lapsed | 1953-05-29 | 1961-08-15 | 0 | Details |
| US2995751A | Multivibrator r. d. f. adapter | Expired / Lapsed | 1959-07-20 | 1961-08-08 | 0 | Details |
| US2995364A | Item feeding and aligning apparatus | Expired / Lapsed | 1958-11-17 | 1961-08-08 | 0 | Details |
| US2995302A | Reversible digital resolver | Expired / Lapsed | 1958-07-21 | 1961-08-08 | 0 | Details |
| US2995631A | Magnetic reading device | Expired / Lapsed | 1951-10-25 | 1961-08-08 | 0 | Details |
| US2992416A | Pulse control system | Expired / Lapsed | 1957-01-09 | 1961-07-11 | 0 | Details |
| US2992409A | Transistor selection array and drive system | Expired / Lapsed | 1955-08-09 | 1961-07-11 | 0 | Details |
| US2991464A | Azimuth target gating system | Expired / Lapsed | 1958-10-07 | 1961-07-04 | 0 | Details |
| US2991414A | Electrical apparatus | Expired / Lapsed | 1957-09-26 | 1961-07-04 | 0 | Details |
| US2991452A | Pulse group synchronizers | Expired / Lapsed | 1956-03-02 | 1961-07-04 | 0 | Details |
| US2991460A | Data handling and conversion | Expired / Lapsed | 1954-08-19 | 1961-07-04 | 0 | Details |
| US2990310A | Laminated printed circuit board | Expired / Lapsed | 1960-05-11 | 1961-06-27 | 2 | Details |
| US2990116A | Electromechanical analog integrating device | Expired / Lapsed | 1957-06-24 | 1961-06-27 | 0 | Details |
| US2989729A | Keyboard checking apparatus | Expired / Lapsed | 1958-12-10 | 1961-06-20 | 0 | Details |
| US2988737A | Analog-to-digital converter | Expired / Lapsed | 1958-12-30 | 1961-06-13 | 0 | Details |
| US2986966A | Stabilized optical system | Expired / Lapsed | 1958-12-15 | 1961-06-06 | 0 | Details |
| US2987629A | Voltage comparator | Expired / Lapsed | 1957-07-10 | 1961-06-06 | 0 | Details |
| US2987050A | Compensated flow control valve | Expired / Lapsed | 1957-04-29 | 1961-06-06 | 0 | Details |
| US2987627A | Neutralization of interelectrode capacitance in transistor … | Expired / Lapsed | 1956-09-26 | 1961-06-06 | 0 | Details |
| US2984831A | Voltage converter to digital code | Expired / Lapsed | 1960-05-04 | 1961-05-16 | 0 | Details |
| US2981853A | Reference pulse generation | Expired / Lapsed | 1959-12-04 | 1961-04-25 | 0 | Details |
| US2981941A | Selective optical screen and system | Expired / Lapsed | 1956-08-22 | 1961-04-25 | 0 | Details |
| US2981140A | Multiple image display system | Expired / Lapsed | 1956-04-24 | 1961-04-25 | 0 | Details |
| US2980900A | Synchro encoder | Expired / Lapsed | 1957-08-21 | 1961-04-18 | 0 | Details |
| US2976510A | Wrench for printed circuit card library rack | Expired / Lapsed | 1957-05-02 | 1961-03-21 | 0 | Details |
| US2975966A | Coded document reader | Expired / Lapsed | 1956-04-09 | 1961-03-21 | 0 | Details |
| US2976174A | Oriented magnetic cores | Expired / Lapsed | 1955-03-22 | 1961-03-21 | 2 | Details |
| US2973927A | Monitoring device for automatic pilot systems | Expired / Lapsed | 1956-11-21 | 1961-03-07 | 0 | Details |
| US2973438A | Ring counter | Expired / Lapsed | 1956-12-20 | 1961-02-28 | 0 | Details |
| US2972710A | Inductive load transistor bridge switching circuit | Expired / Lapsed | 1959-04-03 | 1961-02-21 | 0 | Details |
| US2972128A | Phase modulated pulse recording systems | Expired / Lapsed | 1956-07-30 | 1961-02-14 | 0 | Details |
| US2972127A | Error responsive system | Expired / Lapsed | 1954-12-27 | 1961-02-14 | 0 | Details |
| US2970759A | Absolute value reversible counter | Expired / Lapsed | 1957-05-14 | 1961-02-07 | 0 | Details |
| US2970763A | Predetermined pulse selector | Expired / Lapsed | 1957-02-28 | 1961-02-07 | 0 | Details |
| US2970303A | Neon lamp indicator device | Expired / Lapsed | 1955-03-04 | 1961-01-31 | 0 | Details |
| US2970293A | Binary counter | Expired / Lapsed | 1954-05-10 | 1961-01-31 | 0 | Details |
| US2969529A | Magnetic read-write head having two gaps | Expired / Lapsed | 1957-05-17 | 1961-01-24 | 0 | Details |
| US2969537A | Target discriminating radar system | Expired / Lapsed | 1957-05-07 | 1961-01-24 | 0 | Details |
| US2969538A | Dual purpose navigation system | Expired / Lapsed | 1956-12-13 | 1961-01-24 | 0 | Details |
| US2969525A | Locating information | Expired / Lapsed | 1954-05-20 | 1961-01-24 | 0 | Details |
| US2968997A | Cross connected servo mechanism for a turret gun directing … | Expired / Lapsed | 1947-05-09 | 1961-01-24 | 0 | Details |
| US2968803A | Fixed-periodicity monitoring and control system | Expired / Lapsed | 1957-01-31 | 1961-01-17 | 0 | Details |
| US2967082A | Electrographic plotter | Expired / Lapsed | 1955-05-20 | 1961-01-03 | 0 | Details |
| US2966599A | Electronic logic circuit | Expired / Lapsed | 1958-10-27 | 1960-12-27 | 0 | Details |
| US2966591A | Object detection and tracking system | Expired / Lapsed | 1956-05-09 | 1960-12-27 | 0 | Details |
| US2966597A | Transistor amplifier and pulse shaper | Expired / Lapsed | 1955-07-28 | 1960-12-27 | 0 | Details |
| US2963656A | Temperature stable transistor amplifier | Expired / Lapsed | 1959-05-26 | 1960-12-06 | 0 | Details |
| US2962698A | Visual indicator system | Expired / Lapsed | 1958-05-23 | 1960-11-29 | 0 | Details |
| US2961535A | Automatic delay compensation | Expired / Lapsed | 1957-11-27 | 1960-11-22 | 0 | Details |
| US2961619A | Microwave filter | Expired / Lapsed | 1957-06-21 | 1960-11-22 | 0 | Details |
| US2961584A | Magnetic core package | Expired / Lapsed | 1956-06-08 | 1960-11-22 | 0 | Details |
| US2960681A | Transistor function tables | Expired / Lapsed | 1955-08-05 | 1960-11-15 | 0 | Details |
| US2960684A | Magnetic counter | Expired / Lapsed | 1952-12-03 | 1960-11-15 | 0 | Details |
| US2959687A | Switching devices | Expired / Lapsed | 1956-09-21 | 1960-11-08 | 0 | Details |
| US2959638A | Magnetic printer | Expired / Lapsed | 1955-06-03 | 1960-11-08 | 0 | Details |
| US2958014A | Interlocking systems | Expired / Lapsed | 1957-02-12 | 1960-10-25 | 0 | Details |
| US2956745A | Subtract counter | Expired / Lapsed | 1958-09-29 | 1960-10-18 | 0 | Details |
| US2954731A | Electronically controlled high speed printer | Expired / Lapsed | 1958-09-17 | 1960-10-04 | 0 | Details |
| US2953327A | Stall prevention system for aircraft | Expired / Lapsed | 1955-12-29 | 1960-09-20 | 0 | Details |
| US2952846A | Missile velocity indicating system | Expired / Lapsed | 1957-04-17 | 1960-09-13 | 0 | Details |
| US2951985A | Apparatus for monitoring a recurring pulse group | Expired / Lapsed | 1954-09-28 | 1960-09-06 | 0 | Details |
| US2950005A | Card sorter | Expired / Lapsed | 1956-08-10 | 1960-08-23 | 0 | Details |
| US2948496A | Speed controlling system for aircraft | Expired / Lapsed | 1957-01-09 | 1960-08-09 | 0 | Details |
| US2948494A | Control systems for dirigible craft | Expired / Lapsed | 1954-01-13 | 1960-08-09 | 0 | Details |
| US2947982A | Servo drive system with dynamic error elimination | Expired / Lapsed | 1955-08-16 | 1960-08-02 | 0 | Details |
| US2947945A | Time domain filter | Expired / Lapsed | 1954-11-05 | 1960-08-02 | 0 | Details |
| US2945965A | Complementing flip-flops | Expired / Lapsed | 1956-12-20 | 1960-07-19 | 0 | Details |
| US2944121A | Switching apparatus | Expired / Lapsed | 1959-03-20 | 1960-07-05 | 0 | Details |
| US2944037A | Ink-transfer compositions and duplicating media prepared th… | Expired / Lapsed | 1956-07-19 | 1960-07-05 | 2 | Details |
| US2943303A | Visual indicating signal monitoring system | Expired / Lapsed | 1955-08-01 | 1960-06-28 | 0 | Details |
| US2941311A | Optical radar simulator | Expired / Lapsed | 1958-02-26 | 1960-06-21 | 0 | Details |
| US2938666A | Record sensing means | Expired / Lapsed | 1955-10-07 | 1960-05-31 | 0 | Details |
| US2938193A | Code generator | Expired / Lapsed | 1955-06-10 | 1960-05-24 | 0 | Details |
| US2937808A | Radar mach meter and angle of attack or yaw meter | Expired / Lapsed | 1955-01-17 | 1960-05-24 | 0 | Details |
| US2937366A | Pulse group synchronizer | Expired / Lapsed | 1956-02-06 | 1960-05-17 | 0 | Details |
| US2936627A | Vertical and velocity reference defining system | Expired / Lapsed | 1956-01-03 | 1960-05-17 | 0 | Details |
| US2936134A | Longitudinal axis control system for aircraft | Expired / Lapsed | 1956-03-15 | 1960-05-10 | 0 | Details |
| US2935739A | Multi-aperture core storage circuit | Expired / Lapsed | 1958-06-12 | 1960-05-03 | 0 | Details |
| US2935609A | Pre-trigger generator | Expired / Lapsed | 1957-08-21 | 1960-05-03 | 0 | Details |
| US2934758A | Radar system evaluator | Expired / Lapsed | 1955-10-24 | 1960-04-26 | 0 | Details |
| US2933252A | Binary adder-subtracter with command carry control | Expired / Lapsed | 1956-12-19 | 1960-04-19 | 0 | Details |
| US2933678A | Method and apparatus for calibrating a magnetic medium | Expired / Lapsed | 1956-06-15 | 1960-04-19 | 0 | Details |
| US2933598A | Automatic frequency control circuit | Expired / Lapsed | 1956-03-28 | 1960-04-19 | 0 | Details |
| US2932816A | Keyboard transmitter | Expired / Lapsed | 1958-05-19 | 1960-04-12 | 0 | Details |
| US2931017A | Drive systems for magnetic core memories | Expired / Lapsed | 1955-09-28 | 1960-03-29 | 0 | Details |
| US2930004A | Microwave pulser | Expired / Lapsed | 1955-07-01 | 1960-03-22 | 0 | Details |
| FR1211792A | Pneumatic device for positioning a recording element | Expired / Lapsed | 1958-10-09 | 1960-03-18 | 0 | Details |
| US2928338A | Wire printing mechanism | Expired / Lapsed | 1954-04-15 | 1960-03-15 | 0 | Details |
| US2928080A | Static memory system | Expired / Lapsed | 1958-07-16 | 1960-03-08 | 0 | Details |
| US2928011A | Bistable circuits | Expired / Lapsed | 1958-02-20 | 1960-03-08 | 0 | Details |
| US2927733A | Gating circuits | Expired / Lapsed | 1958-02-20 | 1960-03-08 | 0 | Details |
| US2927216A | Photometric character recognition device | Expired / Lapsed | 1957-12-19 | 1960-03-01 | 0 | Details |
| US2927223A | Temperature compensated limiter circuits | Expired / Lapsed | 1957-11-27 | 1960-03-01 | 0 | Details |
| US2926602A | Automatic printer | Expired / Lapsed | 1957-05-20 | 1960-03-01 | 0 | Details |
| US2927242A | Transistor driven pulse circuit | Expired / Lapsed | 1956-06-08 | 1960-03-01 | 0 | Details |
| US2927304A | Magnetic head switching system | Expired / Lapsed | 1954-03-01 | 1960-03-01 | 0 | Details |
| US2926340A | Edge connectors | Expired / Lapsed | 1956-01-26 | 1960-02-23 | 0 | Details |
| US2924977A | Rotor dynamic unbalance analyzing system | Expired / Lapsed | 1955-08-31 | 1960-02-16 | 0 | Details |
| US2923877A | Feedback with half wave circuit | Expired / Lapsed | 1956-12-17 | 1960-02-02 | 0 | Details |
| US2923833A | Selection system | Expired / Lapsed | 1955-04-26 | 1960-02-02 | 0 | Details |
| US2921193A | Voltage regulators | Expired / Lapsed | 1956-09-21 | 1960-01-12 | 0 | Details |
| US2921190A | Serial coincidence detector | Expired / Lapsed | 1954-08-23 | 1960-01-12 | 0 | Details |
| US2919171A | Page printing apparatus | Expired / Lapsed | 1957-02-27 | 1959-12-29 | 0 | Details |
| US2918580A | Electrographic printing head | Expired / Lapsed | 1958-05-09 | 1959-12-22 | 0 | Details |
| US2918658A | Format control for high speed printers | Expired / Lapsed | 1956-02-28 | 1959-12-22 | 0 | Details |
| US2918584A | Light responsive electrical device | Expired / Lapsed | 1955-10-20 | 1959-12-22 | 0 | Details |
| US2917996A | Thermal printer | Expired / Lapsed | 1955-04-25 | 1959-12-22 | 0 | Details |
| US2915967A | Information reproducing system | Expired / Lapsed | 1958-08-06 | 1959-12-08 | 0 | Details |
| US2915966A | High speed printer | Expired / Lapsed | 1955-06-13 | 1959-12-08 | 0 | Details |
| US2916210A | Apparatus for selectively modifying program information | Expired / Lapsed | 1954-07-30 | 1959-12-08 | 0 | Details |
| US2916712A | Microwave diplexer | Expired / Lapsed | 1954-07-09 | 1959-12-08 | 0 | Details |
| US2915686A | Diode matrix | Expired / Lapsed | 1958-08-28 | 1959-12-01 | 0 | Details |
| US2914752A | Information storage system | Expired / Lapsed | 1955-05-09 | 1959-11-24 | 0 | Details |
| US2913593A | Half-adder for computers | Expired / Lapsed | 1954-04-15 | 1959-11-17 | 0 | Details |
| US2912637A | Electronic voltage regulator | Expired / Lapsed | 1957-09-30 | 1959-11-10 | 0 | Details |
| US2911085A | Wire printer with oscillatory print head | Expired / Lapsed | 1957-07-01 | 1959-11-03 | 0 | Details |
| US2911626A | One core per bit shift register | Expired / Lapsed | 1955-06-08 | 1959-11-03 | 0 | Details |
| US2910672A | Magnetic memory unit | Expired / Lapsed | 1956-04-05 | 1959-10-27 | 0 | Details |
| US2910238A | Inventory digital storage and computation apparatus | Expired / Lapsed | 1951-11-13 | 1959-10-27 | 0 | Details |
| US2907896A | Pulse generating circuit | Expired / Lapsed | 1956-02-13 | 1959-10-06 | 0 | Details |
| US2907524A | Conditional stop control apparatus | Expired / Lapsed | 1954-06-01 | 1959-10-06 | 0 | Details |
| US2907000A | Double base diode memory | Expired / Lapsed | 1955-08-05 | 1959-09-29 | 0 | Details |
| US2907006A | Shifting register with inductive intermediate storage | Expired / Lapsed | 1955-01-21 | 1959-09-29 | 0 | Details |
| US2905894A | Gated spectrum analyzer | Expired / Lapsed | 1954-12-30 | 1959-09-22 | 0 | Details |
| US2904683A | Phase demodulation | Expired / Lapsed | 1956-10-23 | 1959-09-15 | 0 | Details |
| US2904698A | Photocell actuated systems | Expired / Lapsed | 1953-04-03 | 1959-09-15 | 0 | Details |
| US2902547A | Transistor controlled magnetic amplifier | Expired / Lapsed | 1954-12-01 | 1959-09-01 | 0 | Details |
| US2901737A | Disk recording compensating devices | Expired / Lapsed | 1955-11-01 | 1959-08-25 | 0 | Details |
| US2901735A | Magnetic amplifier drive for coincident current switch | Expired / Lapsed | 1955-04-29 | 1959-08-25 | 0 | Details |
| US2901636A | Magnetic amplifier | Expired / Lapsed | 1955-04-07 | 1959-08-25 | 0 | Details |
| US2900282A | Method of treating magnetic material and resulting articles | Expired / Lapsed | 1956-07-20 | 1959-08-18 | 2 | Details |
| US2900506A | Phase detector | Expired / Lapsed | 1955-05-13 | 1959-08-18 | 0 | Details |
| US2898576A | Character recognition apparatus | Expired / Lapsed | 1953-12-04 | 1959-08-04 | 0 | Details |
| US2896848A | Magnetic core shift register counter | Expired / Lapsed | 1954-10-08 | 1959-07-28 | 0 | Details |
| US2895670A | Flight analyzer | Expired / Lapsed | 1956-07-27 | 1959-07-21 | 0 | Details |
| US2896145A | Flight path angle control systems | Expired / Lapsed | 1956-03-13 | 1959-07-21 | 0 | Details |
| US2894248A | Border follower system | Expired / Lapsed | 1957-05-06 | 1959-07-07 | 0 | Details |
| US2894247A | Character recognition device | Expired / Lapsed | 1953-12-04 | 1959-07-07 | 0 | Details |
| US2892948A | Positional control system for photoscanner | Expired / Lapsed | 1956-04-10 | 1959-06-30 | 0 | Details |
| US2892936A | Delay circuit | Expired / Lapsed | 1955-11-04 | 1959-06-30 | 0 | Details |
| US2892188A | Framing circuit for loran receivers | Expired / Lapsed | 1956-01-12 | 1959-06-23 | 0 | Details |
| US2892099A | Semi-conductor adder | Expired / Lapsed | 1953-12-31 | 1959-06-23 | 0 | Details |
| US2892183A | Coincidence control apparatus | Expired / Lapsed | 1953-11-09 | 1959-06-23 | 0 | Details |
| US2890829A | Logical binary powering circuits | Expired / Lapsed | 1956-10-08 | 1959-06-16 | 0 | Details |
| US2889468A | Binary-coded decade counter | Expired / Lapsed | 1955-03-14 | 1959-06-02 | 0 | Details |
| US2889491A | Tape storage bin | Expired / Lapsed | 1954-10-22 | 1959-06-02 | 0 | Details |
| US2887872A | Method of measuring and compensating for deviation errors f… | Expired / Lapsed | 1956-02-23 | 1959-05-26 | 0 | Details |
| US2887873A | Method of measuring and compensating for deviation errors i… | Expired / Lapsed | 1956-02-23 | 1959-05-26 | 0 | Details |
| US2887783A | Azimuth reference device | Expired / Lapsed | 1953-12-24 | 1959-05-26 | 0 | Details |
| US2888674A | Dual lens antenna for tracking and searching | Expired / Lapsed | 1951-03-20 | 1959-05-26 | 0 | Details |
| US2886705A | Wideband microwave discriminator | Expired / Lapsed | 1958-02-25 | 1959-05-12 | 0 | Details |
| US2885232A | Coupling | Expired / Lapsed | 1958-02-05 | 1959-05-05 | 0 | Details |
| US2884829A | Auxiliary optical systems for use with computing gun sights | Expired / Lapsed | 1955-01-14 | 1959-05-05 | 0 | Details |
| US2884615A | Pulse coded signal separator | Expired / Lapsed | 1957-02-12 | 1959-04-28 | 0 | Details |
| US2882525A | Unusual indicator presentation system | Expired / Lapsed | 1955-09-22 | 1959-04-14 | 0 | Details |
| US2881412A | Shift registers | Expired / Lapsed | 1954-04-29 | 1959-04-07 | 0 | Details |
| US2881423A | Pilot pulse system for monopulse comparator | Expired / Lapsed | 1953-07-10 | 1959-04-07 | 0 | Details |
| US2880181A | Binder for conductive metallic film | Expired / Lapsed | 1956-11-02 | 1959-03-31 | 1 | Details |
| US2878435A | Servosystem with low impedance stabilization network | Expired / Lapsed | 1956-10-19 | 1959-03-17 | 0 | Details |
| US2877451A | Diode switching circuits | Expired / Lapsed | 1955-05-12 | 1959-03-10 | 0 | Details |
| FR1174118A | Transistor rocker circuit | Expired / Lapsed | 1957-04-04 | 1959-03-06 | 0 | Details |
| US2876350A | Coding system | Expired / Lapsed | 1955-05-26 | 1959-03-03 | 0 | Details |
| US2876438A | Regenerative shift register | Expired / Lapsed | 1955-01-20 | 1959-03-03 | 0 | Details |
| US2876348A | Synchronizing circuits | Expired / Lapsed | 1954-03-18 | 1959-03-03 | 0 | Details |
| US2876058A | Magnetic recording system | Expired / Lapsed | 1953-05-15 | 1959-03-03 | 0 | Details |
| US2875412A | Pulse width modulator | Expired / Lapsed | 1956-11-20 | 1959-02-24 | 0 | Details |
| US2875439A | Center-fed annular scanning antenna | Expired / Lapsed | 1956-01-26 | 1959-02-24 | 0 | Details |
| US2874372A | Magnetic core devices | Expired / Lapsed | 1955-11-15 | 1959-02-17 | 0 | Details |
| US2873666A | High speed printer | Expired / Lapsed | 1955-06-16 | 1959-02-17 | 0 | Details |
| US2874352A | Electro-mechanical phase shifter | Expired / Lapsed | 1954-11-26 | 1959-02-17 | 0 | Details |
| US2873074A | Flight control system | Expired / Lapsed | 1953-10-09 | 1959-02-10 | 0 | Details |
| US2869684A | Tape feeding system | Expired / Lapsed | 1954-08-05 | 1959-01-20 | 0 | Details |
| US2869322A | Fuel control system for gas turbine engines under steady-st… | Expired / Lapsed | 1954-02-18 | 1959-01-20 | 0 | Details |
| US2869063A | Control systems for dirigible craft | Expired / Lapsed | 1954-06-10 | 1959-01-13 | 0 | Details |
| US2867766A | Engine analyzer system | Expired / Lapsed | 1955-05-25 | 1959-01-06 | 0 | Details |
| US2867781A | Microwave spectrometer absorption cells | Expired / Lapsed | 1954-11-26 | 1959-01-06 | 0 | Details |
| US2866016A | Signal comparator | Expired / Lapsed | 1955-09-16 | 1958-12-23 | 0 | Details |
| US2864965A | Electron gun for tubular beam | Expired / Lapsed | 1956-04-05 | 1958-12-16 | 0 | Details |
| US2864892A | Transducer mounting | Expired / Lapsed | 1954-04-07 | 1958-12-16 | 0 | Details |
| US2863138A | Two-way shift register | Expired / Lapsed | 1957-03-05 | 1958-12-02 | 0 | Details |
| US2862664A | Electrical keyboard | Expired / Lapsed | 1955-10-31 | 1958-12-02 | 0 | Details |
| US2862199A | Magnetic drum storage system | Expired / Lapsed | 1955-05-24 | 1958-11-25 | 0 | Details |
| US2862167A | Autopilot servomotor systems | Expired / Lapsed | 1953-12-08 | 1958-11-25 | 0 | Details |
| US2860756A | Information translating apparatus | Expired / Lapsed | 1952-03-31 | 1958-11-18 | 0 | Details |
| US2858526A | Magnetic shift register systems | Expired / Lapsed | 1955-09-30 | 1958-10-28 | 0 | Details |
| US2857100A | Error detection system | Expired / Lapsed | 1957-03-05 | 1958-10-21 | 0 | Details |
| US2857586A | Logical magnetic circuits | Expired / Lapsed | 1954-04-08 | 1958-10-21 | 0 | Details |
| US2856595A | Control apparatus for digital computing machinery | Expired / Lapsed | 1954-06-09 | 1958-10-14 | 0 | Details |
| US2854856A | Programmer | Expired / Lapsed | 1957-08-26 | 1958-10-07 | 0 | Details |
| US2854586A | Magnetic amplifier circuit | Expired / Lapsed | 1954-12-15 | 1958-09-30 | 0 | Details |
| US2853656A | Printed circuit panel assembly | Expired / Lapsed | 1953-08-07 | 1958-09-23 | 0 | Details |
| US2848647A | Multiplexing system | Expired / Lapsed | 1954-06-23 | 1958-08-19 | 0 | Details |
| US2848605A | Analogue-to-digital conversion using cathode ray sampler to… | Expired / Lapsed | 1954-01-22 | 1958-08-19 | 0 | Details |
| US2846666A | Magnetostrictive pulse delay apparatus | Expired / Lapsed | 1956-04-11 | 1958-08-05 | 0 | Details |
| US2846671A | Magnetic matrix | Expired / Lapsed | 1955-06-29 | 1958-08-05 | 0 | Details |
| US2844812A | Variable matrix for performing arithmetic and logical funct… | Expired / Lapsed | 1952-12-04 | 1958-07-22 | 0 | Details |
| US2843243A | Printing device | Expired / Lapsed | 1955-08-09 | 1958-07-15 | 0 | Details |
| US2843845A | Indicator display | Expired / Lapsed | 1955-07-06 | 1958-07-15 | 0 | Details |
| US2842663A | Comparator | Expired / Lapsed | 1955-06-10 | 1958-07-08 | 0 | Details |
| US2842761A | Moving target indicator radar system | Expired / Lapsed | 1953-01-12 | 1958-07-08 | 0 | Details |
| US2841345A | Glide path system with flare out | Expired / Lapsed | 1952-01-15 | 1958-07-01 | 0 | Details |
| US2840366A | Accelerometers | Expired / Lapsed | 1952-11-25 | 1958-06-24 | 0 | Details |
| US2838686A | Amplifier for pulse type signals | Expired / Lapsed | 1955-07-28 | 1958-06-10 | 0 | Details |
| FR1157320A | Transistor control circuits | Expired / Lapsed | 1956-07-05 | 1958-05-28 | 0 | Details |
| US2835888A | Multiple pulsed navigation system | Expired / Lapsed | 1956-09-27 | 1958-05-20 | 0 | Details |
| US2835882A | Magnetizable record reading system | Expired / Lapsed | 1955-01-27 | 1958-05-20 | 0 | Details |
| US2835131A | Navigating systems for dirigible craft | Expired / Lapsed | 1952-12-23 | 1958-05-20 | 0 | Details |
| US2835132A | Gyro verticals | Expired / Lapsed | 1952-06-04 | 1958-05-20 | 0 | Details |
| US2834095A | Method of making drum type sequence switches | Expired / Lapsed | 1956-10-16 | 1958-05-13 | 0 | Details |
| US2834894A | Asymmetrically energized magnetic amplifiers | Expired / Lapsed | 1956-06-05 | 1958-05-13 | 0 | Details |
| US2834883A | Peak amplitude indicator | Expired / Lapsed | 1955-10-12 | 1958-05-13 | 0 | Details |
| US2834893A | Magnetic amplifier flip-flop circuit | Expired / Lapsed | 1955-01-10 | 1958-05-13 | 0 | Details |
| US2834007A | Shifting register or array | Expired / Lapsed | 1954-10-07 | 1958-05-06 | 0 | Details |
| US2832887A | Compensated charge storage circuit | Expired / Lapsed | 1955-11-04 | 1958-04-29 | 0 | Details |
| US2831424A | Traveling type carriage in high speed printers | Expired / Lapsed | 1954-03-01 | 1958-04-22 | 0 | Details |
| US2832062A | Magnetic device | Expired / Lapsed | 1952-11-13 | 1958-04-22 | 0 | Details |
| US2831180A | Traveling magnetic half-heads for magnetic drums | Expired / Lapsed | 1955-06-01 | 1958-04-15 | 0 | Details |
| US2830291A | Flare-out control | Expired / Lapsed | 1954-09-23 | 1958-04-08 | 0 | Details |
| US2828482A | Conversion systems | Expired / Lapsed | 1956-05-15 | 1958-03-25 | 0 | Details |
| US2827573A | Quarter adder | Expired / Lapsed | 1954-12-10 | 1958-03-18 | 0 | Details |
| US2824776A | Magnetic recording | Expired / Lapsed | 1956-08-10 | 1958-02-25 | 0 | Details |
| US2824961A | Decade counter for producing an output at the count of nine | Expired / Lapsed | 1955-03-04 | 1958-02-25 | 0 | Details |
| US2823877A | Control systems for dirigible craft | Expired / Lapsed | 1954-06-10 | 1958-02-18 | 0 | Details |
| US2823464A | Flight indicating system | Expired / Lapsed | 1954-01-08 | 1958-02-18 | 0 | Details |
| US2822694A | System for constraining mass of gyro wheel | Expired / Lapsed | 1957-03-20 | 1958-02-11 | 0 | Details |
| US2823373A | Toroidal core assembly | Expired / Lapsed | 1956-10-16 | 1958-02-11 | 0 | Details |
| US2823321A | Gate and buffer circuits | Expired / Lapsed | 1955-05-03 | 1958-02-11 | 0 | Details |
| US2822752A | Differential type setting and resetting means | Expired / Lapsed | 1955-03-04 | 1958-02-11 | 0 | Details |
| US2823372A | Magnetic core mounting assembly | Expired / Lapsed | 1954-12-31 | 1958-02-11 | 0 | Details |
| US2823371A | Magnetic core mounting assembly | Expired / Lapsed | 1954-11-30 | 1958-02-11 | 0 | Details |
| US2823378A | Aircraft navigation instrument | Expired / Lapsed | 1954-04-07 | 1958-02-11 | 0 | Details |
| US2822532A | Magnetic memory storage circuits and apparatus | Expired / Lapsed | 1954-04-29 | 1958-02-04 | 0 | Details |
| US2821083A | Sonic air stream direction detector system | Expired / Lapsed | 1955-01-19 | 1958-01-28 | 0 | Details |
| US2819395A | Driving circuits for static magnetic elements | Expired / Lapsed | 1954-05-24 | 1958-01-07 | 0 | Details |
| US2819453A | Microwave frequency meter | Expired / Lapsed | 1954-03-10 | 1958-01-07 | 0 | Details |
| US2817479A | Method and device for predicting values of a fluctuating sy… | Expired / Lapsed | 1955-02-28 | 1957-12-24 | 0 | Details |
| US2815169A | Secant solver | Expired / Lapsed | 1952-04-23 | 1957-12-03 | 0 | Details |
| US2814793A | Variable delay line | Expired / Lapsed | 1955-04-05 | 1957-11-26 | 0 | Details |
| US2812902A | Accounting apparatus | Expired / Lapsed | 1955-06-01 | 1957-11-12 | 0 | Details |
| US2813236A | Control system for electric servomotors | Expired / Lapsed | 1949-01-14 | 1957-11-12 | 0 | Details |
| US2812450A | Pulse timing systems | Expired / Lapsed | 1955-04-29 | 1957-11-05 | 0 | Details |
| US2812509A | Private line system | Expired / Lapsed | 1953-08-31 | 1957-11-05 | 0 | Details |
| US2811785A | Gyroscopic direction-indicating instruments | Expired / Lapsed | 1946-04-02 | 1957-11-05 | 0 | Details |
| US2811102A | Random printing means | Expired / Lapsed | 1954-03-18 | 1957-10-29 | 0 | Details |
| US2811101A | Magneto-strictive type printing device | Expired / Lapsed | 1954-03-18 | 1957-10-29 | 0 | Details |
| US2810905A | High frequency directive beam apparatus | Expired / Lapsed | 1949-08-23 | 1957-10-22 | 0 | Details |
| US2809340A | Aircraft clearance control system | Expired / Lapsed | 1955-12-12 | 1957-10-08 | 0 | Details |
| US2809344A | Ignition repression control system | Expired / Lapsed | 1953-11-12 | 1957-10-08 | 0 | Details |
| US2809000A | Safety system for navigable craft | Expired / Lapsed | 1951-12-29 | 1957-10-08 | 0 | Details |
| US2808999A | Automatic flight control apparatus | Expired / Lapsed | 1949-05-07 | 1957-10-08 | 0 | Details |
| US2807003A | Timing signal generation | Expired / Lapsed | 1955-04-14 | 1957-09-17 | 0 | Details |
| US2806158A | Magnetic torque transmitting devices | Expired / Lapsed | 1954-12-27 | 1957-09-10 | 0 | Details |
| US2805409A | Magnetic core devices | Expired / Lapsed | 1955-09-14 | 1957-09-03 | 0 | Details |
| US2805020A | Binary arithmetic computer circuit | Expired / Lapsed | 1955-09-06 | 1957-09-03 | 0 | Details |
| US2802049A | Magnetic printer | Expired / Lapsed | 1955-08-09 | 1957-08-06 | 0 | Details |
| US2802202A | Gating circuit | Expired / Lapsed | 1955-07-13 | 1957-08-06 | 0 | Details |
| US2801059A | Radio controlled craft guidance system | Expired / Lapsed | 1954-08-02 | 1957-07-30 | 0 | Details |
| US2798156A | Digit pulse counter | Expired / Lapsed | 1953-12-17 | 1957-07-02 | 0 | Details |
| US2797912A | Acceleration-responsive device | Expired / Lapsed | 1953-10-21 | 1957-07-02 | 0 | Details |
| US2795736A | Automatic headlight dimmer | Expired / Lapsed | 1953-11-04 | 1957-06-11 | 0 | Details |
| US2795757A | Toroidal ferromagnetic core testing | Expired / Lapsed | 1953-05-15 | 1957-06-11 | 0 | Details |
| US2794979A | Means for detecting improper sky wave synchronization | Expired / Lapsed | 1952-05-24 | 1957-06-04 | 0 | Details |
| US2794147A | Beam tube switching circuits | Expired / Lapsed | 1955-08-22 | 1957-05-28 | 0 | Details |
| US2790528A | Sheet feeding control apparatus | Expired / Lapsed | 1954-01-21 | 1957-04-30 | 0 | Details |
| US2788879A | Information recording apparatus | Expired / Lapsed | 1955-10-04 | 1957-04-16 | 0 | Details |
| US2787760A | Automotive engine analyzer | Expired / Lapsed | 1952-12-19 | 1957-04-02 | 0 | Details |
| US2787750A | Speed control system for electric motor | Expired / Lapsed | 1951-05-04 | 1957-04-02 | 0 | Details |
| US2786137A | Pulse standardizer circuit | Expired / Lapsed | 1952-10-21 | 1957-03-19 | 0 | Details |
| US2781446A | Pulse cycling circuit | Expired / Lapsed | 1952-03-28 | 1957-02-12 | 0 | Details |
| US2780408A | Electronic accumulator | Expired / Lapsed | 1951-06-22 | 1957-02-05 | 0 | Details |
| US2778933A | Amplitude modulation detector which is phase responsive | Expired / Lapsed | 1951-08-25 | 1957-01-22 | 0 | Details |
| US2777951A | Erequency modulating systems for phase-shift oscillators | Expired / Lapsed | 1952-12-10 | 1957-01-15 | 0 | Details |
| US2776099A | Air traffic control system | Expired / Lapsed | 1953-01-05 | 1957-01-01 | 0 | Details |
| US2772359A | Synchronized oscillator | Expired / Lapsed | 1955-05-26 | 1956-11-27 | 0 | Details |
| US2771595A | Data storage system | Expired / Lapsed | 1950-12-30 | 1956-11-20 | 0 | Details |
| US2770452A | System for measuring the acceleration of a dirigible craft | Expired / Lapsed | 1954-11-26 | 1956-11-13 | 0 | Details |
| US2762935A | Magnetic device | Expired / Lapsed | 1953-11-17 | 1956-09-11 | 0 | Details |
| US2762123A | Navigation system | Expired / Lapsed | 1948-05-26 | 1956-09-11 | 0 | Details |
| US2757604A | Decoding and character forming means for high speed recorder | Expired / Lapsed | 1953-08-26 | 1956-08-07 | 0 | Details |
| US2757341A | Ultrahigh frequency energy switch | Expired / Lapsed | 1952-03-13 | 1956-07-31 | 0 | Details |
| US2755381A | Delay line trigger circuit | Expired / Lapsed | 1952-04-18 | 1956-07-17 | 0 | Details |
| US2755383A | Frequency control circuits | Expired / Lapsed | 1951-06-29 | 1956-07-17 | 0 | Details |
| US2753545A | Two element per bit shift registers requiring a single adva… | Expired / Lapsed | 1954-10-08 | 1956-07-03 | 0 | Details |
| US2752091A | Ground position indicator system | Expired / Lapsed | 1953-10-12 | 1956-06-26 | 0 | Details |
| US2752593A | Initiating and timing circuit for a doppler type chronograph | Expired / Lapsed | 1951-10-11 | 1956-06-26 | 0 | Details |
| US2749451A | Flip-flop circuit | Expired / Lapsed | 1955-03-07 | 1956-06-05 | 0 | Details |
| US2749533A | Sequence discriminator system for locating information | Expired / Lapsed | 1950-05-23 | 1956-06-05 | 0 | Details |
| US2748296A | Variable delay line network | Expired / Lapsed | 1955-03-04 | 1956-05-29 | 0 | Details |
| US2748270A | Gating system | Expired / Lapsed | 1952-03-31 | 1956-05-29 | 0 | Details |
| US2743422A | Coaxial stub supports | Expired / Lapsed | 1952-02-20 | 1956-04-24 | 0 | Details |
| US2743320A | Variable area magnetic recording system | Expired / Lapsed | 1949-12-13 | 1956-04-24 | 0 | Details |
| US2741758A | Magnetic core logical circuits | Expired / Lapsed | 1954-10-28 | 1956-04-10 | 0 | Details |
| US2738484A | Solderless terminal | Expired / Lapsed | 1954-06-17 | 1956-03-13 | 0 | Details |
| US2737882A | High speed printing and perforating machine | Expired / Lapsed | 1952-05-16 | 1956-03-13 | 0 | Details |
| US2737633A | Wave guide rotary joint system | Expired / Lapsed | 1951-01-25 | 1956-03-06 | 0 | Details |
| US2737652A | Fixed gun inter-aircraft fire control system | Expired / Lapsed | 1943-02-18 | 1956-03-06 | 0 | Details |
| US2731203A | Saturable core circuits for counting and the like | Expired / Lapsed | 1951-05-24 | 1956-01-17 | 0 | Details |
| US2730698A | Position indicating apparatus | Expired / Lapsed | 1951-03-26 | 1956-01-10 | 0 | Details |
| US2729812A | Apparatus for converting digital information to an analog v… | Expired / Lapsed | 1954-10-04 | 1956-01-03 | 0 | Details |
| US2729808A | Pulse gating circuits and methods | Expired / Lapsed | 1952-12-04 | 1956-01-03 | 0 | Details |
| US2729807A | Gate and memory circuits utilizing magnetic cores | Expired / Lapsed | 1952-11-20 | 1956-01-03 | 0 | Details |
| US2729108A | Control systems for gyroscopic instruments | Expired / Lapsed | 1951-12-13 | 1956-01-03 | 0 | Details |
| US2729745A | Sweep arrangements for servo systems | Expired / Lapsed | 1951-06-05 | 1956-01-03 | 0 | Details |
| US2721952A | Grid structure and the process of making | Expired / Lapsed | 1952-05-14 | 1955-10-25 | 0 | Details |
| US2720164A | Dot printing interpreter | Expired / Lapsed | 1952-01-26 | 1955-10-11 | 0 | Details |
| US2720626A | Integrator | Expired / Lapsed | 1950-06-06 | 1955-10-11 | 0 | Details |
| US2719226A | Timed signal generator | Expired / Lapsed | 1951-06-04 | 1955-09-27 | 0 | Details |
| US2717999A | Automatic range gate | Expired / Lapsed | 1949-01-07 | 1955-09-13 | 0 | Details |
| US2715776A | Stabilized gun control system with aided tracking | Expired / Lapsed | 1942-05-25 | 1955-08-23 | 0 | Details |
| US2713674A | Flip-flop circuit using a single core | Expired / Lapsed | 1954-06-04 | 1955-07-19 | 0 | Details |
| US2712269A | Automatic dive bombsight | Expired / Lapsed | 1945-12-29 | 1955-07-05 | 0 | Details |
| US2710952A | Ring counter utilizing magnetic amplifiers | Expired / Lapsed | 1954-05-12 | 1955-06-14 | 0 | Details |
| US2708693A | Methods and apparatus for setting magnetic transducing heads | Expired / Lapsed | 1952-02-25 | 1955-05-17 | 0 | Details |
| US2708751A | Error indicating system | Expired / Lapsed | 1948-03-31 | 1955-05-17 | 0 | Details |
| US2708020A | Printing device for statistical card punching machines | Expired / Lapsed | 1950-03-04 | 1955-05-10 | 0 | Details |
| US2706597A | Carry impulse generator | Expired / Lapsed | 1949-03-25 | 1955-04-19 | 0 | Details |
| US2705320A | Radio distance measuring system | Expired / Lapsed | 1952-03-14 | 1955-03-29 | 0 | Details |
| US2704489A | Servo system for aircraft turrets | Expired / Lapsed | 1943-04-17 | 1955-03-22 | 0 | Details |
| US2703380A | Phase comparison apparatus for data transmission systems | Expired / Lapsed | 1949-09-21 | 1955-03-01 | 0 | Details |
| US2700503A | Electronic binary multiplying computer | Expired / Lapsed | 1950-04-06 | 1955-01-25 | 0 | Details |
| US2699612A | Azimuth data providing system for dirigible craft | Expired / Lapsed | 1950-01-31 | 1955-01-18 | 0 | Details |
| US2698930A | Magnetic displacement recorder | Expired / Lapsed | 1949-03-31 | 1955-01-04 | 0 | Details |
| US2696947A | Gun directing system | Expired / Lapsed | 1943-08-28 | 1954-12-14 | 0 | Details |
| US2695199A | Bearing | Expired / Lapsed | 1947-10-27 | 1954-11-23 | 0 | Details |
| US2694362A | High-speed dot printer | Expired / Lapsed | 1951-08-25 | 1954-11-16 | 0 | Details |
| US2693593A | Decoding circuit | Expired / Lapsed | 1950-08-19 | 1954-11-02 | 0 | Details |
| US2692985A | Radar indicator apparatus | Expired / Lapsed | 1946-06-12 | 1954-10-26 | 0 | Details |
| US2689953A | Positionally selective communication system | Expired / Lapsed | 1949-05-18 | 1954-09-21 | 0 | Details |
| US2688525A | Utility counter-desk | Expired / Lapsed | 1952-06-05 | 1954-09-07 | 0 | Details |
| US2687490A | High-frequency beam tube device | Expired / Lapsed | 1949-09-22 | 1954-08-24 | 0 | Details |
| US2686299A | Selecting network | Expired / Lapsed | 1950-06-24 | 1954-08-10 | 0 | Details |
| US2686100A | Pulse recording apparatus | Expired / Lapsed | 1949-04-12 | 1954-08-10 | 0 | Details |
| US2685653A | Gate circuit | Expired / Lapsed | 1952-01-31 | 1954-08-03 | 0 | Details |
| US2683596A | Rate of turn instrument | Expired / Lapsed | 1950-07-11 | 1954-07-13 | 0 | Details |
| US2683410A | Selective wire printing machine | Expired / Lapsed | 1949-03-08 | 1954-07-13 | 0 | Details |
| US2681614A | Recording machine with grouped recording elements operable … | Expired / Lapsed | 1949-09-27 | 1954-06-22 | 0 | Details |
| US2679033A | Pictorial indicator | Expired / Lapsed | 1953-01-05 | 1954-05-18 | 0 | Details |
| US2678177A | Manual booster and automatic pilot servo system | Expired / Lapsed | 1951-12-13 | 1954-05-11 | 0 | Details |
| US2677815A | Photoelectric checking circuits | Expired / Lapsed | 1951-12-04 | 1954-05-04 | 0 | Details |
| US2677766A | Scalloped limacon pattern antenna | Expired / Lapsed | 1949-05-18 | 1954-05-04 | 0 | Details |
| US2676249A | Discharge tube isolation circuit | Expired / Lapsed | 1949-08-26 | 1954-04-20 | 0 | Details |
| US2673337A | Amplifier system utilizing saturable magnetic elements | Expired / Lapsed | 1952-12-04 | 1954-03-23 | 0 | Details |
| US2673233A | Coaxial line coupling | Expired / Lapsed | 1947-01-08 | 1954-03-23 | 0 | Details |
| US2672334A | Accelerometer | Expired / Lapsed | 1948-12-15 | 1954-03-16 | 0 | Details |
| US2671198A | Method and apparatus for measuring the frequency response o… | Expired / Lapsed | 1951-04-12 | 1954-03-02 | 0 | Details |
| US2671169A | Switching circuit | Expired / Lapsed | 1950-07-19 | 1954-03-02 | 0 | Details |
| US2670461A | Electromagnetic wave attenuator | Expired / Lapsed | 1949-09-29 | 1954-02-23 | 0 | Details |
| US2668191A | Wave energy polarization converter | Expired / Lapsed | 1949-06-30 | 1954-02-02 | 0 | Details |
| US2666199A | Radio direction maintaining system | Expired / Lapsed | 1950-05-09 | 1954-01-12 | 0 | Details |
| US2666177A | Servomotor system having differential torque displacement f… | Expired / Lapsed | 1949-04-01 | 1954-01-12 | 0 | Details |
| US2664254A | Air-speed control system | Expired / Lapsed | 1950-01-21 | 1953-12-29 | 0 | Details |
| US2664560A | Radio aid to navigation | Expired / Lapsed | 1949-12-01 | 1953-12-29 | 0 | Details |
| US2662301A | Gyroscopic compass correction system | Expired / Lapsed | 1951-11-21 | 1953-12-15 | 0 | Details |
| US2660793A | Stabilized tracking and fire control system | Expired / Lapsed | 1942-05-22 | 1953-12-01 | 0 | Details |
| US2658972A | Mechanical bi-stable device | Expired / Lapsed | 1951-05-23 | 1953-11-10 | 0 | Details |
| US2657464A | Fire control apparatus | Expired / Lapsed | 1928-07-26 | 1953-11-03 | 0 | Details |
| US2657329A | Traveling wave tube | Expired / Lapsed | 1950-02-21 | 1953-10-27 | 0 | Details |
| US2653299A | High-frequency power measuring apparatus | Expired / Lapsed | 1950-06-27 | 1953-09-22 | 0 | Details |
| US2652196A | Wire recording storage mechanism for bookkeeping machines | Expired / Lapsed | 1949-05-20 | 1953-09-15 | 0 | Details |
| US2651771A | Angular motion detector and position indicator | Expired / Lapsed | 1949-10-14 | 1953-09-08 | 0 | Details |
| US2651033A | Automatic amplitude balancing circuits | Expired / Lapsed | 1952-01-21 | 1953-09-01 | 0 | Details |
| US2650148A | Apronless table and leg fastening therefor | Expired / Lapsed | 1952-06-28 | 1953-08-25 | 0 | Details |
| US2649264A | Flight control system | Expired / Lapsed | 1947-03-15 | 1953-08-18 | 0 | Details |
| US2648277A | Card controlled wire printing and feeding means | Expired / Lapsed | 1948-12-23 | 1953-08-11 | 0 | Details |
| US2646946A | Autopilot | Expired / Lapsed | 1950-10-10 | 1953-07-28 | 0 | Details |
| US2647258A | Automatic tracking system | Expired / Lapsed | 1946-03-29 | 1953-07-28 | 0 | Details |
| US2644427A | Servo system | Expired / Lapsed | 1949-07-15 | 1953-07-07 | 0 | Details |
| US2643068A | Potentiometer winder | Expired / Lapsed | 1944-06-09 | 1953-06-23 | 0 | Details |
| US2640647A | Magnetizable record element | Expired / Lapsed | 1950-01-13 | 1953-06-02 | 0 | Details |
| US2638199A | Power operated typewriter | Expired / Lapsed | 1949-06-25 | 1953-05-12 | 0 | Details |
| US2637024A | Craft position plotting system | Expired / Lapsed | 1947-10-29 | 1953-04-28 | 0 | Details |
| US2633491A | Universal decoding mechanism | Expired / Lapsed | 1950-09-21 | 1953-03-31 | 0 | Details |
| US2632886A | Null balance indicator | Expired / Lapsed | 1952-01-02 | 1953-03-24 | 0 | Details |
| US2632386A | Wire type printing machine | Expired / Lapsed | 1949-04-20 | 1953-03-24 | 0 | Details |
| US2631455A | Stable reference apparatus | Expired / Lapsed | 1946-06-29 | 1953-03-17 | 0 | Details |
| US2629289A | Fire control apparatus for controlling the flight of missil… | Expired / Lapsed | 1945-05-03 | 1953-02-24 | 0 | Details |
| US2627384A | Flight control apparatus | Expired / Lapsed | 1947-08-07 | 1953-02-03 | 0 | Details |
| US2627598A | Phase shift system | Expired / Lapsed | 1947-02-20 | 1953-02-03 | 0 | Details |
| US2626767A | Automatic speed control system | Expired / Lapsed | 1947-01-24 | 1953-01-27 | 0 | Details |
| US2625650A | Superregenerative apparatus | Expired / Lapsed | 1948-10-16 | 1953-01-13 | 0 | Details |
| US2624505A | Computer | Expired / Lapsed | 1950-05-02 | 1953-01-06 | 0 | Details |
| US2623714A | Automatic flight control system | Expired / Lapsed | 1948-12-01 | 1952-12-30 | 0 | Details |
| US2622441A | Internal-combustion engine power analyzer | Expired / Lapsed | 1947-03-15 | 1952-12-23 | 0 | Details |
| US2621238A | Phase shift timer | Expired / Lapsed | 1947-03-04 | 1952-12-09 | 0 | Details |
| US2620669A | Compensated gyro-vertical | Expired / Lapsed | 1946-11-23 | 1952-12-09 | 0 | Details |
| CA488605A | Timing apparatus | Expired / Lapsed | — | 1952-12-02 | 0 | Details |
| US2619540A | Ultrahigh-frequency power measuring apparatus | Expired / Lapsed | 1947-01-24 | 1952-11-25 | 0 | Details |
| US2617982A | Radio gun control system | Expired / Lapsed | 1942-04-30 | 1952-11-11 | 0 | Details |
| US2613352A | Radio navigation system | Expired / Lapsed | 1949-11-18 | 1952-10-07 | 0 | Details |
| US2613317A | Circuits for object locator apparatus | Expired / Lapsed | 1949-08-27 | 1952-10-07 | 0 | Details |
| US2613351A | Radio navigation device | Expired / Lapsed | 1948-05-18 | 1952-10-07 | 0 | Details |
| US2613350A | Flight indicating system for dirigible craft | Expired / Lapsed | 1948-03-16 | 1952-10-07 | 0 | Details |
| US2612621A | Control circuits for cathode-ray tubes | Expired / Lapsed | 1942-06-18 | 1952-09-30 | 0 | Details |
| US2611081A | Automatic gain control system | Expired / Lapsed | 1948-11-22 | 1952-09-16 | 0 | Details |
| US2611127A | Continuous wave navigation system | Expired / Lapsed | 1947-10-28 | 1952-09-16 | 0 | Details |
| US2608529A | Method of uniting parts by electrodeposition | Expired / Lapsed | 1945-12-29 | 1952-08-26 | 2 | Details |
| US2602611A | Automatic pilot for aircraft | Expired / Lapsed | 1948-01-12 | 1952-07-08 | 0 | Details |
| US2602895A | Ultrahigh-frequency antenna apparatus | Expired / Lapsed | 1946-04-25 | 1952-07-08 | 0 | Details |
| US2598672A | Marine gyro vertical | Expired / Lapsed | 1945-08-01 | 1952-06-03 | 0 | Details |
| US2597867A | High-frequency attenuating device | Expired / Lapsed | 1949-08-17 | 1952-05-27 | 0 | Details |
| US2597892A | Altitude controlling autopilot for aircraft | Expired / Lapsed | 1947-01-09 | 1952-05-27 | 0 | Details |
| US2595228A | Control circuit for cathode-ray oscilloscopes | Expired / Lapsed | 1948-10-27 | 1952-05-06 | 0 | Details |
| US2595268A | Instrument providing a vertical reference for dirigible cra… | Expired / Lapsed | 1946-10-26 | 1952-05-06 | 0 | Details |
| US2595309A | Flight control apparatus for aircraft | Expired / Lapsed | 1946-06-26 | 1952-05-06 | 0 | Details |
| US2595250A | Automatic recovery pilot for aircraft | Expired / Lapsed | 1945-05-15 | 1952-05-06 | 0 | Details |
| US2593501A | Stroboscope | Expired / Lapsed | 1947-06-04 | 1952-04-22 | 0 | Details |
| US2591697A | Stable reference apparatus | Expired / Lapsed | 1946-08-26 | 1952-04-08 | 0 | Details |
| US2590091A | Magnetic process control | Expired / Lapsed | 1946-04-03 | 1952-03-25 | 0 | Details |
| US2588190A | Analyzer and transfer unit in tabulating and like machines | Expired / Lapsed | 1946-06-13 | 1952-03-04 | 0 | Details |
| US2585685A | Tabulating and total sensing control mechanism | Expired / Lapsed | 1949-05-11 | 1952-02-12 | 0 | Details |
| US2585630A | Digit shifting circuit | Expired / Lapsed | 1949-05-03 | 1952-02-12 | 0 | Details |
| US2584127A | Servo system | Expired / Lapsed | 1946-12-05 | 1952-02-05 | 0 | Details |
| US2583573A | Radio receiving system | Expired / Lapsed | 1945-11-21 | 1952-01-29 | 0 | Details |
| US2581438A | Navigation computer and piloting system | Expired / Lapsed | 1946-03-30 | 1952-01-08 | 0 | Details |
| US2580678A | High-frequency measuring apparatus | Expired / Lapsed | 1943-09-17 | 1952-01-01 | 0 | Details |
| US2577785A | Computing gun sight | Expired / Lapsed | 1944-07-28 | 1951-12-11 | 0 | Details |
| US2576943A | Wave guide modulation apparatus | Expired / Lapsed | 1945-01-31 | 1951-12-04 | 0 | Details |
| US2576552A | Electronic switching circuit | Expired / Lapsed | 1950-08-11 | 1951-11-27 | 0 | Details |
| US2574494A | Timing apparatus | Expired / Lapsed | 1946-07-16 | 1951-11-13 | 0 | Details |
| US2574471A | Gyromagnetic compass | Expired / Lapsed | 1945-08-23 | 1951-11-13 | 0 | Details |
| US2572041A | Selective azimuth signaling system | Expired / Lapsed | 1947-10-29 | 1951-10-23 | 0 | Details |
| US2571129A | Scanning antenna system | Expired / Lapsed | 1947-12-03 | 1951-10-16 | 0 | Details |
| US2570249A | Combining and separating circuits | Expired / Lapsed | 1947-03-29 | 1951-10-09 | 0 | Details |
| US2568719A | Control system for aircraft control surface and tab | Expired / Lapsed | 1947-04-09 | 1951-09-25 | 0 | Details |
| US2567552A | Data card sensing device | Expired / Lapsed | 1950-12-23 | 1951-09-11 | 0 | Details |
| US2565506A | Omnidirectional radio range system | Expired / Lapsed | 1949-07-26 | 1951-08-28 | 0 | Details |
| US2563102A | Digit indicator | Expired / Lapsed | 1948-06-19 | 1951-08-07 | 0 | Details |
| US2562943A | Frequency control apparatus | Expired / Lapsed | 1943-12-30 | 1951-08-07 | 0 | Details |
| US2558758A | Radio velocity indicator | Expired / Lapsed | 1944-01-22 | 1951-07-03 | 0 | Details |
| US2555328A | Great circle direction-keeping instrument | Expired / Lapsed | 1944-01-06 | 1951-06-05 | 0 | Details |
| US2554512A | Accelerometer | Expired / Lapsed | 1946-05-28 | 1951-05-29 | 0 | Details |
| US2553560A | Aircraft turn control | Expired / Lapsed | 1946-07-10 | 1951-05-22 | 0 | Details |
| US2553597A | Aircraft automatic pilot | Expired / Lapsed | 1946-02-23 | 1951-05-22 | 0 | Details |
| US2553546A | Airplane automatic pilot | Expired / Lapsed | 1945-01-31 | 1951-05-22 | 0 | Details |
| US2552527A | Automatic gain-control system for radar direction indicators | Expired / Lapsed | 1945-03-28 | 1951-05-15 | 0 | Details |
| US2550316A | Image storage device | Expired / Lapsed | 1949-01-29 | 1951-04-24 | 0 | Details |
| US2548900A | Data presentation apparatus | Expired / Lapsed | 1946-06-12 | 1951-04-17 | 0 | Details |
| US2546784A | Punch tape sensing condenser | Expired / Lapsed | 1948-02-12 | 1951-03-27 | 0 | Details |
| US2546271A | Motor control system | Expired / Lapsed | 1946-12-21 | 1951-03-27 | 0 | Details |
| US2546156A | Computer apparatus | Expired / Lapsed | 1944-11-30 | 1951-03-27 | 0 | Details |
| US2544646A | Angular velocity measuring instrument | Expired / Lapsed | 1948-06-16 | 1951-03-13 | 0 | Details |
| US2544648A | Antenna apparatus | Expired / Lapsed | 1946-03-22 | 1951-03-13 | 0 | Details |
| US2543753A | Color altimetry | Expired / Lapsed | 1943-06-30 | 1951-03-06 | 0 | Details |
| US2543072A | Automatic range gate | Expired / Lapsed | 1944-06-09 | 1951-02-27 | 0 | Details |
| US2542018A | Compass | Expired / Lapsed | 1944-09-28 | 1951-02-20 | 0 | Details |
| US2541066A | Object detecting and warning system and method | Expired / Lapsed | 1943-11-24 | 1951-02-13 | 0 | Details |
| US2540121A | Stereoscopic object locating system | Expired / Lapsed | 1943-06-17 | 1951-02-06 | 0 | Details |
| US2539411A | Automatic pilot | Expired / Lapsed | 1944-02-03 | 1951-01-30 | 0 | Details |
| US2537732A | Carrier for perforated record cards | Expired / Lapsed | 1948-02-18 | 1951-01-09 | 0 | Details |
| US2537083A | Backlash-compensated servo system | Expired / Lapsed | 1945-10-22 | 1951-01-09 | 0 | Details |
| US2537065A | Gate generator | Expired / Lapsed | 1944-04-18 | 1951-01-09 | 0 | Details |
| US2535125A | Perforated record card | Expired / Lapsed | 1945-11-09 | 1950-12-26 | 0 | Details |
| US2534437A | Ultra high frequency transmission line system | Expired / Lapsed | 1949-03-30 | 1950-12-19 | 0 | Details |
| US2534293A | Servomotor and system having improved torque characteristics | Expired / Lapsed | 1946-12-21 | 1950-12-19 | 0 | Details |
| US2534276A | Vibration pickup device and system | Expired / Lapsed | 1944-01-10 | 1950-12-19 | 0 | Details |
| US2532317A | Ultra high frequency coupler | Expired / Lapsed | 1947-08-25 | 1950-12-05 | 0 | Details |
| US2531455A | Directive antenna structure | Expired / Lapsed | 1942-12-07 | 1950-11-28 | 0 | Details |
| US2531454A | Directive antenna structure | Expired / Lapsed | 1942-02-04 | 1950-11-28 | 0 | Details |
| US2530387A | Motor control circuit | Expired / Lapsed | 1944-05-24 | 1950-11-21 | 0 | Details |
| US2530110A | Nonlinear circuit device utilizing germanium | Expired / Lapsed | 1944-06-02 | 1950-11-14 | 2 | Details |
| US2526709A | Fluid operated motor valve | Expired / Lapsed | 1945-11-29 | 1950-10-24 | 0 | Details |
| US2525901A | Automatic power bridge | Expired / Lapsed | 1949-10-05 | 1950-10-17 | 0 | Details |
| US2524758A | Radio direction finding system | Expired / Lapsed | 1946-04-27 | 1950-10-10 | 0 | Details |
| US2524051A | Full-wave, phase-sensitive demodulator | Expired / Lapsed | 1946-11-05 | 1950-10-03 | 0 | Details |
| US2524050A | Apparatus and method of measuring a magnitude exceeding the… | Expired / Lapsed | 1944-03-29 | 1950-10-03 | 0 | Details |
| US2519359A | Automatic volume control | Expired / Lapsed | 1944-09-29 | 1950-08-22 | 0 | Details |
| US2517612A | Stable platform | Expired / Lapsed | 1947-03-29 | 1950-08-08 | 0 | Details |
| US2517556A | Control circuit for deriving rate and integral terms | Expired / Lapsed | 1945-04-16 | 1950-08-08 | 0 | Details |
| US2516930A | Filament forming method | Expired / Lapsed | 1944-04-14 | 1950-08-01 | 0 | Details |
| US2515267A | Grid structure and method of fabrication | Expired / Lapsed | 1947-04-10 | 1950-07-18 | 0 | Details |
| US2514828A | Synthesized stereoscopic vision | Expired / Lapsed | 1942-09-12 | 1950-07-11 | 0 | Details |
| US2513367A | Radiant energy tracking apparatus | Expired / Lapsed | 1948-05-26 | 1950-07-04 | 0 | Details |
| US2513340A | Angular velocity responsive apparatus | Expired / Lapsed | 1945-10-17 | 1950-07-04 | 0 | Details |
| US2512860A | Control means for electric typewriters | Expired / Lapsed | 1949-06-18 | 1950-06-27 | 0 | Details |
| US2512851A | Pulse generator | Expired / Lapsed | 1948-04-03 | 1950-06-27 | 0 | Details |
| US2512879A | Record sensing device of the capacitive type for use with b… | Expired / Lapsed | 1948-01-20 | 1950-06-27 | 0 | Details |
| US2512703A | Radar direction and range indicating apparatus | Expired / Lapsed | 1943-10-14 | 1950-06-27 | 0 | Details |
| US2504604A | Stable vertical mechanism | Expired / Lapsed | 1944-07-01 | 1950-04-18 | 0 | Details |
| US2502456A | Ultra high frequency discriminator and apparatus | Expired / Lapsed | 1943-04-02 | 1950-04-04 | 0 | Details |
| US2500945A | Modulator and frequency changer | Expired / Lapsed | 1943-11-08 | 1950-03-21 | 0 | Details |
| US2499413A | Pulse generator | Expired / Lapsed | 1944-05-17 | 1950-03-07 | 0 | Details |
| US2499349A | Obstacle avoidance system | Expired / Lapsed | 1943-03-31 | 1950-03-07 | 0 | Details |
| US2497883A | Electronic computer | Expired / Lapsed | 1943-01-28 | 1950-02-21 | 0 | Details |
| US2497065A | Stabilized tower supported antenna | Expired / Lapsed | 1947-12-26 | 1950-02-14 | 0 | Details |
| US2497094A | Microwave apparatus | Expired / Lapsed | 1945-02-28 | 1950-02-14 | 0 | Details |
| US2496294A | Speed governing system for dirigible craft | Expired / Lapsed | 1944-12-29 | 1950-02-07 | 0 | Details |
| US2496809A | Radio controlled pilot system | Expired / Lapsed | 1943-10-12 | 1950-02-07 | 0 | Details |
| US2495753A | Ground target elimination | Expired / Lapsed | 1943-04-12 | 1950-01-31 | 0 | Details |
| US2495042A | Two-sided mosaic and method of manufacturing same | Expired / Lapsed | 1947-11-12 | 1950-01-17 | 0 | Details |
| US2493772A | Electronic signal mixing circuit | Expired / Lapsed | 1945-04-17 | 1950-01-10 | 0 | Details |
| US2491542A | Object detector and velocity indicator | Expired / Lapsed | 1943-09-07 | 1949-12-20 | 0 | Details |
| US2487793A | Object controlling electric motor system | Expired / Lapsed | 1946-12-18 | 1949-11-15 | 0 | Details |
| US2485584A | Distance measuring apparatus | Expired / Lapsed | 1943-11-11 | 1949-10-25 | 0 | Details |
| US2485583A | Radio distance measuring system | Expired / Lapsed | 1943-10-29 | 1949-10-25 | 0 | Details |
| US2485665A | Mixing circuit | Expired / Lapsed | 1943-07-16 | 1949-10-25 | 0 | Details |
| US2485608A | Pulse modulator | Expired / Lapsed | 1943-05-24 | 1949-10-25 | 0 | Details |
| US2484819A | Radio navigation system | Expired / Lapsed | 1946-10-29 | 1949-10-18 | 0 | Details |
| US2485020A | Combined cutting and creasing dies for paper slotting machi… | Expired / Lapsed | 1945-11-05 | 1949-10-18 | 0 | Details |
| US2484034A | Interval measuring system | Expired / Lapsed | 1945-04-24 | 1949-10-11 | 0 | Details |
| US2484022A | Pick-off device for electrical control systems | Expired / Lapsed | 1945-03-27 | 1949-10-11 | 0 | Details |
| US2482809A | Radio craft guidance system | Expired / Lapsed | 1948-04-08 | 1949-09-27 | 0 | Details |
| US2482766A | High-frequency modulating system | Expired / Lapsed | 1942-12-30 | 1949-09-27 | 0 | Details |
| US2482242A | Code selector | Expired / Lapsed | 1948-06-09 | 1949-09-20 | 0 | Details |
| US2480842A | Automatic gain-control system | Expired / Lapsed | 1945-03-06 | 1949-09-06 | 0 | Details |
| US2479820A | Color television system | Expired / Lapsed | 1947-05-01 | 1949-08-23 | 0 | Details |
| US2479568A | Doppler radar system | Expired / Lapsed | 1943-08-19 | 1949-08-23 | 0 | Details |
| US2478956A | Tilt detector and control for gyroscopes | Expired / Lapsed | 1943-07-13 | 1949-08-16 | 0 | Details |
| US2478203A | Follow-up motor control circuit | Expired / Lapsed | 1944-04-08 | 1949-08-09 | 0 | Details |
| US2477574A | Gyro vertical | Expired / Lapsed | 1947-07-21 | 1949-08-02 | 0 | Details |
| US2477615A | Pulse delineator | Expired / Lapsed | 1944-01-04 | 1949-08-02 | 0 | Details |
| US2476449A | Paper feed for accounting machines | Expired / Lapsed | 1945-09-13 | 1949-07-19 | 0 | Details |
| US2475593A | Self-synchronous flux valve system | Expired / Lapsed | 1945-08-28 | 1949-07-12 | 0 | Details |
| US2473159A | Counting tube transfer circuit | Expired / Lapsed | 1949-01-29 | 1949-06-14 | 0 | Details |
| US2472824A | Radio scanning apparatus | Expired / Lapsed | 1945-06-16 | 1949-06-14 | 0 | Details |
| US2470773A | Asymmetric scorsby and method of operation | Expired / Lapsed | 1944-05-03 | 1949-05-24 | 0 | Details |
| US2469419A | Energy directing apparatus | Expired / Lapsed | 1943-10-26 | 1949-05-10 | 0 | Details |
| US2467412A | Navigation instrument | Expired / Lapsed | 1944-06-09 | 1949-04-19 | 0 | Details |
| US2466711A | Pulse radar system | Expired / Lapsed | 1944-01-18 | 1949-04-12 | 0 | Details |
| US2466035A | Electric servomotor system | Expired / Lapsed | 1947-02-28 | 1949-04-05 | 0 | Details |
| US2466537A | Cathode-ray tube sweep circuit | Expired / Lapsed | 1947-02-28 | 1949-04-05 | 0 | Details |
| US2464822A | Indicating device | Expired / Lapsed | 1943-08-16 | 1949-03-22 | 0 | Details |
| US2464259A | Pulse circuits | Expired / Lapsed | 1944-05-11 | 1949-03-15 | 0 | Details |
| US2464276A | Radiant energy directivity pattern scanner | Expired / Lapsed | 1943-08-03 | 1949-03-15 | 0 | Details |
| US2462925A | Radiant energy directional apparatus | Expired / Lapsed | 1946-12-07 | 1949-03-01 | 0 | Details |
| US2462857A | Automatic tuning control system | Expired / Lapsed | 1944-09-28 | 1949-03-01 | 0 | Details |
| US2462856A | Transmitter and/or receiver circuits | Expired / Lapsed | 1942-05-19 | 1949-03-01 | 0 | Details |
| US2462081A | Servomotor system | Expired / Lapsed | 1947-08-22 | 1949-02-22 | 0 | Details |
| US2462095A | Rate circuits | Expired / Lapsed | 1942-06-27 | 1949-02-22 | 0 | Details |
| US2456619A | Gyroscopic controlling means | Expired / Lapsed | 1943-01-19 | 1948-12-21 | 0 | Details |
| US2455373A | Time base sweep and intensifier pulse generator | Expired / Lapsed | 1943-03-25 | 1948-12-07 | 0 | Details |
| US2455364A | Selsyn-controlled servo system | Expired / Lapsed | 1942-12-10 | 1948-12-07 | 0 | Details |
| US2454761A | Ultra high frequency device | Expired / Lapsed | 1942-11-20 | 1948-11-30 | 0 | Details |
| US2454265A | Automatic frequency control system | Expired / Lapsed | 1943-11-06 | 1948-11-16 | 0 | Details |
| US2453711A | Cathode-ray tube control circuit | Expired / Lapsed | 1943-10-04 | 1948-11-16 | 0 | Details |
| US2452587A | Network measuring apparatus | Expired / Lapsed | 1945-02-24 | 1948-11-02 | 0 | Details |
| US2452566A | Ultra high frequency circuit and method | Expired / Lapsed | 1944-12-23 | 1948-11-02 | 0 | Details |
| US2452586A | Phase shift circuits | Expired / Lapsed | 1944-03-23 | 1948-11-02 | 0 | Details |
| US2452575A | Automatic frequency control | Expired / Lapsed | 1943-04-22 | 1948-11-02 | 0 | Details |
| US2452609A | Antihunt follow-up system | Expired / Lapsed | 1942-10-02 | 1948-11-02 | 0 | Details |
| US2450875A | Gyroscopic instrument | Expired / Lapsed | 1943-10-08 | 1948-10-12 | 0 | Details |
| US2450873A | Tube socket | Expired / Lapsed | 1943-09-27 | 1948-10-12 | 0 | Details |
| US2449983A | Coaxial line coupling | Expired / Lapsed | 1943-02-04 | 1948-09-28 | 0 | Details |
| US2449542A | Radio object locating device for producing stereoscopic ima… | Expired / Lapsed | 1943-08-14 | 1948-09-21 | 0 | Details |
| US2448509A | Electrical connector | Expired / Lapsed | 1943-05-14 | 1948-09-07 | 0 | Details |
| US2448564A | Motor control circuits | Expired / Lapsed | 1942-07-24 | 1948-09-07 | 0 | Details |
| US2448023A | Flight indicator | Expired / Lapsed | 1945-07-28 | 1948-08-31 | 0 | Details |
| US2447507A | Balancing circuit | Expired / Lapsed | 1946-01-16 | 1948-08-24 | 0 | Details |
| US2447496A | Flux valve system and method of operation | Expired / Lapsed | 1944-02-03 | 1948-08-24 | 0 | Details |
| US2446546A | Pressure responsive controller device | Expired / Lapsed | 1947-06-10 | 1948-08-10 | 0 | Details |
| US2446567A | Alternating current rate circuits | Expired / Lapsed | 1941-12-30 | 1948-08-10 | 0 | Details |
| US2446180A | Gyroscope controlling means | Expired / Lapsed | 1944-04-05 | 1948-08-03 | 0 | Details |
| US2445773A | Rate taking circuit | Expired / Lapsed | 1944-01-22 | 1948-07-27 | 0 | Details |
| US2445811A | High-frequency tube structure | Expired / Lapsed | 1941-12-22 | 1948-07-27 | 0 | Details |
| US2444445A | Radio navigation system | Expired / Lapsed | 1943-11-10 | 1948-07-06 | 0 | Details |
| US2442770A | Pulse generator | Expired / Lapsed | 1943-04-20 | 1948-06-08 | 0 | Details |
| US2442769A | Electronic delay circuits | Expired / Lapsed | 1942-12-30 | 1948-06-08 | 0 | Details |
| US2441574A | Electromagnetic wave guide | Expired / Lapsed | 1944-02-29 | 1948-05-18 | 0 | Details |
| US2441579A | Stabilized multivibrator | Expired / Lapsed | 1943-01-06 | 1948-05-18 | 0 | Details |
| US2440777A | Tridimensional radio direction indicator | Expired / Lapsed | 1946-01-31 | 1948-05-04 | 0 | Details |
| US2440261A | Radio locator test apparatus | Expired / Lapsed | 1945-05-30 | 1948-04-27 | 0 | Details |
| US2439044A | Course softening system | Expired / Lapsed | 1943-03-04 | 1948-04-06 | 0 | Details |
| US2438913A | High-frequency filter structure | Expired / Lapsed | 1942-09-02 | 1948-04-06 | 0 | Details |
| US2437251A | Stabilized radio direction finder and homing device | Expired / Lapsed | 1943-08-21 | 1948-03-09 | 0 | Details |
| US2437286A | Radar device | Expired / Lapsed | 1943-08-17 | 1948-03-09 | 0 | Details |
| US2436408A | Radio wave reflecting transducer system | Expired / Lapsed | 1943-05-27 | 1948-02-24 | 0 | Details |
| US2435958A | Pulse generator | Expired / Lapsed | 1943-08-19 | 1948-02-17 | 0 | Details |
| US2417506A | Automatic iris control | Expired / Lapsed | 1944-09-14 | 1947-03-18 | 0 | Details |
| US2415866A | Punching device | Expired / Lapsed | 1945-01-03 | 1947-02-18 | 0 | Details |
| US2412537A | Recording and computing machine | Expired / Lapsed | 1940-12-10 | 1946-12-10 | 0 | Details |
| US2398340A | Manufacture of vacuum apparatus | Expired / Lapsed | 1944-07-11 | 1946-04-09 | 0 | Details |
| US2368951A | Shaver motor | Expired / Lapsed | 1942-06-27 | 1945-02-06 | 0 | Details |
| US2338524A | Method of making electrical terminal fixtures | Expired / Lapsed | 1940-06-08 | 1944-01-04 | 0 | Details |
| US2323833A | Electric decoding device | Expired / Lapsed | 1940-05-17 | 1943-07-06 | 0 | Details |
| US2323824A | Code interpreting mechanism | Expired / Lapsed | 1938-02-15 | 1943-07-06 | 0 | Details |
| US2302055A | Shearing head | Expired / Lapsed | 1939-02-21 | 1942-11-17 | 0 | Details |
| US2280920A | Computing machine | Expired / Lapsed | 1939-03-17 | 1942-04-28 | 0 | Details |
| US2274071A | Interconnection system | Expired / Lapsed | 1939-08-25 | 1942-02-24 | 0 | Details |
| US2208050A | Cash register | Expired / Lapsed | 1937-06-10 | 1940-07-16 | 0 | Details |
| US2203355A | Statistical card punch | Expired / Lapsed | 1938-07-23 | 1940-06-04 | 0 | Details |
| US2185260A | Tabulating machine | Expired / Lapsed | 1936-03-05 | 1940-01-02 | 0 | Details |
| US2174180A | Museum and display case | Expired / Lapsed | 1937-10-12 | 1939-09-26 | 0 | Details |
| US2172758A | Statistical card punch | Expired / Lapsed | 1938-07-01 | 1939-09-12 | 0 | Details |
| US2165556A | Accounting system and machine | Expired / Lapsed | 1932-09-28 | 1939-07-11 | 0 | Details |
| US2164425A | Multiple head dry shaver | Expired / Lapsed | 1937-07-09 | 1939-07-04 | 0 | Details |
| US2160113A | Bowden wire | Expired / Lapsed | 1937-09-28 | 1939-05-30 | 0 | Details |
| US2148170A | Clutch mechanism | Expired / Lapsed | 1937-01-08 | 1939-02-21 | 0 | Details |
| US2124182A | Multicontact plug | Expired / Lapsed | 1937-05-20 | 1938-07-19 | 0 | Details |
| US2124177A | Tabulating machine | Expired / Lapsed | 1931-05-08 | 1938-07-19 | 0 | Details |
| DE647638C | Calculating machine or the like | Expired / Lapsed | 1931-07-23 | 1937-07-14 | 0 | Details |
| US2059277A | Tabulating machine | Expired / Lapsed | 1932-04-02 | 1936-11-03 | 0 | Details |
| US2054811A | Statistical card | Expired / Lapsed | 1921-08-30 | 1936-09-22 | 0 | Details |
| US2034104A | Printing interpreters | Expired / Lapsed | 1932-10-12 | 1936-03-17 | 0 | Details |
| US2027916A | Addressing machine | Expired / Lapsed | 1932-06-13 | 1936-01-14 | 0 | Details |
| US2026500A | Filing device and method of making the same | Expired / Lapsed | 1931-02-17 | 1935-12-31 | 0 | Details |
| US2005450A | Paper feeding mechanism | Expired / Lapsed | 1933-12-09 | 1935-06-18 | 0 | Details |
| US2004208A | Punching machine | Expired / Lapsed | 1932-06-13 | 1935-06-11 | 0 | Details |
| US2004282A | Driving mechanism for calculating machines | Expired / Lapsed | 1930-03-19 | 1935-06-11 | 0 | Details |
| US1976198A | Loose leaf binder | Expired / Lapsed | 1931-03-06 | 1934-10-09 | 0 | Details |
| US1931118A | Supporting stand for business machines | Expired / Lapsed | 1931-12-30 | 1933-10-17 | 0 | Details |
| US1919433A | Photographic copying apparatus | Expired / Lapsed | 1926-04-17 | 1933-07-25 | 0 | Details |
| US1853050A | Calculating machine | Expired / Lapsed | 1926-01-29 | 1932-04-12 | 0 | Details |
| US1774238A | Card index | Expired / Lapsed | 1922-12-12 | 1930-08-26 | 0 | Details |
| US1730513A | Operating mechanism for tabulating and like machines | Expired / Lapsed | 1927-06-07 | 1929-10-08 | 0 | Details |
| US1686780A | Binder | Expired / Lapsed | 1924-04-07 | 1928-10-09 | 0 | Details |
| US1658363A | Accounting apparatus | Expired / Lapsed | 1920-06-21 | 1928-02-07 | 0 | Details |
| US974937A | Adding-machine. | Expired / Lapsed | 1909-02-06 | 1910-11-08 | 0 | Details |