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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 |
| 4057798 |
Security system |
Nov. 8, 1977 |
| 4051467 |
Fluid flow detector for a fire alarm system |
Sep. 27, 1977 |
| 4030095 |
Pulsed alarm system |
Jun. 14, 1977 |
| 4020479 |
Fire detector |
Apr. 26, 1977 |
| 4020488 |
Alarm and/or control apparatus |
Apr. 26, 1977 |
| 4006460 |
Computer controlled security system |
Feb. 1, 1977 |
| 3997890 |
Alarm system with supervisory system to detect severing or bridging of detection switches |
Dec. 14, 1976 |
| 3990075 |
Solid state security system |
Nov. 2, 1976 |
| 3980995 |
Alarm system |
Sep. 14, 1976 |
| 3978479 |
Solid state security system |
Aug. 31, 1976 |
| 3978475 |
Trouble indicator circuit for a security system |
Aug. 31, 1976 |
| 3974489 |
Centralized monitor and alarm system for monitoring remote areas with acoustical electric transducers |
Aug. 10, 1976 |
| 3973257 |
Apparatus for detecting changes in the electrical characteristics of sensor devices |
Aug. 3, 1976 |
| RE28692 |
Monitoring apparatus and method for electrical protection systems |
Jan. 20, 1976 |
| 3932870 |
On-line test circuit for intrusion alarm systems |
Jan. 13, 1976 |
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