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Class Information
Number: 340/563
Name: Communications: electrical > Condition responsive indicating system > Specific condition > Intrusion detection > Disturbance of electric field > Capacitance > With bridge
Description: Subject matter wherein the capacitance change sensing system is a bridge circuit.

Patents under this class:

Patent Number Title Of Patent Date Issued
8280302 Communication device and method, and program Oct. 2, 2012
8040241 Capacitance-based occupant detection system and occupant protection system Oct. 18, 2011
7132768 Human body detecting device Nov. 7, 2006
5859586 Electronic article surveillance system Jan. 12, 1999
5076566 Self-calibrating system for detecting media movement by using capacitors as sensors Dec. 31, 1991
5035415 System for detecting the accurate positioning of sheets along a feed path by using capacitors as sensors Jul. 30, 1991
5001459 Escalator handrail guard warning device Mar. 19, 1991
4691195 Self-contained refrigerator open door indicator Sep. 1, 1987
4684931 Capacitive sensing security system Aug. 4, 1987
4661797 Electronic warning and monitoring apparatus and electrode arrangement therefor Apr. 28, 1987
4420745 Security system Dec. 13, 1983
4352090 Detection and alarm device for use with car for detecting obstacle and abnormal conditions of tire Sep. 28, 1982
4300116 Safety method and apparatus for sensing the presence of individuals adjacent a vehicle Nov. 10, 1981
4208695 Proximity detector Jun. 17, 1980
4063447 Bridge circuit with drift compensation Dec. 20, 1977
3947734 Electronic personnel safety sensor Mar. 30, 1976
3939770 Short range passive electromagnetic detector Feb. 24, 1976

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