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Class Information
Number: 455/229
Name: Telecommunications > Receiver or analog modulated signal frequency converter > Responsive to an input signal of particular predetermined frequency > Responsive to carrier absence or presence
Description: Subject matter including means for indicating the absence or presence of the carrier in a receiver.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7383051 |
Estimating the location of a mobile unit based on the elimination of improbable locations |
Jun. 3, 2008 |
| 7231194 |
Localization of narrowband signals |
Jun. 12, 2007 |
| 7106188 |
Method and system for providing an activation signal based on a received RF signal |
Sep. 12, 2006 |
| 7010269 |
Pre-equalizer structure based on PN511 sequence for terrestrial DTV reception |
Mar. 7, 2006 |
| 6944465 |
Estimating the location of a mobile unit based on the elimination of improbable locations |
Sep. 13, 2005 |
| 6608999 |
Communication signal receiver and an operating method therefor |
Aug. 19, 2003 |
| 6415139 |
Detection circuit of tone signal |
Jul. 2, 2002 |
| 6353462 |
Television signal and FM broadcast signal demodulator and television signal and FM broadcast signal receiver |
Mar. 5, 2002 |
| 6219540 |
Communication device providing out-of-range battery saving and method therefor |
Apr. 17, 2001 |
| 6212245 |
Communication apparatus |
Apr. 3, 2001 |
| 6175600 |
System for detecting the presence of a digital signal carrier wave, and a receiver including such a system |
Jan. 16, 2001 |
| 6169511 |
Radar detector |
Jan. 2, 2001 |
| 5999799 |
Auto-finder and distance warning method and apparatus for a remote control input device |
Dec. 7, 1999 |
| 5966656 |
Method and apparatus for displaying signal information in a radio communication device |
Oct. 12, 1999 |
| 5883920 |
Spread spectrum receiving apparatus with battery saving function |
Mar. 16, 1999 |
| 5555451 |
High-quality reception indicating circuit for scanning AM recievers |
Sep. 10, 1996 |
| 5493716 |
Method of operating a radio |
Feb. 20, 1996 |
| 5465405 |
Apparatus and method for detecting signals |
Nov. 7, 1995 |
| 5422681 |
Satellite broadcast receiving apparatus capable of forming co-distributing system |
Jun. 6, 1995 |
| 5355518 |
Receiver with constant battery saving duty cycle |
Oct. 11, 1994 |
| 5283550 |
Shopping cart receiver alarm system |
Feb. 1, 1994 |
| 5223815 |
Portable anti-theft device |
Jun. 29, 1993 |
| 5193216 |
Detecting out of range in response to a loss of signal and a history of approaching out of range prior to the loss of signal |
Mar. 9, 1993 |
| 5181227 |
Receiver having a signal detector and bit synchronizer |
Jan. 19, 1993 |
| 5140702 |
Time based signal detector for operating in a presence search mode and absence search mode during peak times and off peak times |
Aug. 18, 1992 |
| 5086290 |
Mobile perimeter monitoring system |
Feb. 4, 1992 |
| 5079553 |
Long range police radar warning receiver |
Jan. 7, 1992 |
| 5049875 |
Method and apparatus for out of range detection in response to nondetection of predetermined baud rates |
Sep. 17, 1991 |
| 5032835 |
Out of range indication for radio receivers |
Jul. 16, 1991 |
| 4972510 |
Method and apparatus for squelching dependent on detected bond rate to reduce unwanted audible noise on a mixed voice data channel |
Nov. 20, 1990 |
| 4920416 |
Method and apparatus for detecting a desired television signal |
Apr. 24, 1990 |
| 4871997 |
Proximity sensor apparatus |
Oct. 3, 1989 |
| 4851820 |
Paging device having a switch actuated signal strength detector |
Jul. 25, 1989 |
| 4833725 |
Unintentional radio transmission detection system |
May. 23, 1989 |
| 4833452 |
Safety device and method of establishing group communication |
May. 23, 1989 |
| 4792796 |
Electronic alarm apparatus |
Dec. 20, 1988 |
| 4748688 |
Electromagnetic wave receiver |
May. 31, 1988 |
| 4661996 |
Method and apparatus for indicating radio frequency carrier loss in remotely controlled vehicles |
Apr. 28, 1987 |
| 4554508 |
Carrier detection circuit |
Nov. 19, 1985 |
| 4539689 |
Fast learn digital adaptive equalizer |
Sep. 3, 1985 |
| 4479252 |
Device for reduction of the false alarm ratio and monitor receiver comprising such a device of this nature |
Oct. 23, 1984 |
| 4241450 |
Automatic turn-off apparatus for a radio or television receiver |
Dec. 23, 1980 |
| 4222119 |
Multi-purpose radio |
Sep. 9, 1980 |
| 4110743 |
Wireless paging receiver |
Aug. 29, 1978 |
| 4079317 |
Safeguard sentry |
Mar. 14, 1978 |
| 4032723 |
Cordless telephone system |
Jun. 28, 1977 |
| 4021739 |
Distress signal protection system |
May. 3, 1977 |
| 4020421 |
Muting circuit |
Apr. 26, 1977 |
| 3944928 |
Harmonic communication system |
Mar. 16, 1976 |
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