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Browse by Category: Main > Communications
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:
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Patent Number Title Of Patent Date Issued
8704650 Tractor-trailer coupling detection Apr. 22, 2014
8319625 Fire alarm textual notification related application Nov. 27, 2012
8269620 Alarm trend summary display system and method Sep. 18, 2012
8106763 Sensor system and method for sequential transmission of data Jan. 31, 2012
8098148 Sensor signal processor apparatus Jan. 17, 2012
7999668 Series interlock system with integrated ability to identify breached locations Aug. 16, 2011
7990261 Speaker circuit resident notification appliances Aug. 2, 2011
7952482 Surface acoustic wave coding for orthogonal frequency coded devices May. 31, 2011
7911330 Tractor-trailer coupling detection Mar. 22, 2011
7853199 Alarm signaling with hybrid data and two-way voice channel Dec. 14, 2010
7834756 Failure current measurement for electronic control module Nov. 16, 2010
7786853 Method for transmitting data from at least one sensor to a control device Aug. 31, 2010
7755502 Anti-tamper electronic obscurity using E-fuse technology Jul. 13, 2010
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

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