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Class Information
Number: 340/531
Name: Communications: electrical > Condition responsive indicating system > With particular coupling link
Description: Subject matter having specific connecting means between the sensing and indicating means.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6104707 |
Transformer coupler for communication over various lines |
Aug. 15, 2000 |
| 6104294 |
Activity measurement |
Aug. 15, 2000 |
| 6104287 |
Circulator reverse power alarm |
Aug. 15, 2000 |
| 6104286 |
Monitoring alarm systems |
Aug. 15, 2000 |
| 6100791 |
Programmable emergency signalling device and system |
Aug. 8, 2000 |
| 6097289 |
Intelligent speaker controller for a fire alarm system |
Aug. 1, 2000 |
| 6097288 |
Expandable, modular annunciation and intercom system |
Aug. 1, 2000 |
| 6094134 |
Device for the verification of an alarm |
Jul. 25, 2000 |
| 6094140 |
Portable alarm system |
Jul. 25, 2000 |
| 6091331 |
Emergency worker and fireman's dual emergency warning system |
Jul. 18, 2000 |
| 6078258 |
Tag system |
Jun. 20, 2000 |
| 6067346 |
Method and system for providing redundancy in security systems served by a public switched telephone network |
May. 23, 2000 |
| 6064307 |
Method for relating information about an article to a finder of the article |
May. 16, 2000 |
| 6060994 |
Method for controlling united home security system |
May. 9, 2000 |
| 6049272 |
Automated data transmission link to law enforcement and security personnel |
Apr. 11, 2000 |
| 6049273 |
Cordless remote alarm transmission apparatus |
Apr. 11, 2000 |
| 6049296 |
Automatic train serialization with car orientation |
Apr. 11, 2000 |
| 6040773 |
Radio frequency identification tag arranged for magnetically storing tag state information |
Mar. 21, 2000 |
| 6031455 |
Method and apparatus for monitoring environmental conditions in a communication system |
Feb. 29, 2000 |
| 6028513 |
Wireless activation of multiple alarm devices upon triggering of a single device |
Feb. 22, 2000 |
| 6023223 |
Early warning detection and notification network for environmental conditions |
Feb. 8, 2000 |
| 6018292 |
Emergency trunk release apparatus |
Jan. 25, 2000 |
| 6014076 |
Apparatus and method for achieving intrinsic safety using conventional sensors |
Jan. 11, 2000 |
| 6011460 |
Vehicle security system for a vehicle having a data communications bus and related methods |
Jan. 4, 2000 |
| 5999089 |
Alarm system |
Dec. 7, 1999 |
| 5986577 |
Method of determining car position |
Nov. 16, 1999 |
| 5986579 |
Method and apparatus for determining railcar order in a train |
Nov. 16, 1999 |
| 5974367 |
Electronic lock system and use thereof |
Oct. 26, 1999 |
| 5966084 |
Automatic train serialization with car orientation |
Oct. 12, 1999 |
| 5959531 |
Optical interface between receiver and tag response signal analyzer in RFID system for detecting low power resonant tags |
Sep. 28, 1999 |
| 5959528 |
Auto synchronous output module and system |
Sep. 28, 1999 |
| 5939980 |
Telecommunity alarm system with a plurality of security surveillance modems |
Aug. 17, 1999 |
| 5932815 |
Anchor monitoring system |
Aug. 3, 1999 |
| 5933080 |
Emergency calling system |
Aug. 3, 1999 |
| 5926103 |
Personalized security system |
Jul. 20, 1999 |
| 5917775 |
Apparatus for detecting the discharge of a firearm and transmitting an alerting signal to a predetermined location |
Jun. 29, 1999 |
| 5914658 |
Crime prevention display device, exhibit crime prevention alarm control method and apparatus therefor |
Jun. 22, 1999 |
| 5905433 |
Trailer communications system |
May. 18, 1999 |
| 5898369 |
Communicating hazardous condition detector |
Apr. 27, 1999 |
| 5892442 |
Two-way pager alarm system |
Apr. 6, 1999 |
| 5867097 |
Method and apparatus for alarm signal processing |
Feb. 2, 1999 |
| 5861804 |
Computer controlled security and surveillance system |
Jan. 19, 1999 |
| 5831526 |
Atmospheric hazard detector network |
Nov. 3, 1998 |
| 5815074 |
Signal transmission apparatus |
Sep. 29, 1998 |
| 5815550 |
Remote conference calling for wireline systems |
Sep. 29, 1998 |
| 5812054 |
Device for the verification of an alarm |
Sep. 22, 1998 |
| 5805063 |
Wireless security sensor transmitter |
Sep. 8, 1998 |
| 5786757 |
Load shed scheme for two wire data transmission |
Jul. 28, 1998 |
| 5774050 |
Radio alarm security system |
Jun. 30, 1998 |
| 5761206 |
Message packet protocol for communication of remote sensor information in a wireless security system |
Jun. 2, 1998 |
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