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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 |
| 4389639 |
Voice warning device using entertainment speaker |
Jun. 21, 1983 |
| 4386436 |
Television remote control system for selectively controlling external apparatus through the AC power line |
May. 31, 1983 |
| 4379289 |
Fiber optics security system |
Apr. 5, 1983 |
| 4378554 |
Fixed/movable supervised alarm loop |
Mar. 29, 1983 |
| 4375637 |
Integrated alarm, security, building management, and communications system |
Mar. 1, 1983 |
| 4367458 |
Supervised wireless security system |
Jan. 4, 1983 |
| 4361832 |
Automatic centralized monitoring system |
Nov. 30, 1982 |
| 4356475 |
System containing a predetermined number of monitoring devices and at least one central station |
Oct. 26, 1982 |
| 4347501 |
Installation for transmitting alarm signals |
Aug. 31, 1982 |
| 4342986 |
Central station alarm reporting system |
Aug. 3, 1982 |
| 4331952 |
Redundant sensor adapter |
May. 25, 1982 |
| 4321592 |
Multiple sensor intrusion detection system |
Mar. 23, 1982 |
| 4309698 |
Acoustic fire detection circuit responsive to microcapsule ruptures |
Jan. 5, 1982 |
| 4307386 |
Security system and strip or strand incorporating fibre-optic wave guide means therefor |
Dec. 22, 1981 |
| 4292628 |
Fibre optic security system |
Sep. 29, 1981 |
| 4287511 |
Intrusion alarm system utilizing structural moment detector as intrusion sensor and as receiver for mechanical intrusion and command signals |
Sep. 1, 1981 |
| 4275294 |
Security system and strip or strand incorporating fibre-optic wave-guide means therefor |
Jun. 23, 1981 |
| 4274086 |
Security alarm system |
Jun. 16, 1981 |
| 4271405 |
Alarm control system |
Jun. 2, 1981 |
| 4268822 |
Apparatus for determining the state of each of a plurality of bi-state devices |
May. 19, 1981 |
| 4258352 |
Control device for vehicle locks |
Mar. 24, 1981 |
| 4254410 |
Pseudo-random pulse line security monitoring system |
Mar. 3, 1981 |
| 4229734 |
Line supervision |
Oct. 21, 1980 |
| 4224485 |
Telephone jack |
Sep. 23, 1980 |
| 4223303 |
Alarm devices for interconnected multi-device systems |
Sep. 16, 1980 |
| 4207561 |
Intruder alarm arrangement for an optical communication system |
Jun. 10, 1980 |
| 4207559 |
Alarm system with acoustically coupled transmitters and receiver |
Jun. 10, 1980 |
| 4198624 |
Alarm system |
Apr. 15, 1980 |
| 4195288 |
Alarm system |
Mar. 25, 1980 |
| 4191947 |
Intrusion alarm system |
Mar. 4, 1980 |
| 4189720 |
Repeater for smoke and similar alarms |
Feb. 19, 1980 |
| 4168494 |
Livestock confinement structure monitor |
Sep. 18, 1979 |
| 4167732 |
Multi-apartment building combination communication and security circuit |
Sep. 11, 1979 |
| 4157540 |
Wireless alarm system |
Jun. 5, 1979 |
| 4149158 |
Security system for CATV terminal |
Apr. 10, 1979 |
| 4148021 |
Alarm system utilizing bidirectional wired television system |
Apr. 3, 1979 |
| 4148020 |
Fail-safe alarm system utilizing frequency modulated signal detection |
Apr. 3, 1979 |
| 4148019 |
Security alarm transmission system |
Apr. 3, 1979 |
| 4144530 |
Combined intrusion sensor line |
Mar. 13, 1979 |
| 4139843 |
Alarm system |
Feb. 13, 1979 |
| 4136338 |
Perimeter alarm apparatus |
Jan. 23, 1979 |
| 4125826 |
Ultrasonic vehicle alarm system |
Nov. 14, 1978 |
| 4114150 |
Alarm system |
Sep. 12, 1978 |
| 4101886 |
Apparatus for conserving energy in electrical appliances |
Jul. 18, 1978 |
| 4092642 |
Plural sensor monitoring and display device |
May. 30, 1978 |
| 4057783 |
Device for transmitting the condition of a switch between two parts in relative rotary movement |
Nov. 8, 1977 |
| 4055844 |
Detection system |
Oct. 25, 1977 |
| 4032909 |
Arrangement for testing an alarm system and method |
Jun. 28, 1977 |
| 4001805 |
Sound activated alarm system |
Jan. 4, 1977 |
| 4001703 |
Transmission line interface circuit |
Jan. 4, 1977 |
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