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Class Information
Number: 340/511
Name: Communications: electrical > Condition responsive indicating system > With particular system function (e.g., temperature compensation, calibration) > Alarm system supervision > Threshold or window (e.g., of analog electrical level)
Description: Subject matter wherein the supervisory circuit is coupled to the primary alarm circuit and is responsive to the signal therein attaining a predetermined level or range of levels.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4549168 |
Remote station monitoring system |
Oct. 22, 1985 |
| 4546344 |
Temperature compensated alarm system |
Oct. 8, 1985 |
| 4543567 |
Method for controlling output of alarm information |
Sep. 24, 1985 |
| 4543565 |
Method and apparatus for monitoring an alarm system |
Sep. 24, 1985 |
| 4536751 |
System for detecting an alarm |
Aug. 20, 1985 |
| 4536748 |
Process for protecting a remote monitoring system against sabotage and a system using this process |
Aug. 20, 1985 |
| 4529970 |
Supervision system for monitoring the integrity of a transmission line |
Jul. 16, 1985 |
| 4525700 |
Fire alarm system |
Jun. 25, 1985 |
| 4524349 |
Security system having detector sensing and identification |
Jun. 18, 1985 |
| 4523183 |
Alarm-fault detecting system |
Jun. 11, 1985 |
| 4518952 |
Sensor test circuit of an alarm system |
May. 21, 1985 |
| 4517554 |
Method and apparatus for inspecting a danger alarm system |
May. 14, 1985 |
| 4514720 |
Method and apparatus for increasing the response sensitivity and the interference resistance in an alarm system |
Apr. 30, 1985 |
| 4506254 |
Alarm system with detectors and signaling devices on the same cable pair |
Mar. 19, 1985 |
| 4506253 |
Supervisory and control circuit for alarm system |
Mar. 19, 1985 |
| 4491828 |
Two-wire multi-zone alarm system |
Jan. 1, 1985 |
| 4491968 |
Status monitor |
Jan. 1, 1985 |
| 4485373 |
Automatic security monitoring system |
Nov. 27, 1984 |
| 4470047 |
Bidirectional, interactive fire detection system |
Sep. 4, 1984 |
| 4459583 |
Alarm system |
Jul. 10, 1984 |
| 4455550 |
Detection circuit for a video intrusion monitoring apparatus |
Jun. 19, 1984 |
| 4450435 |
Analog debris alarm |
May. 22, 1984 |
| 4423410 |
Two-wire multi-zone alarm system |
Dec. 27, 1983 |
| 4420745 |
Security system |
Dec. 13, 1983 |
| 4414539 |
Built-in passive fault detection circuitry for an aircraft's electrical/electronic systems |
Nov. 8, 1983 |
| 4414540 |
Automatic redundant transducer selector for a steam turbine control system |
Nov. 8, 1983 |
| 4404548 |
Method for transmitting measuring values in a fire alarm system and apparatus for the performance of the aforesaid method |
Sep. 13, 1983 |
| 4394655 |
Bidirectional, interactive fire detection system |
Jul. 19, 1983 |
| 4383250 |
System for intrusion detection |
May. 10, 1983 |
| 4369436 |
Anti-bridging cable supervision circuit |
Jan. 18, 1983 |
| 4363030 |
Fail-safe instrument system |
Dec. 7, 1982 |
| 4361833 |
Multi-sensor alarm system and method of protecting a premises |
Nov. 30, 1982 |
| 4359721 |
Two-wire multi-zone alarm system |
Nov. 16, 1982 |
| 4358755 |
Signal selection circuit |
Nov. 9, 1982 |
| 4356476 |
Multiple alarm detector monitoring and command system |
Oct. 26, 1982 |
| 4348661 |
Self-balancing alarm system |
Sep. 7, 1982 |
| 4342022 |
Warning lamp arrangements for vehicle battery charging systems |
Jul. 27, 1982 |
| 4322723 |
Fault detection in a flame scanner |
Mar. 30, 1982 |
| 4283717 |
Monitoring system for a direct-wire alarm system |
Aug. 11, 1981 |
| 4282517 |
Automatic ringback for direct current monitoring system |
Aug. 4, 1981 |
| 4260981 |
Physical condition monitoring system for detection in remote places |
Apr. 7, 1981 |
| 4251769 |
Indicator and limit value alarm device |
Feb. 17, 1981 |
| 4241335 |
Automatically supervised alarm system |
Dec. 23, 1980 |
| 4229733 |
Exposure detecting device |
Oct. 21, 1980 |
| 4203095 |
Monitoring apparatus for direct wire alarm system |
May. 13, 1980 |
| 4138670 |
A.C. powered detecting device with battery backup |
Feb. 6, 1979 |
| 4118700 |
Single wire transmission of multiple switch operations |
Oct. 3, 1978 |
| 4096473 |
High output smoke and heat detector alarm system utilizing a piezoelectric transducer and a voltage doubling means |
Jun. 20, 1978 |
| 4077030 |
Sensor data input by means of analog to pulse width-to digital converter |
Feb. 28, 1978 |
| 4057798 |
Security system |
Nov. 8, 1977 |
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