Assignee
C & K SYSTEMS INC
US·32 granted patents·1,267 citations·filing 1983–1998
Top patents by PatentIndex Score
32 records- 0192US5164703AAudio intrusion detection systemC & K SYSTEMS INC·Filed 1991·Granted Nov 17, 1992·238 cites·16 claims
- 0292US4882567AIntrusion detection system and a method thereforC & K SYSTEMS INC·Filed 1988·Granted Nov 21, 1989·105 cites·11 claims
- 0383US4710750AFault detecting intrusion detection deviceC & K SYSTEMS INC·Filed 1986·Granted Dec 1, 1987·53 cites·6 claims
- 0481US5578988AIntrusion detection system having self-adjusting thresholdC & K SYSTEMS INC·Filed 1994·Granted Nov 26, 1996·78 cites·27 claims
- 0581US5196826ASensor for detecting the passage of a person or an animal in a field of viewC & K SYSTEMS INC·Filed 1991·Granted Mar 23, 1993·54 cites·8 claims
- 0679US5471195ADirection-sensing acoustic glass break detecting systemC & K SYSTEMS INC·Filed 1994·Granted Nov 28, 1995·77 cites·14 claims
- 0777US5017783A360 degree field of view optical sensing deviceC & K SYSTEMS INC·Filed 1989·Granted May 21, 1991·37 cites·3 claims
- 0874USD354925SInfra-red intruder detectorC & K SYSTEMS INC·Filed 1994·Granted Jan 31, 1995·18 cites·1 claims
- 0973USD307245SIntrusion detector unitC & K SYSTEMS INC·Filed 1987·Granted Apr 17, 1990·18 cites·1 claims
- 1073US4841284AInfrared intrusion detection system incorporating a fresnel lens and a mirrorC & K SYSTEMS INC·Filed 1987·Granted Jun 20, 1989·44 cites·5 claims
- 1172US5473311AMethod and apparatus to distinguish human intruder and animal intruderC & K SYSTEMS INC·Filed 1994·Granted Dec 5, 1995·48 cites·19 claims
- 1272USD328875SInfrared detector mirrorC & K SYSTEMS INC·Filed 1990·Granted Aug 25, 1992·17 cites·1 claims
- 1369US5583523APlanar microwave tranceiver employing shared-ground-plane antennaC & K SYSTEMS INC·Filed 1995·Granted Dec 10, 1996·46 cites·41 claims
- 1468US5475365AMethods and apparatus for intrusion detection having improved immunity to false alarmsC & K SYSTEMS INC·Filed 1994·Granted Dec 12, 1995·36 cites·38 claims
- 1567US5438869AProtective reed switch housingC & K SYSTEMS INC·Filed 1993·Granted Aug 8, 1995·29 cites·25 claims
- 1667US5395263ADual battery holderC & K SYSTEMS INC·Filed 1993·Granted Mar 7, 1995·36 cites·3 claims
- 1765US5371509APlanar microwave transceiver employing shared-ground-plane antennaC & K SYSTEMS INC·Filed 1993·Granted Dec 6, 1994·35 cites·40 claims
- 1864US5089704AWide angle ceiling mounted passive infrared intrusion detection systemC & K SYSTEMS INC·Filed 1990·Granted Feb 18, 1992·36 cites·20 claims
- 1962US5818337AMasked passive infrared intrusion detection device and method of operation thereforeC & K SYSTEMS INC·Filed 1997·Granted Oct 6, 1998·32 cites·13 claims
- 2062US5491467ALocation independent intrusion detection systemC & K SYSTEMS INC·Filed 1994·Granted Feb 13, 1996·38 cites·4 claims
- 2159US5581236AMethods and apparatus for intrusion detection having improved immunity to false alarmsC & K SYSTEMS INC·Filed 1994·Granted Dec 3, 1996·24 cites·8 claims
- 2258US5499012AIntrusion detector test circuit which automatically disables a detected-event indicatorC & K SYSTEMS INC·Filed 1994·Granted Mar 12, 1996·28 cites·19 claims
- 2358US5323141AGlass break sensor having reduced false alarm probability for use with intrusion alarmsC & K SYSTEMS INC·Filed 1992·Granted Jun 21, 1994·33 cites·9 claims
- 2449US5023594ACeiling mount microwave transceiver with 360 degree radiation patternC & K SYSTEMS INC·Filed 1990·Granted Jun 11, 1991·19 cites·14 claims
- 2548US5524099AIntrusion detector operating mode selection systemC & K SYSTEMS INC·Filed 1994·Granted Jun 4, 1996·19 cites·29 claims
- 2646US5969506AApparatus and method for rapid bulk charging of a lead acid batteryC & K SYSTEMS INC·Filed 1998·Granted Oct 19, 1999·27 cites·20 claims
- 2746US5376919AVehicle intrusion detectorC & K SYSTEMS INC·Filed 1992·Granted Dec 27, 1994·17 cites·19 claims
- 2845USD281765SDetector housingC & K SYSTEMS INC·Filed 1983·Granted Dec 17, 1985·3 cites·1 claims
- 2934US5341122APressure actuated glass break simulatorC & K SYSTEMS INC·Filed 1992·Granted Aug 23, 1994·15 cites·17 claims
- 3031US6121876ASystem for absorbing and or scattering superfluous radiation in an optical motion sensorC & K SYSTEMS INC·Filed 1998·Granted Sep 19, 2000·5 cites·37 claims
- 3130US5377049AMethod of making a segmented focusing mirrorC & K SYSTEMS INC·Filed 1993·Granted Dec 27, 1994·2 cites·6 claims
- 3230US5254965AProtective reed switch housingC & K SYSTEMS INC·Filed 1991·Granted Oct 19, 1993·0 cites·6 claims
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