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| Patent ID | Title | Date Filed |
| 4862513 | Radio receiver with two different traffic information decoders
| March 1, 1988 |
| 4862175 | Police radar signal band discrimination circuitry for a police radar warning receiver
| February 29, 1988 |
| 4829588 | Automatic retransmission with pilot tone
| August 25, 1981 |
| 4805231 | Apparatus for detecting an electronic surveillance device
| April 1, 1987 |
| 4802240 | Synchronous receiving method for selective calling signal
| July 1, 1987 |
| 4794394 | Emergency vehicle proximity warning system
| September 8, 1987 |
| 4709407 | Band discriminating method in a receiver
| October 1, 1985 |
| 4686707 | Program identifier signal receiver
| May 29, 1985 |
| 4683459 | Alarm system test annunciator
| May 28, 1985 |
| 4633517 | Circuit for decoding traffic information message tone signals
| May 21, 1985 |
| 4633515 | Emergency broadcast alert detector
| April 9, 1984 |
| 4561115 | Decoder for traffic information regional tone signals
| March 8, 1984 |
| 4541118 | SSB System with pilot coded squelch
| December 22, 1983 |
| 4523332 | Battery saver circuit for use with paging receiver
| April 11, 1983 |
| 4506386 | Battery saver for a paging receiver or the like _
| May 24, 1983 |
| 4499603 | Radio receiver with reception-readiness monitoring feature and method
| March 23, 1983 |
| 4480253 | Wrist watch weather radio
| June 1, 1983 |
| 4479261 | Battery saving circuit for paging receiver
| April 18, 1983 |
| 4479125 | Radio paging receiver capable of muting battery saving function
| June 30, 1982 |
| 4476581 | FM Receiver with subcarrier decoding circuit
| September 7, 1982 |
| 4476573 | Radio link remote control signaling system, and method
| October 21, 1982 |
| 4476488 | Control circuit for CATV alert system
| March 23, 1983 |
| 4450589 | FM Receiver for reception of special announcements and general programs
| November 9, 1981 |
| 4449249 | Televison programming information system
| September 27, 1982 |
| 4449248 | Battery saving radio circuit and system
| February 1, 1982 |
| 4438429 | Emergency signal transceiver for disabled car
| October 5, 1981 |
| 4435845 | Automobile radio and tape cassette switching apparatus
| June 29, 1982 |
| 4435843 | FM Receiver for general programs and special announcements
| November 9, 1981 |
| 4422178 | Radio communication receiver having an oscillator circuit of lower power-consumption
| January 4, 1982 |
| 4403208 | Warning-signal-producing system for a motor vehicle responsive to a vehicle-presence-indicating radio wave signal emitted by another vehicle and indicative of its presence
| April 13, 1979 |
| 4399556 | Device for locating audio surveillance apparatus
| March 12, 1982 |
| 4392248 | Attention signal receiver for emergency broadcast systems
| October 5, 1981 |
| 4392135 | Paging receivers
| September 29, 1980 |
| 4360808 | Radio control apparatus with voice transmission capability
| January 25, 1980 |
| 4353065 | Digital radio paging communication system
| March 5, 1981 |
| 4340973 | Selective calling receiver including a voltage converter with low power consumption
| September 26, 1980 |
| 4302817 | Digital Pseudo continuous tone detector
| February 14, 1980 |
| 4280223 | Radar detector
| September 13, 1979 |
| 4264978 | Device for locating audio surveillance apparatus
| October 15, 1979 |
| 4233685 | Radio for receiving and reproducing information broadcast on the intermediate frequency
| November 23, 1979 |
| 4127852 | Power use alarm
| April 28, 1977 |
| 4127817 | Transmitter detecting apparatus
| June 17, 1976 |
| 4104637 | VOR phase monitoring system
| October 27, 1976 |
| 4103235 | Two-tone attention signal broadcasting system
| August 4, 1976 |
| 4079317 | Safeguard sentry
| May 20, 1975 |
| 4068177 | Electronic control circuit
| November 17, 1975 |
| 4039957 | Signal activated emergency alarm device
| March 8, 1976 |
| 4024475 | Decoder for frequency-modulated tones of two different lengths
| May 14, 1976 |
| 4017748 | Monolithic AC level detector
| December 29, 1975 |
| 3975688 | Television shut-off device
| October 21, 1971 |
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