Motorola Solutions Inc
Motorola SActive Patents
0
Total Holdings
223
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| WO1987001490A1 | Radiotelephone system employing digitized speech/data and e… | Expired / Lapsed | 1986-07-11 | — | 0 | Details |
| US6030392A | Connector for hollow anatomical structures and methods of u… | Expired / Lapsed | 1997-05-19 | 2000-02-29 | 28 | Details |
| US5180951A | Electron device electron source including a polycrystalline… | Expired / Lapsed | 1992-02-05 | 1993-01-19 | 26 | Details |
| US5141460A | Method of making a field emission electron source employing… | Expired / Lapsed | 1991-08-20 | 1992-08-25 | 20 | Details |
| US5047762A | Method and apparatus for increasing co-channel utilization … | Expired / Lapsed | 1989-12-06 | 1991-09-10 | 28 | Details |
| US4893351A | Communication receiver having a remote alert device | Expired / Lapsed | 1987-09-02 | 1990-01-09 | 24 | 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 |
| 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 |
| US4737978A | Networked cellular radiotelephone systems | Expired / Lapsed | 1986-10-31 | 1988-04-12 | 17 | Details |
| US4701883A | ECL/CMOS memory cell with separate read and write bit lines | Expired / Lapsed | 1986-06-19 | 1987-10-20 | 19 | Details |
| US4654867A | Cellular voice and data radiotelephone system | Expired / Lapsed | 1986-08-11 | 1987-03-31 | 72 | Details |
| US4584709A | Homotropic antenna system for portable radio | Expired / Lapsed | 1983-07-06 | 1986-04-22 | 19 | Details |
| US4550443A | Method and apparatus for dynamically selecting transmitters… | Expired / Lapsed | 1984-09-24 | 1985-10-29 | 4 | 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 |
| US4479245A | Same frequency repeater for a multiple repeater system | Expired / Lapsed | 1982-12-21 | 1984-10-23 | 12 | 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 |
| US4400664A | Digital phase detector | Expired / Lapsed | 1981-05-26 | 1983-08-23 | 7 | 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 |
| 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 |
| US4237547A | Program decoder for shared contact eprom | Expired / Lapsed | 1979-09-17 | 1980-12-02 | 11 | Details |
| US4234924A | Method of introducing a baseline measurement into electroni… | Expired / Lapsed | 1978-09-11 | 1980-11-18 | 6 | 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 |
| US4224537A | Modified semiconductor temperature sensor | Expired / Lapsed | 1978-11-16 | 1980-09-23 | 8 | Details |
| US4201960A | Method for automatically matching a radio frequency transmi… | Expired / Lapsed | 1978-05-24 | 1980-05-06 | 35 | Details |
| US4190849A | Electronic-beam programmable semiconductor device structure | Expired / Lapsed | 1977-09-19 | 1980-02-26 | 2 | Details |
| US4181893A | Battery saver for a tone coded signalling system | Expired / Lapsed | 1976-12-30 | 1980-01-01 | 41 | Details |
| US4161662A | Standardized digital logic chip | Expired / Lapsed | 1977-11-07 | 1979-07-17 | 4 | Details |
| US4140060A | Subcarrier modulated optical transceiver | Expired / Lapsed | 1975-05-19 | 1979-02-20 | 17 | Details |
| US4128740A | Antenna array for a cellular RF communications system | Expired / Lapsed | 1977-02-14 | 1978-12-05 | 15 | Details |
| US4101836A | Sectored antenna receiving system | Expired / Lapsed | 1977-05-02 | 1978-07-18 | 26 | 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 |
| US4053739A | Dual modulus programmable counter | Expired / Lapsed | 1976-08-11 | 1977-10-11 | 8 | Details |
| US4045796A | Correlation system for pseudo-random noise signals | Expired / Lapsed | 1976-11-12 | 1977-08-30 | 21 | Details |
| US4037158A | Two-way FM radio system operating on a single channel and p… | Expired / Lapsed | 1976-03-31 | 1977-07-19 | 14 | Details |
| US4032204A | Adjustable mounting arrangement for electronic apparatus | Expired / Lapsed | 1976-06-21 | 1977-06-28 | 10 | Details |
| US4028560A | Contact bounce transient pulse circuit eliminator | Expired / Lapsed | 1975-10-08 | 1977-06-07 | 6 | Details |
| US4010355A | Semiconductor wafer having machine readable indicies | Expired / Lapsed | 1974-06-10 | 1977-03-01 | 18 | 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 |
| US3990078A | Image element antenna array for a monopulse tracking system… | Expired / Lapsed | 1975-01-06 | 1976-11-02 | 8 | Details |
| US3986174A | Communication switching system | Expired / Lapsed | 1974-05-02 | 1976-10-12 | 14 | 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 |
| US3975712A | Asynchronous communication interface adaptor | Expired / Lapsed | 1975-02-18 | 1976-08-17 | 23 | 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 |
| US3942162A | Pre-conditioning circuits for MOS integrated circuits | Expired / Lapsed | 1974-07-01 | 1976-03-02 | 13 | Details |
| US3924079A | Latching multiplexer circuit | Expired / Lapsed | 1974-01-02 | 1975-12-02 | 9 | Details |
| US3922647A | External exclusive OR type circuit for inverting cell MOS R… | Expired / Lapsed | 1974-06-03 | 1975-11-25 | 10 | 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 |
| US3886554A | Method and apparatus for improving the accuracy of a vehicl… | Expired / Lapsed | 1973-04-23 | 1975-05-27 | 19 | Details |
| US3858150A | Polycrystalline silicon pressure sensor | Expired / Lapsed | 1973-06-21 | 1974-12-31 | 2 | 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 |
| US3750032A | Priority channel scanning system with dual response time co… | Expired / Lapsed | 1972-02-24 | 1973-07-31 | 28 | Details |
| US3743850A | Integrated current supply circuit | Expired / Lapsed | 1972-06-12 | 1973-07-03 | 6 | Details |
| US3735240A | Integrated circuit current regulator with differential ampl… | Expired / Lapsed | 1971-10-15 | 1973-05-22 | 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 |
| US3719833A | Technique for compensating for input bias currents of trans… | Expired / Lapsed | 1970-10-12 | 1973-03-06 | 13 | Details |
| US3718899A | Vehicle monitoring system including automatic preselection … | Expired / Lapsed | 1971-04-05 | 1973-02-27 | 0 | 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 |
| 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 |
| US3679963A | Neutron radiation and gamma ray hardened adjustable power s… | Expired / Lapsed | 1970-01-30 | 1972-07-25 | 7 | Details |
| US3676801A | Stabilized complementary micro-power square wave oscillator | Expired / Lapsed | 1970-10-28 | 1972-07-11 | 13 | 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 |
| 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 |
| US3577080A | Remote control system for operation over same audiochannel … | Expired / Lapsed | 1968-12-20 | 1971-05-04 | 21 | Details |
| US3573787A | Generator for video signal for reproduction of characters b… | Expired / Lapsed | 1968-01-31 | 1971-04-06 | 12 | Details |
| US3566307A | Unijunction transistor time delay circuit | Expired / Lapsed | 1968-02-09 | 1971-02-23 | 0 | 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| US3437934A | Series resonant circuit for coupling output of mixer to inp… | Expired / Lapsed | 1966-01-12 | 1969-04-08 | 0 | 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 |
| 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 |
| US3394349A | Supervisory control system having repeat message control an… | Expired / Lapsed | 1965-03-22 | 1968-07-23 | 2 | Details |
| US3358230A | Electronic device | Expired / Lapsed | 1965-03-05 | 1967-12-12 | 1 | 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 |
| 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 |
| US3343002A | Integrated solid state scanning device | Expired / Lapsed | 1963-11-29 | 1967-09-19 | 2 | Details |
| US3336533A | Electronic circuit | Expired / Lapsed | 1964-03-13 | 1967-08-15 | 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 |
| 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 |
| US3307047A | Clocked set-reset flip-flop | Expired / Lapsed | 1964-04-30 | 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 |
| US3299291A | Logic elements using field-effect transistors in source fol… | Expired / Lapsed | 1964-02-18 | 1967-01-17 | 2 | Details |
| US3292178A | Communication system | Expired / Lapsed | 1962-03-22 | 1966-12-13 | 2 | Details |
| US3256517A | Remote alarm system with scanning by tones | Expired / Lapsed | 1963-07-03 | 1966-06-14 | 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| US3069617A | Voltage regulated power supply | Expired / Lapsed | 1958-08-01 | 1962-12-18 | 0 | Details |
| US3060553A | Method for making semiconductor device | Expired / Lapsed | 1962-06-12 | 1962-10-30 | 0 | 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 |
| US3002146A | Remote capacitor switching system | Expired / Lapsed | 1958-10-13 | 1961-09-26 | 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 |
| US2915603A | Bias stabilized cascaded transistors | Expired / Lapsed | 1955-01-03 | 1959-12-01 | 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 |
| US2884485A | Television receiver | Expired / Lapsed | 1955-03-08 | 1959-04-28 | 0 | Details |
| US2864943A | Central station interrogation via relays of unattended data… | Expired / Lapsed | 1954-02-24 | 1958-12-16 | 0 | Details |
| US2859338A | Squelch system for frequency modulation receiver | Expired / Lapsed | 1954-06-01 | 1958-11-04 | 0 | Details |
| US2844711A | Multiple frequency channel multiplex communication system | Expired / Lapsed | 1953-06-08 | 1958-07-22 | 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 |
| 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 |
| US2728693A | Method of forming electrical conductor upon an insulating b… | Expired / Lapsed | 1953-08-24 | 1955-12-27 | 2 | 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 |
| US2696575A | Transistor unit | Expired / Lapsed | 1953-06-05 | 1954-12-07 | 0 | Details |
| US2696574A | Transistor unit | Expired / Lapsed | 1953-06-05 | 1954-12-07 | 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 |
| 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 |
| US2607847A | Vertical retrace blanking | Expired / Lapsed | 1949-11-08 | 1952-08-19 | 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 |
| 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 |
| US2566759A | High-frequency tuner | Expired / Lapsed | 1948-08-03 | 1951-09-04 | 0 | Details |
| US2566762A | Reactance tube control for sawtooth generators | Expired / Lapsed | 1946-04-26 | 1951-09-04 | 0 | Details |
| US2547027A | Vibrating reed controlled oscillator | Expired / Lapsed | 1948-01-02 | 1951-04-03 | 0 | Details |
| US2547024A | Selective calling system | Expired / Lapsed | 1947-07-02 | 1951-04-03 | 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 |
| 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 |
| US2409139A | Radio receiving system | Expired / Lapsed | 1943-07-03 | 1946-10-08 | 0 | Details |
| US2047153A | Automobile radio receiver | Expired / Lapsed | 1933-03-22 | 1936-07-07 | 0 | Details |