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Browse by Category: Main > Communications
Class Information
Number: 340/553
Name: Communications: electrical > Condition responsive indicating system > Specific condition > Intrusion detection > Disturbance of electromagnetic waves > Standing waves
Description: Subject matter wherein the electromagnetic waves are stationary (i.e., have maxima and minima at fixed positions).










Patents under this class:

Patent Number Title Of Patent Date Issued
8680998 Determining enclosure breach electromagnetically Mar. 25, 2014
8593279 System for detecting persons in a defined space Nov. 26, 2013
8552865 Self-test method for a microwave module Oct. 8, 2013
8390449 Intrusion detection system and sensor device thereof Mar. 5, 2013
8138918 Intrusion detection and tracking system Mar. 20, 2012
7839291 Water safety monitor systems and methods Nov. 23, 2010
7834612 Method and apparatus for regulating voltage in a remote device Nov. 16, 2010
7701337 Hybrid-technology metal detector Apr. 20, 2010
7456739 Approach detecting system Nov. 25, 2008
7330123 Sonar based drowning monitor Feb. 12, 2008
7298262 System and method for detecting seat occupancy in a vehicle Nov. 20, 2007
7173537 Device for protecting against accidental contact and method for protecting against accidental contact of a displaceable part Feb. 6, 2007
7154392 Wide-area intruder detection and tracking network Dec. 26, 2006
6954145 Proximate sensor using micro impulse waves for monitoring the status of an object, and monitoring system employing the same Oct. 11, 2005
6885300 Broad field motion detector Apr. 26, 2005
6794988 Control device for a motor vehicle Sep. 21, 2004
6424259 Intruder/escapee detection system and method using a distributed antenna and an array of discrete antennas Jul. 23, 2002
6333691 Motion detector Dec. 25, 2001
6323768 Electromagnetic energy detection Nov. 27, 2001
6239702 Electromagnetic energy detection May. 29, 2001
6127926 Intrusion sensing systems Oct. 3, 2000
5959534 Swimming pool alarm Sep. 28, 1999
5894262 Electronic doorbell with reversible diode Apr. 13, 1999
5828626 Acoustic object detection system and method Oct. 27, 1998
5790025 Tamper detection using bulk multiple scattering Aug. 4, 1998
5680445 Condition responsive indicating system for interactively indicating status of a plurality of electrical appliances Oct. 21, 1997
5610580 Motion detection imaging device and method Mar. 11, 1997
5396217 Phase shift analysis for vehicle intrusion detection Mar. 7, 1995
5376922 Wireless bistatic link intrusion detection system Dec. 27, 1994
5367288 Portable alarm device for detecting objects transgressing distance thresholds Nov. 22, 1994
5227667 Microwave proximity switch Jul. 13, 1993
5160915 Wireless bistatic link intrusion detection system Nov. 3, 1992
5043705 Method and system for detecting a motionless body in a pool Aug. 27, 1991
4661936 Apparatus for and method of doppler motion detection with standing wave drift compensation Apr. 28, 1987
4652864 Microwave proximity sensor Mar. 24, 1987
4638294 Unauthorized entry detection system Jan. 20, 1987
4613812 Microwave detection system Sep. 23, 1986
4580249 Apparatus for and method of doppler motion detection with standing wave drift compensation Apr. 1, 1986
4562428 Intrusion detector Dec. 31, 1985
4475089 Proximity detector Oct. 2, 1984
4458240 Energy wave electronic intruder detection system Jul. 3, 1984
4415885 Intrusion detector Nov. 15, 1983
4375057 Position sensor Feb. 22, 1983
4342021 Position or movement sensor, e.g. for conveyances such as lifts Jul. 27, 1982
4236147 Automatic doorbell Nov. 25, 1980
4215341 Intrusion or movement detector Jul. 29, 1980
4109233 Proximity sensor Aug. 22, 1978
4079361 Intrusion sensor and aerial therefor Mar. 14, 1978











 
 
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