Motorola Solutions Inc
Motorola SActive Patents
0
Total Holdings
507
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US20030041048A1 | System and method for providing dymanic selection of commun… | Expired / Lapsed | 2001-08-15 | — | 27 | Details |
| EP0840474A2 | Reconfigurable transceiver for asymmetric communication sys… | Expired / Lapsed | 1997-10-28 | — | 10 | Details |
| WO1998000928A1 | Method and apparatus for power control in a communication s… | Expired / Lapsed | 1997-03-27 | — | 0 | Details |
| WO1997013334A1 | A method and apparatus for controlling calls in a code divi… | Expired / Lapsed | 1996-08-05 | — | 0 | Details |
| EP0601293A2 | Intelligent position tracking | Expired / Lapsed | 1993-09-23 | — | 10 | Details |
| EP0352787A2 | High bit rate communication system for overcoming multipath | Expired / Lapsed | 1989-07-27 | — | 23 | Details |
| WO1987001490A1 | Radiotelephone system employing digitized speech/data and e… | Expired / Lapsed | 1986-07-11 | — | 0 | Details |
| EP0208537A2 | Communication systems | Expired / Lapsed | 1986-07-08 | — | 14 | Details |
| EP0412583A2 | Method and apparatus for controlling a TDM communication de… | Expired / Lapsed | 1986-03-25 | — | 12 | Details |
| EP0023074A1 | Data encryption/decryption system and method for generating… | Expired / Lapsed | 1980-03-25 | — | 12 | Details |
| DE2652967A1 | CONTROL DEVICE FOR A MESSAGE SYSTEM | Expired / Lapsed | 1976-11-22 | — | 0 | Details |
| DE2365043A1 | RADIO TELEPHONE SYSTEM WITH PORTABLE OR MOBILE UNITS | Expired / Lapsed | 1973-12-28 | — | 0 | Details |
| DE2318027B2 | Electroacoustic transducer with a piezoelectric flexural os… | Expired / Lapsed | 1973-04-10 | — | 0 | Details |
| US6133833A | Wireless add-on keyboard system and method | Expired / Lapsed | 1999-02-25 | 2000-10-17 | 28 | Details |
| US6100628A | Electron emissive film and method | Expired / Lapsed | 1999-05-28 | 2000-08-08 | 7 | Details |
| US6040773A | Radio frequency identification tag arranged for magneticall… | Expired / Lapsed | 1998-03-12 | 2000-03-21 | 102 | Details |
| US6030392A | Connector for hollow anatomical structures and methods of u… | Expired / Lapsed | 1997-05-19 | 2000-02-29 | 28 | Details |
| US5666651A | Method and apparatus for scheduling message traffic in a mu… | Expired / Lapsed | 1995-06-07 | 1997-09-09 | 41 | Details |
| US5555446A | Selective call receiver capable of requesting information f… | Expired / Lapsed | 1995-02-21 | 1996-09-10 | 20 | Details |
| US5502676A | Integrated circuit memory with column redundancy having sha… | Expired / Lapsed | 1995-04-24 | 1996-03-26 | 25 | Details |
| US5446447A | RF tagging system including RF tags with variable frequency… | Expired / Lapsed | 1994-02-16 | 1995-08-29 | 44 | Details |
| US5371901A | Remote voice control system | Expired / Lapsed | 1994-03-04 | 1994-12-06 | 12 | Details |
| US5348616A | Method for patterning a mold | Expired / Lapsed | 1993-05-03 | 1994-09-20 | 25 | Details |
| US5345524A | Optoelectronic transceiver sub-module and method for making | Expired / Lapsed | 1993-05-20 | 1994-09-06 | 16 | Details |
| US5325394A | Method and apparatus for canceling spread-spectrum noise | Expired / Lapsed | 1993-03-03 | 1994-06-28 | 24 | Details |
| US5227774A | Selective call receiver including a right angle elastomeric… | Expired / Lapsed | 1991-04-01 | 1993-07-13 | 17 | Details |
| US5222104A | Gain control circuit for radio transmitter | Expired / Lapsed | 1991-12-30 | 1993-06-22 | 24 | Details |
| US5202912A | Method and apparatus for providing telepoint to telepoint c… | Expired / Lapsed | 1991-09-09 | 1993-04-13 | 27 | Details |
| US5180951A | Electron device electron source including a polycrystalline… | Expired / Lapsed | 1992-02-05 | 1993-01-19 | 26 | Details |
| US5175759A | Communications device with movable element control interface | Expired / Lapsed | 1989-11-20 | 1992-12-29 | 6 | Details |
| US5172321A | Vehicle route planning system | Expired / Lapsed | 1990-12-10 | 1992-12-15 | 24 | Details |
| US5170476A | Data processor having a deferred cache load | Expired / Lapsed | 1990-01-22 | 1992-12-08 | 17 | Details |
| US5157693A | Digital modulation circuit | Expired / Lapsed | 1991-04-01 | 1992-10-20 | 41 | Details |
| US5141460A | Method of making a field emission electron source employing… | Expired / Lapsed | 1991-08-20 | 1992-08-25 | 20 | Details |
| US5138237A | Field emission electron device employing a modulatable diam… | Expired / Lapsed | 1991-08-20 | 1992-08-11 | 61 | Details |
| US5128959A | Variable bandwidth CDMA radio system | Expired / Lapsed | 1991-02-22 | 1992-07-07 | 16 | Details |
| US5115429A | Dynamic encoding rate control minimizes traffic congestion … | Expired / Lapsed | 1990-08-02 | 1992-05-19 | 14 | Details |
| US5101460A | Simultaneous bidirectional optical interconnect | Expired / Lapsed | 1990-09-04 | 1992-03-31 | 17 | Details |
| US5079476A | Encapsulated field emission device | Expired / Lapsed | 1990-02-09 | 1992-01-07 | 5 | Details |
| US5047762A | Method and apparatus for increasing co-channel utilization … | Expired / Lapsed | 1989-12-06 | 1991-09-10 | 28 | Details |
| US5040238A | Trunking system communication resource reuse method | Expired / Lapsed | 1990-06-29 | 1991-08-13 | 6 | Details |
| US4998111A | CPS transform correlation receiver and method | Expired / Lapsed | 1989-11-27 | 1991-03-05 | 11 | Details |
| US4992676A | Output buffer having distributed stages to reduce switching… | Expired / Lapsed | 1989-05-01 | 1991-02-12 | 9 | Details |
| US4989230A | Cellular cordless telephone | Expired / Lapsed | 1988-09-23 | 1991-01-29 | 26 | Details |
| US4903327A | Cellular telephone with transmission-on and radio-on timers | Expired / Lapsed | 1989-02-03 | 1990-02-20 | 6 | Details |
| US4893351A | Communication receiver having a remote alert device | Expired / Lapsed | 1987-09-02 | 1990-01-09 | 24 | Details |
| US4893271A | Synthesized clock microcomputer with power saving | Expired / Lapsed | 1987-02-26 | 1990-01-09 | 26 | Details |
| US4882579A | Code division multiplexed acknowledge back paging system | Expired / Lapsed | 1988-01-07 | 1989-11-21 | 27 | Details |
| US4876740A | Radiotelephone system employing digitized speech/data signa… | Expired / Lapsed | 1989-02-13 | 1989-10-24 | 25 | Details |
| US4870686A | Method for entering digit sequences by voice command | Expired / Lapsed | 1987-10-19 | 1989-09-26 | 37 | Details |
| US4860341A | Radiotelephone credit card call approval synchronization | Expired / Lapsed | 1989-02-13 | 1989-08-22 | 8 | Details |
| US4860336A | Radiotelephone credit card data communications | Expired / Lapsed | 1988-01-15 | 1989-08-22 | 10 | Details |
| US4843343A | Enhanced Q current mode active filter | Expired / Lapsed | 1988-01-04 | 1989-06-27 | 19 | Details |
| US4825193A | Acknowledge back pager with adaptive variable transmitter o… | Expired / Lapsed | 1988-01-07 | 1989-04-25 | 19 | Details |
| US4813073A | Echo cancellation | Expired / Lapsed | 1987-07-02 | 1989-03-14 | 22 | Details |
| US4811380A | Cellular radiotelephone system with dropped call protection | Expired / Lapsed | 1988-01-29 | 1989-03-07 | 42 | Details |
| US4804937A | Vehicle monitoring arrangement and system | Expired / Lapsed | 1987-05-26 | 1989-02-14 | 6 | Details |
| US4799253A | Colocated cellular radiotelephone systems | Expired / Lapsed | 1987-07-20 | 1989-01-17 | 16 | Details |
| US4797948A | Vehicle identification technique for vehicle monitoring sys… | Expired / Lapsed | 1987-07-22 | 1989-01-10 | 22 | Details |
| US4794635A | Two-way radio communication system with max-minimum call as… | Expired / Lapsed | 1986-11-28 | 1988-12-27 | 43 | Details |
| USRE32789E | Transmission trunk multichannel dispatch system with priori… | Expired / Lapsed | 1983-11-04 | 1988-11-22 | 46 | Details |
| US4785463A | Digital global positioning system receiver | Expired / Lapsed | 1985-09-03 | 1988-11-15 | 44 | Details |
| US4775999A | Registration of radiotelephones in networked cellular radio… | Expired / Lapsed | 1987-12-07 | 1988-10-04 | 10 | Details |
| US4737978A | Networked cellular radiotelephone systems | Expired / Lapsed | 1986-10-31 | 1988-04-12 | 17 | Details |
| US4723264A | Signalling method for establishing trunked communication | Expired / Lapsed | 1987-06-19 | 1988-02-02 | 23 | Details |
| US4704685A | Failsafe engine fuel control system | Expired / Lapsed | 1985-01-18 | 1987-11-03 | 20 | Details |
| US4701883A | ECL/CMOS memory cell with separate read and write bit lines | Expired / Lapsed | 1986-06-19 | 1987-10-20 | 19 | Details |
| US4701934A | Method of doppler searching in a digital GPS receiver | Expired / Lapsed | 1985-09-03 | 1987-10-20 | 18 | Details |
| US4700375A | Battery charging, reset, and data transfer system | Expired / Lapsed | 1987-01-05 | 1987-10-13 | 9 | Details |
| US4686552A | Integrated circuit trench cell | Expired / Lapsed | 1986-05-20 | 1987-08-11 | 18 | Details |
| US4677528A | Flexible printed circuit board having integrated circuit di… | Expired / Lapsed | 1986-01-27 | 1987-06-30 | 4 | Details |
| US4675666A | System and method for altering an aspect of one of a plural… | Expired / Lapsed | 1986-05-27 | 1987-06-23 | 4 | Details |
| US4670906A | Data communications system transmitter selection method and… | Expired / Lapsed | 1986-08-06 | 1987-06-02 | 33 | Details |
| US4670747A | Alphanumeric entry system having an electronic lock feature | Expired / Lapsed | 1985-11-19 | 1987-06-02 | 9 | Details |
| US4661992A | Switchless external antenna connector for portable radios | Expired / Lapsed | 1985-07-31 | 1987-04-28 | 11 | Details |
| US4654867A | Cellular voice and data radiotelephone system | Expired / Lapsed | 1986-08-11 | 1987-03-31 | 72 | Details |
| US4654655A | Multi-user serial data bus | Expired / Lapsed | 1984-03-02 | 1987-03-31 | 18 | Details |
| US4636741A | Multi-level power amplifying circuitry for portable radio t… | Expired / Lapsed | 1985-11-01 | 1987-01-13 | 35 | Details |
| US4631496A | Battery saving system for a frequency synthesizer | Expired / Lapsed | 1985-12-13 | 1986-12-23 | 18 | Details |
| US4612415A | Dynamic control of telephone traffic in a trunked radio sys… | Expired / Lapsed | 1984-08-03 | 1986-09-16 | 26 | Details |
| US4602218A | Automatic output control circuitry for RF power amplifiers … | Expired / Lapsed | 1985-04-30 | 1986-07-22 | 27 | Details |
| US4600922A | Paging universal remote control encoder | Expired / Lapsed | 1985-09-11 | 1986-07-15 | 12 | Details |
| US4595885A | Adjustable active filter | Expired / Lapsed | 1984-10-01 | 1986-06-17 | 10 | Details |
| US4594657A | Semaphore for memory shared by two asynchronous microcomput… | Expired / Lapsed | 1983-04-22 | 1986-06-10 | 14 | Details |
| US4593155A | Portable telephone ID code transfer system | Expired / Lapsed | 1985-10-11 | 1986-06-03 | 40 | Details |
| US4590473A | Data signalling system | Expired / Lapsed | 1982-07-28 | 1986-05-20 | 12 | Details |
| US4584709A | Homotropic antenna system for portable radio | Expired / Lapsed | 1983-07-06 | 1986-04-22 | 19 | Details |
| US4573207A | Queued community repeater communications system | Expired / Lapsed | 1983-12-22 | 1986-02-25 | 34 | Details |
| US4571595A | Dual band transceiver antenna | Expired / Lapsed | 1983-12-05 | 1986-02-18 | 8 | Details |
| US4553262A | Communications system enabling radio link access for non-tr… | Expired / Lapsed | 1983-11-25 | 1985-11-12 | 23 | Details |
| US4550443A | Method and apparatus for dynamically selecting transmitters… | Expired / Lapsed | 1984-09-24 | 1985-10-29 | 4 | Details |
| US4540867A | Linearized scanning system and method for an energy beam | Expired / Lapsed | 1984-06-25 | 1985-09-10 | 19 | Details |
| US4531235A | Diversity signal strength indicator and site selection appa… | Expired / Lapsed | 1983-06-20 | 1985-07-23 | 35 | Details |
| US4525861A | Zoned data communications system for communicating message … | Expired / Lapsed | 1984-08-13 | 1985-06-25 | 3 | Details |
| US4519068A | Method and apparatus for communicating variable length mess… | Expired / Lapsed | 1983-07-11 | 1985-05-21 | 16 | Details |
| US4486624A | Microprocessor controlled radiotelephone transceiver | Expired / Lapsed | 1980-09-15 | 1984-12-04 | 17 | Details |
| US4485486A | Method and apparatus for assigning duplex radio channels an… | Expired / Lapsed | 1984-02-06 | 1984-11-27 | 79 | Details |
| US4481670A | Method and apparatus for dynamically selecting transmitters… | Expired / Lapsed | 1982-11-12 | 1984-11-06 | 42 | Details |
| US4479245A | Same frequency repeater for a multiple repeater system | Expired / Lapsed | 1982-12-21 | 1984-10-23 | 12 | Details |
| US4477919A | Range control circuit for counter to be used in a frequency… | Expired / Lapsed | 1981-04-06 | 1984-10-16 | 10 | Details |
| US4468813A | Digital voice storage system | Expired / Lapsed | 1982-12-06 | 1984-08-28 | 10 | Details |
| US4465075A | On-chip pressure transducer and temperature compensation ci… | Expired / Lapsed | 1982-03-29 | 1984-08-14 | 11 | Details |
| US4466001A | Polling system for multiple terminal units | Expired / Lapsed | 1981-12-04 | 1984-08-14 | 6 | Details |
| US4459497A | Sense amplifier using different threshold MOS devices | Expired / Lapsed | 1982-01-25 | 1984-07-10 | 17 | Details |
| US4456828A | Optoelectronic coupler housing | Expired / Lapsed | 1979-10-15 | 1984-06-26 | 3 | Details |
| US4451824A | Color convergence data processing in a CRT color display st… | Expired / Lapsed | 1982-06-21 | 1984-05-29 | 20 | Details |
| US4439006A | Low cost electro-optical connector | Expired / Lapsed | 1981-05-18 | 1984-03-27 | 12 | Details |
| US4432089A | Digital loop transceiver for interfacing a digital PABX to … | Expired / Lapsed | 1981-12-24 | 1984-02-14 | 24 | Details |
| US4430742A | Data muting method and apparatus for radio communications s… | Expired / Lapsed | 1981-11-20 | 1984-02-07 | 34 | Details |
| US4424514A | Decoder for transmitted message activation code | Expired / Lapsed | 1981-10-13 | 1984-01-03 | 0 | Details |
| US4419668A | Combined tone only and tone voice multiple alert pager | Expired / Lapsed | 1981-09-25 | 1983-12-06 | 18 | Details |
| US4414504A | Fractional doppler counting | Expired / Lapsed | 1980-11-05 | 1983-11-08 | 9 | Details |
| US4408305A | Memory with permanent array division capability | Expired / Lapsed | 1981-09-28 | 1983-10-04 | 8 | Details |
| US4400584A | Speakerphone for radio and, landline telephones | Expired / Lapsed | 1982-04-05 | 1983-08-23 | 30 | Details |
| US4400664A | Digital phase detector | Expired / Lapsed | 1981-05-26 | 1983-08-23 | 7 | Details |
| US4398265A | Keyboard and display interface adapter architecture | Expired / Lapsed | 1980-09-15 | 1983-08-09 | 14 | Details |
| US4388672A | Printed circuit board assembly | Expired / Lapsed | 1981-05-01 | 1983-06-14 | 11 | Details |
| US4378469A | Human voice analyzing apparatus | Expired / Lapsed | 1981-05-26 | 1983-03-29 | 19 | Details |
| US4371598A | Method for fabricating aligned patterns on the opposed surf… | Expired / Lapsed | 1981-07-06 | 1983-02-01 | 5 | Details |
| US4369520A | Instantaneously acquiring sector antenna combining system | Expired / Lapsed | 1979-03-22 | 1983-01-18 | 10 | Details |
| US4354252A | Programmable digital data terminal for mobile radio transce… | Expired / Lapsed | 1981-02-02 | 1982-10-12 | 23 | Details |
| US4353119A | Adaptive antenna array including batch covariance relaxatio… | Expired / Lapsed | 1980-06-13 | 1982-10-05 | 18 | Details |
| US4340868A | Current mode biquadratic active filter | Expired / Lapsed | 1980-05-12 | 1982-07-20 | 19 | Details |
| US4312047A | Memory array having improved isolation between sense lines | Expired / Lapsed | 1980-05-29 | 1982-01-19 | 10 | Details |
| US4308581A | Single step system for a microcomputer | Expired / Lapsed | 1979-09-28 | 1981-12-29 | 16 | Details |
| US4307445A | Microprogrammed control apparatus having a two-level contro… | Expired / Lapsed | 1978-11-17 | 1981-12-22 | 4 | Details |
| US4302845A | Phase-encoded data signal demodulator | Expired / Lapsed | 1980-02-07 | 1981-11-24 | 18 | Details |
| US4301531A | Three-party conference circuit for digital time-division-mu… | Expired / Lapsed | 1979-07-02 | 1981-11-17 | 16 | Details |
| US4291475A | Labelling device | Expired / Lapsed | 1980-05-08 | 1981-09-29 | 4 | Details |
| US4251784A | Apparatus for parallel combining an odd number of semicondu… | Expired / Lapsed | 1979-12-17 | 1981-02-17 | 15 | Details |
| US4247908A | Re-linked portable data terminal controller system | Expired / Lapsed | 1978-12-08 | 1981-01-27 | 13 | Details |
| US4237547A | Program decoder for shared contact eprom | Expired / Lapsed | 1979-09-17 | 1980-12-02 | 11 | Details |
| US4237534A | Bus arbiter | Expired / Lapsed | 1978-11-13 | 1980-12-02 | 6 | Details |
| US4234924A | Method of introducing a baseline measurement into electroni… | Expired / Lapsed | 1978-09-11 | 1980-11-18 | 6 | Details |
| US4233565A | Method and apparatus for a PSK signal detector | Expired / Lapsed | 1979-06-29 | 1980-11-11 | 20 | Details |
| US4231093A | Method of returning to a last point in a path after a tempo… | Expired / Lapsed | 1978-09-11 | 1980-10-28 | 3 | Details |
| US4231114A | Synchronizing means for a two-way communication system | Expired / Lapsed | 1978-02-27 | 1980-10-28 | 7 | Details |
| US4229822A | Data detector for a data communication system | Expired / Lapsed | 1979-01-29 | 1980-10-21 | 13 | Details |
| US4224537A | Modified semiconductor temperature sensor | Expired / Lapsed | 1978-11-16 | 1980-09-23 | 8 | Details |
| US4220820A | Control circuitry for a radio telephone | Expired / Lapsed | 1978-10-02 | 1980-09-02 | 31 | Details |
| US4220876A | Bus terminating and decoupling circuit | Expired / Lapsed | 1978-08-17 | 1980-09-02 | 14 | Details |
| US4216463A | Programmable digital tone detector | Expired / Lapsed | 1978-08-10 | 1980-08-05 | 12 | Details |
| US4209357A | Plasma reactor apparatus | Expired / Lapsed | 1979-05-18 | 1980-06-24 | 30 | Details |
| US4209131A | Computer-controlled irrigation system | Expired / Lapsed | 1978-05-12 | 1980-06-24 | 38 | Details |
| US4201960A | Method for automatically matching a radio frequency transmi… | Expired / Lapsed | 1978-05-24 | 1980-05-06 | 35 | Details |
| US4200912A | Processor interrupt system | Expired / Lapsed | 1978-07-31 | 1980-04-29 | 13 | Details |
| US4190849A | Electronic-beam programmable semiconductor device structure | Expired / Lapsed | 1977-09-19 | 1980-02-26 | 2 | Details |
| US4188582A | Simulcast transmission system having phase-locked remote tr… | Expired / Lapsed | 1978-04-10 | 1980-02-12 | 19 | Details |
| US4181893A | Battery saver for a tone coded signalling system | Expired / Lapsed | 1976-12-30 | 1980-01-01 | 41 | Details |
| US4175256A | Dynamic threshold tone detector | Expired / Lapsed | 1976-07-30 | 1979-11-20 | 10 | Details |
| US4161662A | Standardized digital logic chip | Expired / Lapsed | 1977-11-07 | 1979-07-17 | 4 | Details |
| US4161733A | Null steering apparatus including weight oscillation elimin… | Expired / Lapsed | 1977-09-19 | 1979-07-17 | 10 | Details |
| US4157818A | X-Y Movable work holder | Expired / Lapsed | 1977-12-01 | 1979-06-12 | 8 | Details |
| US4156867A | Data communication system with random and burst error prote… | Expired / Lapsed | 1977-09-06 | 1979-05-29 | 11 | Details |
| US4140060A | Subcarrier modulated optical transceiver | Expired / Lapsed | 1975-05-19 | 1979-02-20 | 17 | Details |
| US4128885A | Digital circuitry for spark timing and exhaust gas recircul… | Expired / Lapsed | 1977-05-18 | 1978-12-05 | 25 | Details |
| US4128740A | Antenna array for a cellular RF communications system | Expired / Lapsed | 1977-02-14 | 1978-12-05 | 15 | Details |
| US4124879A | Illumination apparatus for use in an illuminatable pushbutt… | Expired / Lapsed | 1977-05-20 | 1978-11-07 | 10 | Details |
| US4121162A | Digital phase locked loop tuning system | Expired / Lapsed | 1976-06-14 | 1978-10-17 | 27 | Details |
| US4103286A | Digital binary group call circuitry arrangement | Expired / Lapsed | 1977-02-22 | 1978-07-25 | 10 | Details |
| US4101836A | Sectored antenna receiving system | Expired / Lapsed | 1977-05-02 | 1978-07-18 | 26 | Details |
| US4096571A | System for resolving memory access conflicts among processo… | Expired / Lapsed | 1976-09-08 | 1978-06-20 | 33 | Details |
| US4091318A | Charger/converter console with reel arrangement | Expired / Lapsed | 1977-02-16 | 1978-05-23 | 17 | Details |
| US4088832A | Split phase code synchronizer and demodulator | Expired / Lapsed | 1976-10-12 | 1978-05-09 | 18 | Details |
| US4087855A | Valid memory address enable system for a microprocessor sys… | Expired / Lapsed | 1975-09-17 | 1978-05-02 | 7 | Details |
| US4085378A | QPSK demodulator | Expired / Lapsed | 1976-11-26 | 1978-04-18 | 4 | Details |
| US4071887A | Synchronous serial data adaptor | Expired / Lapsed | 1975-10-30 | 1978-01-31 | 24 | Details |
| US4069510A | Interrupt status register for interface adaptor chip | Expired / Lapsed | 1976-05-24 | 1978-01-17 | 10 | Details |
| US4067011A | Digital transponder universal pulse assembly | Expired / Lapsed | 1976-10-22 | 1978-01-03 | 8 | Details |
| US4056779A | Vehicular repeater | Expired / Lapsed | 1976-04-05 | 1977-11-01 | 25 | Details |
| US4056780A | Vehicle repeater prioritization system | Expired / Lapsed | 1975-06-25 | 1977-11-01 | 39 | Details |
| US4053739A | Dual modulus programmable counter | Expired / Lapsed | 1976-08-11 | 1977-10-11 | 8 | Details |
| US4053889A | Non-linear spread spectrum transmitter/receiver for a homin… | Expired / Lapsed | 1976-07-27 | 1977-10-11 | 4 | Details |
| US4052672A | Extended phase-range, high fidelity modulator arrangement | Expired / Lapsed | 1976-07-22 | 1977-10-04 | 6 | Details |
| US4045796A | Correlation system for pseudo-random noise signals | Expired / Lapsed | 1976-11-12 | 1977-08-30 | 21 | Details |
| US4040035A | Microprocessor having index register coupled to serial-coup… | Expired / Lapsed | 1975-09-18 | 1977-08-02 | 5 | Details |
| US4037306A | Integrated circuit and method | Expired / Lapsed | 1975-10-02 | 1977-07-26 | 6 | Details |
| US4037158A | Two-way FM radio system operating on a single channel and p… | Expired / Lapsed | 1976-03-31 | 1977-07-19 | 14 | Details |
| US4037204A | Microprocessor interrupt logic | Expired / Lapsed | 1975-09-17 | 1977-07-19 | 3 | Details |
| US4032204A | Adjustable mounting arrangement for electronic apparatus | Expired / Lapsed | 1976-06-21 | 1977-06-28 | 10 | Details |
| US4032886A | Concatenation technique for burst-error correction and sync… | Expired / Lapsed | 1975-12-01 | 1977-06-28 | 14 | Details |
| US4032896A | Microprocessor having index register coupled to serial-coup… | Expired / Lapsed | 1975-09-17 | 1977-06-28 | 4 | Details |
| US4030079A | Processor including incrementor and program register struct… | Expired / Lapsed | 1976-09-02 | 1977-06-14 | 5 | Details |
| US4028560A | Contact bounce transient pulse circuit eliminator | Expired / Lapsed | 1975-10-08 | 1977-06-07 | 6 | Details |
| US4021653A | Digital programmable tone detector | Expired / Lapsed | 1975-10-14 | 1977-05-03 | 28 | Details |
| US4019141A | Preselector cavity arrangement and RF selectivity assembly | Expired / Lapsed | 1976-03-22 | 1977-04-19 | 9 | Details |
| US4018202A | High energy adaptive ignition via digital control | Expired / Lapsed | 1975-11-20 | 1977-04-19 | 16 | Details |
| US4019150A | PA protection circuit for a single sideband radio | Expired / Lapsed | 1975-11-17 | 1977-04-19 | 9 | Details |
| US4019068A | Low power output disable circuit for random access memory | Expired / Lapsed | 1975-09-02 | 1977-04-19 | 6 | Details |
| US4012597A | Transmission trunk multichannel dispatch system with priori… | Expired / Lapsed | 1975-11-24 | 1977-03-15 | 44 | Details |
| US4010448A | Interrupt circuitry for microprocessor chip | Expired / Lapsed | 1974-10-30 | 1977-03-01 | 7 | Details |
| US4010355A | Semiconductor wafer having machine readable indicies | Expired / Lapsed | 1974-06-10 | 1977-03-01 | 18 | Details |
| US4004949A | Method of making silicon solar cells | Expired / Lapsed | 1975-01-06 | 1977-01-25 | 12 | Details |
| US4004285A | Read-write circuitry for one transistor per bit random acce… | Expired / Lapsed | 1975-06-30 | 1977-01-18 | 18 | Details |
| US4003035A | Complementary field effect transistor sense amplifier for o… | Expired / Lapsed | 1975-07-03 | 1977-01-11 | 17 | Details |
| US4003028A | Interrupt circuitry for microprocessor chip | Expired / Lapsed | 1974-10-30 | 1977-01-11 | 4 | Details |
| US3990078A | Image element antenna array for a monopulse tracking system… | Expired / Lapsed | 1975-01-06 | 1976-11-02 | 8 | Details |
| US3988644A | Current protection circuit | Expired / Lapsed | 1975-09-26 | 1976-10-26 | 11 | Details |
| US3988730A | Multiple parameter monitoring and readout system with sampl… | Expired / Lapsed | 1974-12-31 | 1976-10-26 | 24 | Details |
| US3987344A | Plug-in module for electronic device having self-contained … | Expired / Lapsed | 1975-03-10 | 1976-10-19 | 10 | Details |
| US3986174A | Communication switching system | Expired / Lapsed | 1974-05-02 | 1976-10-12 | 14 | Details |
| US3984776A | Signal quality detector | Expired / Lapsed | 1975-11-19 | 1976-10-05 | 9 | Details |
| US3983498A | Digital phase lock loop | Expired / Lapsed | 1975-11-13 | 1976-09-28 | 23 | Details |
| US3979730A | Interface adaptor having control register | Expired / Lapsed | 1974-10-30 | 1976-09-07 | 14 | Details |
| US3977934A | Silicon manufacture | Expired / Lapsed | 1975-01-02 | 1976-08-31 | 6 | Details |
| US3975712A | Asynchronous communication interface adaptor | Expired / Lapsed | 1975-02-18 | 1976-08-17 | 23 | Details |
| US3969168A | Method for filling grooves and moats used on semiconductor … | Expired / Lapsed | 1974-11-29 | 1976-07-13 | 13 | Details |
| US3966577A | Dielectrically isolated semiconductor devices | Expired / Lapsed | 1974-05-03 | 1976-06-29 | 8 | Details |
| US3962553A | Portable telephone system having a battery saver feature | Expired / Lapsed | 1974-10-29 | 1976-06-08 | 12 | Details |
| US3956033A | Method of fabricating an integrated semiconductor transisto… | Expired / Lapsed | 1974-12-04 | 1976-05-11 | 6 | Details |
| US3953794A | Digital phase detector | Expired / Lapsed | 1975-03-27 | 1976-04-27 | 9 | Details |
| US3943915A | Intracranial pressure sensing device | Expired / Lapsed | 1974-11-29 | 1976-03-16 | 11 | Details |
| US3944925A | Phase-locked loop transceiver having automatic frequency of… | Expired / Lapsed | 1974-08-05 | 1976-03-16 | 9 | Details |
| US3942162A | Pre-conditioning circuits for MOS integrated circuits | Expired / Lapsed | 1974-07-01 | 1976-03-02 | 13 | Details |
| US3934060A | Method for forming a deposited silicon dioxide layer on a s… | Expired / Lapsed | 1973-12-19 | 1976-01-20 | 7 | Details |
| US3924079A | Latching multiplexer circuit | Expired / Lapsed | 1974-01-02 | 1975-12-02 | 9 | Details |
| US3922602A | Lock detector for a phase locked loop | Expired / Lapsed | 1974-10-11 | 1975-11-25 | 8 | Details |
| US3922647A | External exclusive OR type circuit for inverting cell MOS R… | Expired / Lapsed | 1974-06-03 | 1975-11-25 | 10 | Details |
| US3917372A | Supporting and connecting structure for electric device | Expired / Lapsed | 1974-10-03 | 1975-11-04 | 21 | Details |
| US3909325A | Polycrystalline etch | Expired / Lapsed | 1974-06-28 | 1975-09-30 | 11 | Details |
| US3906255A | MOS current limiting output circuit | Expired / Lapsed | 1974-09-06 | 1975-09-16 | 4 | Details |
| US3906464A | External data control preset system for inverting cell rand… | Expired / Lapsed | 1974-06-03 | 1975-09-16 | 9 | Details |
| US3893149A | Scannable light emitting diode array and method | Expired / Lapsed | 1974-04-15 | 1975-07-01 | 4 | Details |
| US3886583A | Insulated gate-field-effect transistor | Expired / Lapsed | 1973-10-23 | 1975-05-27 | 3 | Details |
| US3886554A | Method and apparatus for improving the accuracy of a vehicl… | Expired / Lapsed | 1973-04-23 | 1975-05-27 | 19 | Details |
| US3883807A | Tuning control system | Expired / Lapsed | 1974-05-30 | 1975-05-13 | 19 | Details |
| US3881808A | Liquid crystal light control device having a high transmiss… | Expired / Lapsed | 1973-12-07 | 1975-05-06 | 17 | Details |
| US3876461A | Semiconductor process | Expired / Lapsed | 1973-09-04 | 1975-04-08 | 5 | Details |
| US3866136A | Amplifier protection circuit | Expired / Lapsed | 1973-04-23 | 1975-02-11 | 8 | Details |
| US3858150A | Polycrystalline silicon pressure sensor | Expired / Lapsed | 1973-06-21 | 1974-12-31 | 2 | Details |
| US3851101A | Adaptive phase synchronizer | Expired / Lapsed | 1974-03-04 | 1974-11-26 | 12 | Details |
| US3847687A | Methods of forming self aligned transistor structure having… | Expired / Lapsed | 1972-11-15 | 1974-11-12 | 16 | Details |
| US3838414A | Digital wave synthesizer | Expired / Lapsed | 1972-08-03 | 1974-09-24 | 5 | Details |
| US3832202A | Liquid silica source for semiconductors liquid silica sourc… | Expired / Lapsed | 1972-08-08 | 1974-08-27 | 0 | Details |
| US3825830A | Offset oscillator system for radio transmitter and receiver | Expired / Lapsed | 1972-12-06 | 1974-07-23 | 8 | Details |
| US3821663A | Integral reflecting cavity semiconductor pumped laser | Expired / Lapsed | 1973-01-15 | 1974-06-28 | 9 | Details |
| US3796984A | Electrical and mechanical connector for two part portable e… | Expired / Lapsed | 1972-08-09 | 1974-03-12 | 20 | Details |
| US3795888A | Printed circuit board edge connector requiring zero inserti… | Expired / Lapsed | 1972-06-30 | 1974-03-05 | 4 | Details |
| US3783044A | Photoresist keys and depth indicator | Expired / Lapsed | 1971-04-09 | 1974-01-01 | 0 | Details |
| US3768331A | Micromanipulator utilizing a constant velocity universal jo… | Expired / Lapsed | 1972-11-17 | 1973-10-30 | 11 | Details |
| US3768030A | Automatic signal acquisition means for phase-lock loop with… | Expired / Lapsed | 1972-05-08 | 1973-10-23 | 11 | Details |
| US3764912A | Multiple control point switching system having automatic ac… | Expired / Lapsed | 1972-09-07 | 1973-10-09 | 13 | Details |
| US3763434A | Battery connecting structure for portable device | Expired / Lapsed | 1972-03-02 | 1973-10-02 | 17 | Details |
| US3760380A | Silicon gate complementary mos dynamic ram | Expired / Lapsed | 1972-06-02 | 1973-09-18 | 15 | Details |
| US3760355A | Digital pattern detector | Expired / Lapsed | 1972-03-08 | 1973-09-18 | 19 | Details |
| US3755012A | Controlled anisotropic etching process for fabricating diel… | Expired / Lapsed | 1971-03-19 | 1973-08-28 | 7 | Details |
| US3750032A | Priority channel scanning system with dual response time co… | Expired / Lapsed | 1972-02-24 | 1973-07-31 | 28 | Details |
| US3748480A | Monolithic coupling device including light emitter and ligh… | Expired / Lapsed | 1970-11-02 | 1973-07-24 | 8 | Details |
| US3743850A | Integrated current supply circuit | Expired / Lapsed | 1972-06-12 | 1973-07-03 | 6 | Details |
| US3740658A | Temperature compensated amplifying circuit | Expired / Lapsed | 1970-03-03 | 1973-06-19 | 9 | Details |
| US3735240A | Integrated circuit current regulator with differential ampl… | Expired / Lapsed | 1971-10-15 | 1973-05-22 | 14 | Details |
| US3733519A | Protection circuit for regulated power supplies | Expired / Lapsed | 1972-04-24 | 1973-05-15 | 14 | Details |
| US3733540A | Switching regulator sweep starting protection circuit | Expired / Lapsed | 1972-02-03 | 1973-05-15 | 12 | Details |
| US3729406A | Method of adhering tungsten to glass and for providing a tu… | Expired / Lapsed | 1971-05-10 | 1973-04-24 | 0 | Details |
| US3721841A | Contact for piezoelectric crystals | Expired / Lapsed | 1971-06-16 | 1973-03-20 | 6 | Details |
| US3719862A | Flexible contact members for use in high power electrical d… | Expired / Lapsed | 1972-03-15 | 1973-03-06 | 14 | Details |
| US3719833A | Technique for compensating for input bias currents of trans… | Expired / Lapsed | 1970-10-12 | 1973-03-06 | 13 | Details |
| US3718915A | Opposite conductivity gating circuit for refreshing informa… | Expired / Lapsed | 1971-06-07 | 1973-02-27 | 15 | Details |
| US3718899A | Vehicle monitoring system including automatic preselection … | Expired / Lapsed | 1971-04-05 | 1973-02-27 | 0 | Details |
| US3717514A | Single crystal silicon contact for integrated circuits and … | Expired / Lapsed | 1970-10-06 | 1973-02-20 | 17 | Details |
| US3707765A | Method of making isolated semiconductor devices | Expired / Lapsed | 1970-11-19 | 1973-01-02 | 2 | Details |
| US3701158A | Dual mode wave energy transducer device | Expired / Lapsed | 1970-01-22 | 1972-10-24 | 10 | Details |
| US3698618A | Face bonding machine | Expired / Lapsed | 1971-11-29 | 1972-10-17 | 10 | Details |
| US3696432A | Combined scan and track antennas | Expired / Lapsed | 1971-01-15 | 1972-10-03 | 12 | Details |
| US3690290A | Apparatus for providing epitaxial layers on a substrate | Expired / Lapsed | 1971-04-29 | 1972-09-12 | 4 | Details |
| US3691485A | Three-port quadrature hybrids | Expired / Lapsed | 1970-08-03 | 1972-09-12 | 6 | Details |
| US3688313A | Combined cw and pulse tracking systems | Expired / Lapsed | 1966-12-19 | 1972-08-29 | 27 | Details |
| US3686635A | Integrated circuit decoder responsiver to two sequential to… | Expired / Lapsed | 1971-06-09 | 1972-08-22 | 16 | Details |
| US3683379A | Vehicle control system and equipment | Expired / Lapsed | 1970-10-21 | 1972-08-08 | 12 | Details |
| US3683373A | Solid state display of range and azimuth information | Expired / Lapsed | 1970-01-21 | 1972-08-08 | 13 | Details |
| US3679963A | Neutron radiation and gamma ray hardened adjustable power s… | Expired / Lapsed | 1970-01-30 | 1972-07-25 | 7 | Details |
| US3676722A | Structure for bimorph or monomorph benders | Expired / Lapsed | 1971-04-15 | 1972-07-11 | 17 | Details |
| US3676801A | Stabilized complementary micro-power square wave oscillator | Expired / Lapsed | 1970-10-28 | 1972-07-11 | 13 | Details |
| US3668481A | A hot carrier pn-diode | Expired / Lapsed | 1970-08-10 | 1972-06-06 | 6 | Details |
| US3667045A | Chassis and monitoring arrangement for electrical apparatus | Expired / Lapsed | 1970-06-25 | 1972-05-30 | 13 | Details |
| US3662294A | Microstrip impedance matching circuit with harmonic termina… | Expired / Lapsed | 1970-05-05 | 1972-05-09 | 4 | Details |
| US3659121A | Constant current source | Expired / Lapsed | 1970-11-16 | 1972-04-25 | 5 | Details |
| US3654555A | Carrier and tone squelch circuit with elimination of noise … | Expired / Lapsed | 1970-08-19 | 1972-04-04 | 9 | Details |
| US3649883A | Semiconductor device having a recombination ring | Expired / Lapsed | 1970-08-17 | 1972-03-14 | 5 | Details |
| US3649503A | Sputter etch mask | Expired / Lapsed | 1969-12-03 | 1972-03-14 | 0 | Details |
| US3644883A | Automatic vehicle monitoring identification location alarm … | Expired / Lapsed | 1969-12-29 | 1972-02-22 | 23 | Details |
| US3636782A | Indexing mechanism | Expired / Lapsed | 1969-06-17 | 1972-01-25 | 13 | Details |
| US3626311A | Phase lock loop demodulator providing noise suppression | Expired / Lapsed | 1970-07-30 | 1971-12-07 | 8 | Details |
| US3624355A | Temperature control system | Expired / Lapsed | 1970-10-07 | 1971-11-30 | 15 | Details |
| US3622841A | Triac having increased commutating speed | Expired / Lapsed | 1970-04-16 | 1971-11-23 | 10 | Details |
| US3622419A | Method of packaging an optoelectrical device | Expired / Lapsed | 1969-10-08 | 1971-11-23 | 3 | Details |
| US3623106A | Multifrequency receiver employing tone-coded squelch with a… | Expired / Lapsed | 1969-07-03 | 1971-11-23 | 10 | Details |
| US3617895A | Multifrequency receiver with automatic channel selection an… | Expired / Lapsed | 1969-08-08 | 1971-11-02 | 10 | Details |
| US3614622A | Data transmission method and system | Expired / Lapsed | 1968-04-30 | 1971-10-19 | 3 | Details |
| US3584304A | Squelch tail eliminator for dual squelch | Expired / Lapsed | 1969-06-11 | 1971-06-08 | 10 | Details |
| US3577080A | Remote control system for operation over same audiochannel … | Expired / Lapsed | 1968-12-20 | 1971-05-04 | 21 | Details |
| US3576452A | Photodiode preamplifier circuit for a card reader system | Expired / Lapsed | 1968-05-28 | 1971-04-27 | 8 | Details |
| US3575661A | Remote control tuning circuit | Expired / Lapsed | 1968-11-05 | 1971-04-20 | 3 | Details |
| US3573756A | Associative memory circuitry | Expired / Lapsed | 1968-05-13 | 1971-04-06 | 9 | Details |
| US3573787A | Generator for video signal for reproduction of characters b… | Expired / Lapsed | 1968-01-31 | 1971-04-06 | 12 | Details |
| US3571519A | Synchronous supervisory unit for mobile telephone system | Expired / Lapsed | 1968-10-31 | 1971-03-16 | 11 | Details |
| US3566307A | Unijunction transistor time delay circuit | Expired / Lapsed | 1968-02-09 | 1971-02-23 | 0 | Details |
| US3555294A | Transistor-transistor logic circuits having improved voltag… | Expired / Lapsed | 1967-02-28 | 1971-01-12 | 9 | Details |
| US3553585A | Locking and latching mechanism for members of communication… | Expired / Lapsed | 1968-12-05 | 1971-01-05 | 0 | Details |
| US3544803A | Vehicular electrical systems | Expired / Lapsed | 1968-04-01 | 1970-12-01 | 0 | Details |
| US3544904A | Receiver noise cancellation system | Expired / Lapsed | 1967-09-07 | 1970-12-01 | 0 | Details |
| US3541353A | Mosfet digital gate | Expired / Lapsed | 1967-09-13 | 1970-11-17 | 0 | Details |
| US3538449A | Lateral pnp-npn composite monolithic differential amplifier | Expired / Lapsed | 1968-11-22 | 1970-11-03 | 0 | Details |
| US3532988A | Digital troposcatter multiplex communication system optimum… | Expired / Lapsed | 1969-01-23 | 1970-10-06 | 0 | Details |
| US3531655A | Electrical signal comparator | Expired / Lapsed | 1968-02-02 | 1970-09-29 | 0 | Details |
| US3530467A | Dual-mode range acquisition system | Expired / Lapsed | 1968-09-30 | 1970-09-22 | 0 | Details |
| US3527999A | Switching type voltage regulator controlled by integrating … | Expired / Lapsed | 1968-03-01 | 1970-09-08 | 0 | Details |
| US3523230A | Stepping motor positioning systems | Expired / Lapsed | 1968-11-08 | 1970-08-04 | 0 | Details |
| US3518552A | Multi-frequency signal generation | Expired / Lapsed | 1968-03-27 | 1970-06-30 | 0 | Details |
| US3510780A | Two-state communication devices having combined clock and i… | Expired / Lapsed | 1966-09-12 | 1970-05-05 | 0 | Details |
| US3510776A | Fm tone signal receiving circuit | Expired / Lapsed | 1966-02-16 | 1970-05-05 | 0 | Details |
| US3500458A | Transmission time limited transmitter | Expired / Lapsed | 1966-08-31 | 1970-03-10 | 0 | Details |
| US3497813A | Multi-frequency receiver with automatic channel selection a… | Expired / Lapsed | 1967-08-21 | 1970-02-24 | 0 | Details |
| US3496467A | Automatic tone coded squelch circuit for radio communicatio… | Expired / Lapsed | 1967-10-13 | 1970-02-17 | 0 | Details |
| US3482166A | Multi-frequency receiver with automatic monitoring of chann… | Expired / Lapsed | 1967-05-29 | 1969-12-02 | 0 | Details |
| US3482173A | Wave signal phase and amplitude detector | Expired / Lapsed | 1966-07-05 | 1969-12-02 | 0 | Details |
| US3470479A | Method and system for detecting tone signal by mixing with … | Expired / Lapsed | 1966-01-12 | 1969-09-30 | 0 | Details |
| US3469191A | Transmission time limiting | Expired / Lapsed | 1966-08-31 | 1969-09-23 | 0 | Details |
| US3465254A | Ultrahigh frequency phase shifter | Expired / Lapsed | 1965-11-29 | 1969-09-02 | 0 | Details |
| US3462554A | Transmission system utilizing independent diversity recepti… | Expired / Lapsed | 1966-01-14 | 1969-08-19 | 0 | Details |
| US3461452A | Time delay measurements | Expired / Lapsed | 1966-10-24 | 1969-08-12 | 0 | Details |
| US3458664A | Control unit for mobile radio telephone system | Expired / Lapsed | 1965-10-14 | 1969-07-29 | 0 | Details |
| US3458721A | Quantizing circuit using progressively biased transistors i… | Expired / Lapsed | 1965-05-28 | 1969-07-29 | 0 | Details |
| US3454927A | Remote control system using frequency code patterns transmi… | Expired / Lapsed | 1965-01-25 | 1969-07-08 | 0 | Details |
| US3444440A | Multiple lead semiconductor device with plastic encapsulati… | Expired / Lapsed | 1964-11-27 | 1969-05-13 | 0 | Details |
| US3437849A | Temperature compensation of electrical devices | Expired / Lapsed | 1966-11-21 | 1969-04-08 | 2 | Details |
| US3437934A | Series resonant circuit for coupling output of mixer to inp… | Expired / Lapsed | 1966-01-12 | 1969-04-08 | 0 | Details |
| US3419887A | Character printer utilizing a rope memory | Expired / Lapsed | 1965-09-07 | 1968-12-31 | 2 | Details |
| US3414721A | Multiplier-divider including a bridge circuit | Expired / Lapsed | 1965-08-17 | 1968-12-03 | 0 | Details |
| US3413713A | Plastic encapsulated transistor and method of making same | Expired / Lapsed | 1965-06-18 | 1968-12-03 | 0 | Details |
| US3409102A | Speed control system | Expired / Lapsed | 1966-05-05 | 1968-11-05 | 0 | Details |
| US3407479A | Isolation of semiconductor devices | Expired / Lapsed | 1965-06-28 | 1968-10-29 | 0 | Details |
| US3408626A | Control system with variable length messages and plural dec… | Expired / Lapsed | 1964-07-16 | 1968-10-29 | 0 | Details |
| US3400378A | Data acquisition system with plural scanners at plural remo… | Expired / Lapsed | 1965-10-22 | 1968-09-03 | 0 | Details |
| US3400219A | Remote station apparatus for remote control system via tele… | Expired / Lapsed | 1965-06-23 | 1968-09-03 | 0 | Details |
| US3397349A | High voltage semiconductor rectifier with a sloping surface… | Expired / Lapsed | 1964-12-22 | 1968-08-13 | 0 | Details |
| US3394037A | Method of making a semiconductor device by masking and diff… | Expired / Lapsed | 1965-05-28 | 1968-07-23 | 0 | Details |
| US3394349A | Supervisory control system having repeat message control an… | Expired / Lapsed | 1965-03-22 | 1968-07-23 | 2 | Details |
| US3383690A | Bearing measurement system | Expired / Lapsed | 1967-02-21 | 1968-05-14 | 0 | Details |
| US3358230A | Electronic device | Expired / Lapsed | 1965-03-05 | 1967-12-12 | 1 | Details |
| US3358195A | Remote cutoff field effect transistor | Expired / Lapsed | 1964-07-24 | 1967-12-12 | 2 | Details |
| US3355709A | Code receiver responsive to plural tones in sequence | Expired / Lapsed | 1965-01-14 | 1967-11-28 | 2 | Details |
| US3351859A | Communication system employing multipath rejection means | Expired / Lapsed | 1964-08-19 | 1967-11-07 | 2 | Details |
| US3351846A | Constant power generator | Expired / Lapsed | 1964-01-15 | 1967-11-07 | 1 | Details |
| US3350687A | Control system with time reference for data acquisition | Expired / Lapsed | 1963-08-05 | 1967-10-31 | 2 | Details |
| US3349374A | Supervisory control system with message traffic control | Expired / Lapsed | 1963-08-05 | 1967-10-24 | 2 | Details |
| US3345568A | Transistorized portable radio transmitter-receiver structure | Expired / Lapsed | 1964-01-13 | 1967-10-03 | 2 | Details |
| US3345221A | Method of making a semiconductor device having improved pn … | Expired / Lapsed | 1963-04-10 | 1967-10-03 | 2 | Details |
| US3343002A | Integrated solid state scanning device | Expired / Lapsed | 1963-11-29 | 1967-09-19 | 2 | Details |
| US3339204A | Electronic system | Expired / Lapsed | 1965-03-19 | 1967-08-29 | 2 | Details |
| US3336533A | Electronic circuit | Expired / Lapsed | 1964-03-13 | 1967-08-15 | 2 | Details |
| US3328695A | Receiver muting system for two-way radio communication equi… | Expired / Lapsed | 1964-05-05 | 1967-06-27 | 2 | Details |
| US3327217A | Tone signaling automatic remote control system | Expired / Lapsed | 1965-03-02 | 1967-06-20 | 1 | Details |
| US3323022A | Package for discrete and integrated circuit components | Expired / Lapsed | 1965-08-23 | 1967-05-30 | 1 | Details |
| US3320770A | Mechanical device for an engine ignition timer | Expired / Lapsed | 1965-07-12 | 1967-05-23 | 2 | Details |
| US3320552A | Band limited frequency modulation system | Expired / Lapsed | 1964-06-03 | 1967-05-16 | 2 | Details |
| US3309245A | Method for making a semiconductor device | Expired / Lapsed | 1965-06-18 | 1967-03-14 | 2 | Details |
| US3307192A | Navigation system | Expired / Lapsed | 1965-03-26 | 1967-02-28 | 2 | Details |
| US3307047A | Clocked set-reset flip-flop | Expired / Lapsed | 1964-04-30 | 1967-02-28 | 2 | Details |
| US3306768A | Method of forming thin oxide films | Expired / Lapsed | 1964-01-08 | 1967-02-28 | 2 | Details |
| US3307167A | Electrical control circuit including indirectly heated ther… | Expired / Lapsed | 1963-12-06 | 1967-02-28 | 2 | Details |
| US3305779A | Portable electronic device for operation by rechargeable or… | Expired / Lapsed | 1963-10-14 | 1967-02-21 | 1 | Details |
| US3304501A | Time delay circuit for briefly holding a selective call tra… | Expired / Lapsed | 1964-08-20 | 1967-02-14 | 1 | Details |
| US3303413A | Current regulator | Expired / Lapsed | 1963-08-15 | 1967-02-07 | 2 | Details |
| US3303333A | Error detection and correction system for convolutional cod… | Expired / Lapsed | 1962-07-25 | 1967-02-07 | 2 | Details |
| US3301706A | Process of forming an inorganic glass coating on semiconduc… | Expired / Lapsed | 1965-07-07 | 1967-01-31 | 2 | Details |
| US3299291A | Logic elements using field-effect transistors in source fol… | Expired / Lapsed | 1964-02-18 | 1967-01-17 | 2 | Details |
| US3292241A | Method for connecting semiconductor devices | Expired / Lapsed | 1964-05-20 | 1966-12-20 | 0 | Details |
| US3292085A | Combined encoder-decoder device providing rapid build up of… | Expired / Lapsed | 1963-09-18 | 1966-12-13 | 2 | Details |
| US3292086A | System for converting a train of binary zeroes to a train o… | Expired / Lapsed | 1963-07-11 | 1966-12-13 | 2 | Details |
| US3292178A | Communication system | Expired / Lapsed | 1962-03-22 | 1966-12-13 | 2 | Details |
| US3275911A | Semiconductor current limiter | Expired / Lapsed | 1963-11-06 | 1966-09-27 | 2 | Details |
| US3275846A | Integrated circuit bistable multivibrator | Expired / Lapsed | 1963-02-25 | 1966-09-27 | 2 | Details |
| US3275845A | Field switching device employing punchthrough phenomenon | Expired / Lapsed | 1962-12-27 | 1966-09-27 | 2 | Details |
| US3259761A | Integrated circuit logic | Expired / Lapsed | 1964-02-13 | 1966-07-05 | 1 | Details |
| US3256517A | Remote alarm system with scanning by tones | Expired / Lapsed | 1963-07-03 | 1966-06-14 | 2 | Details |
| US3253365A | Self-propelled top | Expired / Lapsed | 1963-07-12 | 1966-05-31 | 2 | Details |
| US3248734A | Electronic triangulation system | Expired / Lapsed | 1963-08-30 | 1966-04-26 | 2 | Details |
| US3243323A | Gas etching | Expired / Lapsed | 1965-09-01 | 1966-03-29 | 2 | Details |
| US3242480A | Combination of n of m tones code generator | Expired / Lapsed | 1963-07-03 | 1966-03-22 | 2 | Details |
| US3233128A | Distributor | Expired / Lapsed | 1963-05-21 | 1966-02-01 | 1 | Details |
| US3233239A | Induction field transmitter | Expired / Lapsed | 1961-07-17 | 1966-02-01 | 2 | Details |
| US3229230A | Suppressed carrier modulator | Expired / Lapsed | 1962-10-19 | 1966-01-11 | 0 | Details |
| US3226613A | High voltage semiconductor device | Expired / Lapsed | 1963-03-18 | 1965-12-28 | 2 | Details |
| US3226611A | Semiconductor device | Expired / Lapsed | 1962-08-23 | 1965-12-28 | 2 | Details |
| US3223904A | Field effect device and method of manufacturing the same | Expired / Lapsed | 1965-03-31 | 1965-12-14 | 1 | Details |
| US3214652A | Transistor comprising prong-shaped emitter electrode | Expired / Lapsed | 1962-03-19 | 1965-10-26 | 2 | Details |
| US3203412A | Ignition system | Expired / Lapsed | 1963-01-07 | 1965-08-31 | 2 | Details |
| US3197880A | Solid state compass | Expired / Lapsed | 1961-06-15 | 1965-08-03 | 2 | Details |
| US3196354A | Signal to noise ratio controlled squelch circuit | Expired / Lapsed | 1962-06-20 | 1965-07-20 | 2 | Details |
| US3191129A | Stabilized signal generator | Expired / Lapsed | 1962-10-19 | 1965-06-22 | 2 | Details |
| US3183130A | Diffusion process and apparatus | Expired / Lapsed | 1962-01-22 | 1965-05-11 | 2 | Details |
| US3176382A | Method for making semiconductor devices | Expired / Lapsed | 1963-02-27 | 1965-04-06 | 2 | Details |
| US3175458A | Optical apparatus for positioning a workpiece | Expired / Lapsed | 1960-02-23 | 1965-03-30 | 2 | Details |
| US3175193A | Traffic signal synchronizing system | Expired / Lapsed | 1960-06-29 | 1965-03-23 | 2 | Details |
| US3175191A | Binary code signalling system having a binary counter at th… | Expired / Lapsed | 1960-01-14 | 1965-03-23 | 2 | Details |
| US3154785A | Television receiver cabinet with pivoted vertical monopole … | Expired / Lapsed | 1963-02-13 | 1964-10-27 | 2 | Details |
| US3149317A | Radio alarm | Expired / Lapsed | 1960-07-13 | 1964-09-15 | 2 | Details |
| US3133251A | Overload protector circuit for radio receivers | Expired / Lapsed | 1961-05-15 | 1964-05-12 | 2 | Details |
| US3131354A | Tone control receiver circuit | Expired / Lapsed | 1961-06-12 | 1964-04-28 | 2 | Details |
| US3101441A | Transistor voltage regulator | Expired / Lapsed | 1958-08-04 | 1963-08-20 | 2 | Details |
| US3090706A | Printed circuit process | Expired / Lapsed | 1959-07-03 | 1963-05-21 | 2 | Details |
| US3087998A | Radio telephone system | Expired / Lapsed | 1958-01-17 | 1963-04-30 | 2 | Details |
| US3087117A | Portable transmitter apparatus with selective, diverse ante… | Expired / Lapsed | 1959-08-03 | 1963-04-23 | 2 | Details |
| US3071728A | Portable auto radio receiver | Expired / Lapsed | 1958-09-02 | 1963-01-01 | 1 | Details |
| US3069617A | Voltage regulated power supply | Expired / Lapsed | 1958-08-01 | 1962-12-18 | 0 | Details |
| US3068467A | Periphery plot converter | Expired / Lapsed | 1958-12-12 | 1962-12-11 | 0 | Details |
| US3060553A | Method for making semiconductor device | Expired / Lapsed | 1962-06-12 | 1962-10-30 | 0 | Details |
| US3052957A | Plated circuit process | Expired / Lapsed | 1957-05-27 | 1962-09-11 | 2 | Details |
| US3048659A | Microphone preamplifier | Expired / Lapsed | 1959-03-30 | 1962-08-07 | 0 | Details |
| US3039081A | Frequency selective signalling system | Expired / Lapsed | 1959-03-12 | 1962-06-12 | 0 | Details |
| US3037114A | Switching circuit | Expired / Lapsed | 1959-10-19 | 1962-05-29 | 0 | Details |
| US3007820A | Decontamination process | Expired / Lapsed | 1960-02-26 | 1961-11-07 | 2 | Details |
| US3002146A | Remote capacitor switching system | Expired / Lapsed | 1958-10-13 | 1961-09-26 | 0 | Details |
| US2996655A | Current limiter for generators | Expired / Lapsed | 1958-08-05 | 1961-08-15 | 0 | Details |
| US2991356A | Radio receiver | Expired / Lapsed | 1959-02-06 | 1961-07-04 | 0 | Details |
| US2972114A | Amplifier circuit | Expired / Lapsed | 1957-12-23 | 1961-02-14 | 0 | Details |
| US2969268A | Cabinet | Expired / Lapsed | 1959-01-08 | 1961-01-24 | 0 | Details |
| US2966585A | Receiving system | Expired / Lapsed | 1957-08-19 | 1960-12-27 | 0 | Details |
| US2961609A | Pulse width discriminator circuit | Expired / Lapsed | 1956-11-05 | 1960-11-22 | 0 | Details |
| US2947925A | Transistor and method of making the same | Expired / Lapsed | 1958-02-21 | 1960-08-02 | 0 | Details |
| US2946936A | Semiconductor device | Expired / Lapsed | 1954-03-05 | 1960-07-26 | 0 | Details |
| US2932736A | Radio receiver circuit | Expired / Lapsed | 1956-10-22 | 1960-04-12 | 0 | Details |
| US2929926A | Radio receiver with automatic gain control operating over w… | Expired / Lapsed | 1957-04-10 | 1960-03-22 | 0 | Details |
| US2915603A | Bias stabilized cascaded transistors | Expired / Lapsed | 1955-01-03 | 1959-12-01 | 0 | Details |
| US2910689A | Transistor horn | Expired / Lapsed | 1957-12-10 | 1959-10-27 | 0 | Details |
| US2905909A | Electromechanical filter | Expired / Lapsed | 1956-04-16 | 1959-09-22 | 0 | Details |
| US2893674A | Stand for television receiver | Expired / Lapsed | 1956-12-28 | 1959-07-07 | 0 | Details |
| US2892930A | Communication system | Expired / Lapsed | 1955-01-10 | 1959-06-30 | 0 | Details |
| US2891146A | Manual volume control for transistor audio stage utilizing … | Expired / Lapsed | 1956-12-07 | 1959-06-16 | 0 | Details |
| US2891156A | Detector circuit | Expired / Lapsed | 1956-07-25 | 1959-06-16 | 0 | Details |
| US2887574A | Transistor oscillator | Expired / Lapsed | 1956-12-28 | 1959-05-19 | 0 | Details |
| US2884485A | Television receiver | Expired / Lapsed | 1955-03-08 | 1959-04-28 | 0 | Details |
| US2873369A | Television synchronization | Expired / Lapsed | 1955-05-12 | 1959-02-10 | 0 | Details |
| US2864943A | Central station interrogation via relays of unattended data… | Expired / Lapsed | 1954-02-24 | 1958-12-16 | 0 | Details |
| US2859346A | Crystal oscillator | Expired / Lapsed | 1954-07-28 | 1958-11-04 | 0 | Details |
| US2852730A | Power supply | Expired / Lapsed | 1955-09-23 | 1958-09-16 | 0 | Details |
| US2850413A | Process for making fused junction semiconductor devices | Expired / Lapsed | 1954-09-29 | 1958-09-02 | 2 | Details |
| US2844711A | Multiple frequency channel multiplex communication system | Expired / Lapsed | 1953-06-08 | 1958-07-22 | 0 | Details |
| US2834879A | Frequency selective system | Expired / Lapsed | 1952-01-23 | 1958-05-13 | 0 | Details |
| US2811643A | Transistor oscillator | Expired / Lapsed | 1955-01-03 | 1957-10-29 | 0 | Details |
| US2811590A | Series-energized cascade transistor amplifier | Expired / Lapsed | 1953-03-02 | 1957-10-29 | 0 | Details |
| US2810071A | Radio receiver | Expired / Lapsed | 1956-09-11 | 1957-10-15 | 0 | Details |
| US2810068A | Portable electronic unit | Expired / Lapsed | 1953-02-24 | 1957-10-15 | 0 | Details |
| US2808507A | Receiver circuit | Expired / Lapsed | 1953-05-22 | 1957-10-01 | 0 | Details |
| US2790141A | Semiconductor measuring system | Expired / Lapsed | 1953-08-05 | 1957-04-23 | 0 | Details |
| US2787695A | Snow detector | Expired / Lapsed | 1954-05-06 | 1957-04-02 | 0 | Details |
| US2782405A | Apparatus for detecting motion in a bconfined space | Expired / Lapsed | 1954-05-27 | 1957-02-19 | 0 | Details |
| US2782406A | Pilot light switch | Expired / Lapsed | 1953-12-02 | 1957-02-19 | 0 | Details |
| US2779903A | Semi-conductor unit | Expired / Lapsed | 1953-04-30 | 1957-01-29 | 0 | Details |
| US2770721A | Squelch circuit | Expired / Lapsed | 1952-05-03 | 1956-11-13 | 0 | Details |
| US2767397A | Antenna | Expired / Lapsed | 1951-03-31 | 1956-10-16 | 0 | Details |
| US2766321A | Color demodulator output controlled subcarrier oscillator | Expired / Lapsed | 1952-12-06 | 1956-10-09 | 0 | Details |
| US2766324A | Switching system | Expired / Lapsed | 1951-12-18 | 1956-10-09 | 0 | Details |
| US2759052A | Amplifier semi-conductor volume compression system | Expired / Lapsed | 1953-09-21 | 1956-08-14 | 0 | Details |
| US2756414A | Coupling unit | Expired / Lapsed | 1952-03-01 | 1956-07-24 | 0 | Details |
| US2743433A | Pilot lamp approach control system | Expired / Lapsed | 1954-01-07 | 1956-04-24 | 0 | Details |
| US2743361A | Selective squelch receiver | Expired / Lapsed | 1952-01-23 | 1956-04-24 | 0 | Details |
| US2731635A | Priority control apparatus for a communication system | Expired / Lapsed | 1954-08-09 | 1956-01-17 | 0 | Details |
| US2728693A | Method of forming electrical conductor upon an insulating b… | Expired / Lapsed | 1953-08-24 | 1955-12-27 | 2 | Details |
| US2718623A | Tuner | Expired / Lapsed | 1951-08-30 | 1955-09-20 | 0 | Details |
| US2699425A | Electroplating electrical conductors on an insulating panel | Expired / Lapsed | 1952-07-05 | 1955-01-11 | 2 | Details |
| US2699496A | Microwave relay test system | Expired / Lapsed | 1952-04-03 | 1955-01-11 | 0 | Details |
| US2699495A | Automatic switchover system for radio relay | Expired / Lapsed | 1950-10-03 | 1955-01-11 | 0 | Details |
| US2699424A | Electroplating process for producing printed circuits | Expired / Lapsed | 1949-10-07 | 1955-01-11 | 2 | Details |
| US2696574A | Transistor unit | Expired / Lapsed | 1953-06-05 | 1954-12-07 | 0 | Details |
| US2696575A | Transistor unit | Expired / Lapsed | 1953-06-05 | 1954-12-07 | 0 | Details |
| US2689882A | Telephone terminal equipment | Expired / Lapsed | 1949-11-17 | 1954-09-21 | 0 | Details |
| US2688086A | Television tuner | Expired / Lapsed | 1948-07-10 | 1954-08-31 | 0 | Details |
| US2664554A | Remote-control and supervisory control system | Expired / Lapsed | 1951-04-19 | 1953-12-29 | 0 | Details |
| US2654834A | Transmit-receive switch | Expired / Lapsed | 1949-11-01 | 1953-10-06 | 0 | Details |
| US2653226A | Automatic gain control system | Expired / Lapsed | 1949-08-20 | 1953-09-22 | 0 | Details |
| US2652542A | Electromechanical filter | Expired / Lapsed | 1948-12-14 | 1953-09-15 | 0 | Details |
| US2645717A | Synchronization circuit | Expired / Lapsed | 1951-08-18 | 1953-07-14 | 0 | Details |
| US2637782A | Resonant cavity filter | Expired / Lapsed | 1947-11-28 | 1953-05-05 | 0 | Details |
| US2623942A | Color control for television systems | Expired / Lapsed | 1947-11-03 | 1952-12-30 | 0 | Details |
| US2611106A | Television sweep system | Expired / Lapsed | 1949-07-20 | 1952-09-16 | 0 | Details |
| US2607818A | Thermostatically controlled crystal unit | Expired / Lapsed | 1949-02-17 | 1952-08-19 | 0 | Details |
| US2597517A | Bus progress control system | Expired / Lapsed | 1948-06-05 | 1952-05-20 | 0 | Details |
| US2593479A | Electrical apparatus using metalized circuits and component… | Expired / Lapsed | 1948-07-07 | 1952-04-22 | 0 | Details |
| US2585640A | Radio control system | Expired / Lapsed | 1945-07-23 | 1952-02-12 | 0 | Details |
| US2584332A | Video amplifier having variable gain and variable band width | Expired / Lapsed | 1949-08-19 | 1952-02-05 | 0 | Details |
| US2584120A | Tuner | Expired / Lapsed | 1948-12-20 | 1952-02-05 | 0 | Details |
| US2581967A | Simplified chassis for electronic equipment | Expired / Lapsed | 1947-04-11 | 1952-01-08 | 0 | Details |
| US2572900A | Audio compression system | Expired / Lapsed | 1948-03-22 | 1951-10-30 | 0 | Details |
| US2566767A | Selecting device | Expired / Lapsed | 1946-05-01 | 1951-09-04 | 0 | Details |
| US2566762A | Reactance tube control for sawtooth generators | Expired / Lapsed | 1946-04-26 | 1951-09-04 | 0 | Details |
| US2560320A | Radio transmitter-receiver, including shielding chassis and… | Expired / Lapsed | 1948-06-16 | 1951-07-10 | 0 | Details |
| US2547024A | Selective calling system | Expired / Lapsed | 1947-07-02 | 1951-04-03 | 0 | Details |
| US2533493A | Portable radio device | Expired / Lapsed | 1946-05-31 | 1950-12-12 | 0 | Details |
| US2520985A | Antenna coupling circuit | Expired / Lapsed | 1947-10-22 | 1950-09-05 | 0 | Details |
| US2514285A | Coded range-signal responsive system | Expired / Lapsed | 1944-07-24 | 1950-07-04 | 0 | Details |
| US2502832A | Indicating and carrying means for portable radio receiving … | Expired / Lapsed | 1945-01-22 | 1950-04-04 | 0 | Details |
| US2492236A | Wiring arrangement | Expired / Lapsed | 1946-07-22 | 1949-12-27 | 0 | Details |
| US2492235A | Wave-signal translating apparatus chassis | Expired / Lapsed | 1945-05-30 | 1949-12-27 | 0 | Details |
| US2468550A | Method of and apparatus for cleaning by ultrasonic waves | Expired / Lapsed | 1944-10-27 | 1949-04-26 | 0 | Details |
| US2458365A | Television receiver | Expired / Lapsed | 1946-09-11 | 1949-01-04 | 0 | Details |
| US2439412A | Multistage plug-in frequency-determining unit | Expired / Lapsed | 1944-08-04 | 1948-04-13 | 0 | Details |
| US2430990A | Coupling transformer for radiofrequency selectors | Expired / Lapsed | 1944-07-01 | 1947-11-18 | 0 | Details |
| US2427674A | Aircraft heating apparatus with altitude responsive combust… | Expired / Lapsed | 1944-06-29 | 1947-09-23 | 0 | Details |
| US2420609A | Translating circuit and apparatus for portable electrical d… | Expired / Lapsed | 1943-04-19 | 1947-05-13 | 0 | Details |
| US2409139A | Radio receiving system | Expired / Lapsed | 1943-07-03 | 1946-10-08 | 0 | Details |
| US2328805A | Valve mechanism | Expired / Lapsed | 1941-06-13 | 1943-09-07 | 0 | Details |
| US2293703A | Record changer | Expired / Lapsed | 1940-05-10 | 1942-08-25 | 0 | Details |
| US2206820A | Antenna system | Expired / Lapsed | 1938-12-07 | 1940-07-02 | 0 | Details |
| US2047153A | Automobile radio receiver | Expired / Lapsed | 1933-03-22 | 1936-07-07 | 0 | Details |
| US2004918A | Control device | Expired / Lapsed | 1932-11-10 | 1935-06-11 | 0 | Details |