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Class Information
Number: 340/509
Name: Communications: electrical > Condition responsive indicating system > With particular system function (e.g., temperature compensation, calibration) > Alarm system supervision > Plural or diverse current sources
Description: Subject matter having plural, or diverse current sources, with the supervisory current typically being imposed on the primary alarm circuit.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7561059 |
Anti-tamper electronic obscurity using E-fuse technology |
Jul. 14, 2009 |
| 7498934 |
Power supply and useful data exchange between a fire alarm control unit and a current sink |
Mar. 3, 2009 |
| 7161478 |
Methods and apparatus for generating a data structure indicative of an alarm system circuit |
Jan. 9, 2007 |
| 7081827 |
Power over Ethernet-prioritized active splitter |
Jul. 25, 2006 |
| 7079022 |
Emergency activation apparatus for a technical device |
Jul. 18, 2006 |
| 7058967 |
Video distribution system and method |
Jun. 6, 2006 |
| 7054771 |
Bus line current calibration |
May. 30, 2006 |
| 7030748 |
Enhanced visual signaling for an adverse condition detector |
Apr. 18, 2006 |
| 6992575 |
Methods and apparatus for generating a data structure indicative of an alarm system circuit |
Jan. 31, 2006 |
| 6954142 |
Surveillance system and method |
Oct. 11, 2005 |
| 6816125 |
Forming electromagnetic communication circuit components using densified metal powder |
Nov. 9, 2004 |
| 6642843 |
Management system |
Nov. 4, 2003 |
| 6577232 |
Monopolar, synchronized communication system |
Jun. 10, 2003 |
| 6498563 |
Synchronized communication system |
Dec. 24, 2002 |
| 6483431 |
Electrical circuit for transmitting state information, in particular concerning some member in railway rolling-stock, and an electrical system incorporating such a circuit |
Nov. 19, 2002 |
| 6384723 |
Digital communication system and method |
May. 7, 2002 |
| 6259363 |
Detector removal signalling device |
Jul. 10, 2001 |
| 5804891 |
Battery saving switching mechanism |
Sep. 8, 1998 |
| 5757265 |
Multiple-cable field bus system |
May. 26, 1998 |
| 5448231 |
Method and apparatus for transmitting signals on a transmission line |
Sep. 5, 1995 |
| 5402101 |
Method for determining the configuration of detectors of a danger alarm system and for determining the system configuration of suitable detectors |
Mar. 28, 1995 |
| 5347225 |
Network monitor and test apparatus |
Sep. 13, 1994 |
| 5260664 |
Network monitor and test apparatus |
Nov. 9, 1993 |
| 5216410 |
Intrusion alarm sensing unit |
Jun. 1, 1993 |
| 5200734 |
Detecting and alarming system for detecting shortcircuited or broken circuit |
Apr. 6, 1993 |
| 5144283 |
Energy efficient alarm system and regulative central control unit |
Sep. 1, 1992 |
| 5121102 |
Programmable voltage source with isolation network |
Jun. 9, 1992 |
| 5086293 |
Line interruption supervisory device for a fire alarm system |
Feb. 4, 1992 |
| 5083107 |
Fire alarm system |
Jan. 21, 1992 |
| 5057817 |
Intruder detection system with passive self-supervision |
Oct. 15, 1991 |
| 5057816 |
Multizone intruder detection system with forced walk-test |
Oct. 15, 1991 |
| 4970508 |
System for monitoring switch locations |
Nov. 13, 1990 |
| 4833451 |
Individual source identification |
May. 23, 1989 |
| 4760379 |
Fail-safe high temperature alarm |
Jul. 26, 1988 |
| 4728861 |
Light control apparatus for a vehicle |
Mar. 1, 1988 |
| 4703312 |
Voice-override alarm system |
Oct. 27, 1987 |
| 4622539 |
Alarm system with alarm message supervision |
Nov. 11, 1986 |
| 4578669 |
Remote switch position indicator |
Mar. 25, 1986 |
| 4563672 |
Microprocessor automatic program fail reset circuit |
Jan. 7, 1986 |
| 4549168 |
Remote station monitoring system |
Oct. 22, 1985 |
| 4529970 |
Supervision system for monitoring the integrity of a transmission line |
Jul. 16, 1985 |
| 4529971 |
Alarm loop supervision |
Jul. 16, 1985 |
| 4356474 |
Alarm system |
Oct. 26, 1982 |
| 4319231 |
Fire sensing system protected from noise factors |
Mar. 9, 1982 |
| 4234873 |
Alarm installation with a number of self powered indicating elements |
Nov. 18, 1980 |
| 4199754 |
Circuit for an emergency lighting and fire detector system |
Apr. 22, 1980 |
| 4138670 |
A.C. powered detecting device with battery backup |
Feb. 6, 1979 |
| 4083039 |
Voltage enhancement circuit for central station monitored alarm systems |
Apr. 4, 1978 |
| 4065759 |
Smoke detector |
Dec. 27, 1977 |
| 4054867 |
Detecting damage to bulk material |
Oct. 18, 1977 |
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