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Class Information
Number: 340/513
Name: Communications: electrical > Condition responsive indicating system > With particular system function (e.g., temperature compensation, calibration) > Alarm system supervision > Diode
Description: Subject matter having a diode added to the primary alarm circuit by which a supervisory current may be effective.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7548157 |
Battery backed service indicator aids for field maintenance |
Jun. 16, 2009 |
| 7259665 |
Battery backed service indicator aids for field maintenance |
Aug. 21, 2007 |
| 7161495 |
Alert for indicating validity of removable memory media |
Jan. 9, 2007 |
| 6838292 |
Detection of biological warfare agents |
Jan. 4, 2005 |
| 6384723 |
Digital communication system and method |
May. 7, 2002 |
| 5963850 |
Method and apparatus for verifying the operability of a balanced diode mixer and local oscillator combination |
Oct. 5, 1999 |
| 5894262 |
Electronic doorbell with reversible diode |
Apr. 13, 1999 |
| 5606305 |
Ultra-sonic dog-expelling device |
Feb. 25, 1997 |
| 5578828 |
Flame sensor window coating compensation |
Nov. 26, 1996 |
| 5525962 |
Communication system and method |
Jun. 11, 1996 |
| 5387899 |
Alarm system with monitoring circuit for detecting a cut or short in a pair of wires |
Feb. 7, 1995 |
| 5260605 |
Broadband load disconnect voltage inversion |
Nov. 9, 1993 |
| 5140306 |
Alarm indicating system |
Aug. 18, 1992 |
| 5043703 |
Supervision of autodyne microwave motion-detection system |
Aug. 27, 1991 |
| 5043700 |
Multi-input electrical monitor |
Aug. 27, 1991 |
| 5043701 |
Multi-input electrical monitor |
Aug. 27, 1991 |
| 5029290 |
Emergency alert system |
Jul. 2, 1991 |
| 4926162 |
High security communication line monitor |
May. 15, 1990 |
| 4849734 |
Self-diagnostic circuit for alarm-systems |
Jul. 18, 1989 |
| 4833451 |
Individual source identification |
May. 23, 1989 |
| 4764754 |
Fail-safe alarm circuit |
Aug. 16, 1988 |
| 4725821 |
Device for generating an alarm signal |
Feb. 16, 1988 |
| 4717907 |
Remote parameter monitoring system with location-specific indicators |
Jan. 5, 1988 |
| 4656615 |
Hydrophone array polarity test circuit |
Apr. 7, 1987 |
| 4646065 |
Fault-tolerant control system |
Feb. 24, 1987 |
| 4625198 |
Alarm system diagnostic apparatus |
Nov. 25, 1986 |
| 4578669 |
Remote switch position indicator |
Mar. 25, 1986 |
| 4567471 |
Monitoring system |
Jan. 28, 1986 |
| 4506253 |
Supervisory and control circuit for alarm system |
Mar. 19, 1985 |
| 4506254 |
Alarm system with detectors and signaling devices on the same cable pair |
Mar. 19, 1985 |
| 4498074 |
Selectively testable fire detector |
Feb. 5, 1985 |
| 4376277 |
Dynamic contact checking circuit |
Mar. 8, 1983 |
| 4270121 |
Circuitry for burglar alarm annunciator |
May. 26, 1981 |
| 4091363 |
Self-contained fire detector with interconnection circuitry |
May. 23, 1978 |
| 4020488 |
Alarm and/or control apparatus |
Apr. 26, 1977 |
| 4017852 |
Apparatus for supervising leads interconnecting a plurality of self-contained abnormal condition sensing and alarm annunciating units |
Apr. 12, 1977 |
| 3997890 |
Alarm system with supervisory system to detect severing or bridging of detection switches |
Dec. 14, 1976 |
| 3936821 |
Supervisory circuit for parallel connected devices |
Feb. 3, 1976 |
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