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Class Information
Number: 455/227
Name: Telecommunications > Receiver or analog modulated signal frequency converter > Responsive to an input signal of particular predetermined frequency
Description: Subject matter wherein the receiver is permanently adjusted in such a manner as to have a response to signals having a carrier wave of a predetermined frequency or a carrier signal having a predetermined identifying modulation frequency superimposed thereon.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5781852 |
Alert receiver interface |
Jul. 14, 1998 |
| 5781145 |
Motorcycle mounted radar/laser speed detection countermeasure device |
Jul. 14, 1998 |
| 5710975 |
Selective call transceiver with system approved power saving state |
Jan. 20, 1998 |
| 5461383 |
Wideband microwave detector |
Oct. 24, 1995 |
| 5457818 |
Detection threshold adjustment method for linear matched filter receivers |
Oct. 10, 1995 |
| 5426670 |
Interference compensating circuit including a matched filter followed by a median filter |
Jun. 20, 1995 |
| 5270706 |
Passive aircraft proximity detector for use in highway vehicles |
Dec. 14, 1993 |
| 5163163 |
Diversity reception control circuit |
Nov. 10, 1992 |
| 5001777 |
Police radar detector |
Mar. 19, 1991 |
| 4928100 |
Paging receiver for receiving pages from analog or digital paging transmitters |
May. 22, 1990 |
| 4887086 |
Combination scanner and radar detector |
Dec. 12, 1989 |
| 4801938 |
Remote output indicator for providing output indications from a remotely located radar detector which is adapted to be used in connection with a brake light indicator |
Jan. 31, 1989 |
| 4719462 |
Radar detection helmet |
Jan. 12, 1988 |
| 4700191 |
Radar warning receiver |
Oct. 13, 1987 |
| 4631542 |
Police radar warning receiver with mute function |
Dec. 23, 1986 |
| 4630054 |
Radar detection and signal processing circuit |
Dec. 16, 1986 |
| 4556864 |
Apparatus and method for communicating digital information on AC power lines |
Dec. 3, 1985 |
| 4430758 |
Suspended-substrate co-planar stripline mixer |
Feb. 7, 1984 |
| 4419765 |
Signal absence detector |
Dec. 6, 1983 |
| 4389639 |
Voice warning device using entertainment speaker |
Jun. 21, 1983 |
| 4385398 |
Selective call communication receiver |
May. 24, 1983 |
| 4368539 |
Transmitter detector |
Jan. 11, 1983 |
| 4334319 |
Battery-powered receivers |
Jun. 8, 1982 |
| 4334320 |
Traffic information radio signal receiver |
Jun. 8, 1982 |
| 4315261 |
Radar signal detector |
Feb. 9, 1982 |
| 4238778 |
System for warning the approach of an emergency vehicle |
Dec. 9, 1980 |
| 4219777 |
Detector for multiplicity of radio wave frequencies |
Aug. 26, 1980 |
| 4191925 |
Power line protection circuit |
Mar. 4, 1980 |
| 4158148 |
Latching detector circuit |
Jun. 12, 1979 |
| 4151472 |
Selective calling circuit employing controlled power supply therefor |
Apr. 24, 1979 |
| 4079317 |
Safeguard sentry |
Mar. 14, 1978 |
| 4039957 |
Signal activated emergency alarm device |
Aug. 2, 1977 |
| 3949401 |
Frequency identification circuit for broadcast traffic information reception systems |
Apr. 6, 1976 |
| 3938077 |
Alarm device for continually indicating the state of air pressure in a plurality of tires |
Feb. 10, 1976 |
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