Assignee
AMERICAN DISTRICT TELEGRAPH CO
US·69 granted patents·2,503 citations·filing 1974–1985
Top patents by PatentIndex Score
69 records- 0197US4321594APassive infrared detectorAMERICAN DISTRICT TELEGRAPH CO·Filed 1979·Granted Mar 23, 1982·124 cites·8 claims
- 0296US4206449AMultiple sensor intrusion alarm systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1977·Granted Jun 3, 1980·199 cites·13 claims
- 0394US4195286AAlarm system having improved false alarm rate and detection reliabilityAMERICAN DISTRICT TELEGRAPH CO·Filed 1978·Granted Mar 25, 1980·71 cites·5 claims
- 0493US4459582ALocal control apparatus for central station alarm systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1983·Granted Jul 10, 1984·163 cites·9 claims
- 0591US4636774AVariable sensitivity motion detectorAMERICAN DISTRICT TELEGRAPH CO·Filed 1983·Granted Jan 13, 1987·72 cites·9 claims
- 0689US4396910ACoded security switchAMERICAN DISTRICT TELEGRAPH CO·Filed 1980·Granted Aug 2, 1983·68 cites·15 claims
- 0789US4068105ACentral station system transmission apparatusAMERICAN DISTRICT TELEGRAPH CO·Filed 1976·Granted Jan 10, 1978·63 cites·39 claims
- 0889US3983552APilferage detection systemsAMERICAN DISTRICT TELEGRAPH CO·Filed 1975·Granted Sep 28, 1976·50 cites·37 claims
- 0988US4544836AOptically-based access control systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1982·Granted Oct 1, 1985·93 cites·15 claims
- 1088US4538138AIntegrated security system having a multiprogrammed controllerAMERICAN DISTRICT TELEGRAPH CO·Filed 1982·Granted Aug 27, 1985·87 cites·27 claims
- 1187US4051467AFluid flow detector for a fire alarm systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1976·Granted Sep 27, 1977·58 cites·18 claims
- 1286US4375034APassive infrared intrusion detection systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1980·Granted Feb 22, 1983·52 cites·26 claims
- 1385US4622540ASecurity system status reportingAMERICAN DISTRICT TELEGRAPH CO·Filed 1984·Granted Nov 11, 1986·53 cites·12 claims
- 1485US4614968AContrast smoke detectorAMERICAN DISTRICT TELEGRAPH CO·Filed 1982·Granted Sep 30, 1986·52 cites·11 claims
- 1584US4427974ALocal control apparatus for central station alarm systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1982·Granted Jan 24, 1984·56 cites·3 claims
- 1683US4020477ARadio central station alarm systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1975·Granted Apr 26, 1977·35 cites·15 claims
- 1781US4608674AConstant range ultrasonic motion detectorAMERICAN DISTRICT TELEGRAPH CO·Filed 1982·Granted Aug 26, 1986·41 cites·22 claims
- 1880US4321592AMultiple sensor intrusion detection systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1978·Granted Mar 23, 1982·29 cites·9 claims
- 1980US3932870AOn-line test circuit for intrusion alarm systemsAMERICAN DISTRICT TELEGRAPH CO·Filed 1974·Granted Jan 13, 1976·24 cites·10 claims
- 2079US4679881AElectrical interconnection apparatus and techniqueAMERICAN DISTRICT TELEGRAPH CO·Filed 1985·Granted Jul 14, 1987·42 cites·8 claims
- 2179US4625199ACombination intrusion detector system having correlated ultrasonic and microwave detection sub-systemsAMERICAN DISTRICT TELEGRAPH CO·Filed 1985·Granted Nov 25, 1986·48 cites·16 claims
- 2278US4339748AMultiple range passive infrared detection systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1980·Granted Jul 13, 1982·38 cites·17 claims
- 2378US4258255AInfrared intrusion detection systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1979·Granted Mar 24, 1981·30 cites·11 claims
- 2478US4219806ADual alarm gas detectorAMERICAN DISTRICT TELEGRAPH CO·Filed 1978·Granted Aug 26, 1980·28 cites·4 claims
- 2577US4119815ACentral station system including secondary communication path established through commercial telephone networkAMERICAN DISTRICT TELEGRAPH CO·Filed 1977·Granted Oct 10, 1978·30 cites·18 claims
- 2675US4245215APower line signalling systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1979·Granted Jan 13, 1981·30 cites·14 claims
- 2775US4228379ADiaphragm type piezoelectric electroacoustic transducerAMERICAN DISTRICT TELEGRAPH CO·Filed 1978·Granted Oct 14, 1980·29 cites·21 claims
- 2874US4532507ASecurity system with multiple levels of accessAMERICAN DISTRICT TELEGRAPH CO·Filed 1983·Granted Jul 30, 1985·88 cites·22 claims
- 2974US4023156AAlarm system for detecting disturbance of a solid mediumAMERICAN DISTRICT TELEGRAPH CO·Filed 1975·Granted May 10, 1977·23 cites·5 claims
- 3073US4427888AInfrared imaging systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1981·Granted Jan 24, 1984·25 cites·12 claims
- 3173US4232307AElectrical test circuit for optical particle detectorAMERICAN DISTRICT TELEGRAPH CO·Filed 1978·Granted Nov 4, 1980·24 cites·4 claims
- 3272US4514631AOptical system for ceiling mounted passive infrared sensorAMERICAN DISTRICT TELEGRAPH CO·Filed 1982·Granted Apr 30, 1985·29 cites·15 claims
- 3372US4163969AVariable frequency light pulser for smoke detectorsAMERICAN DISTRICT TELEGRAPH CO·Filed 1977·Granted Aug 7, 1979·22 cites·6 claims
- 3471US4206366AOptical smoke detectorAMERICAN DISTRICT TELEGRAPH CO·Filed 1978·Granted Jun 3, 1980·21 cites·9 claims
- 3569US4424553AMultidirectional mount for electrical instrumentsAMERICAN DISTRICT TELEGRAPH CO·Filed 1981·Granted Jan 3, 1984·23 cites·11 claims
- 3669US4359721ATwo-wire multi-zone alarm systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1978·Granted Nov 16, 1982·20 cites·3 claims
- 3769US4131888ADual projected-beam smoke detectorAMERICAN DISTRICT TELEGRAPH CO·Filed 1976·Granted Dec 26, 1978·20 cites·13 claims
- 3868US4166698ASecondary light testing in optical smoke detectorsAMERICAN DISTRICT TELEGRAPH CO·Filed 1977·Granted Sep 4, 1979·19 cites·14 claims
- 3967US4423410ATwo-wire multi-zone alarm systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1982·Granted Dec 27, 1983·25 cites·3 claims
- 4067US4242673AOptical particle detectorAMERICAN DISTRICT TELEGRAPH CO·Filed 1978·Granted Dec 30, 1980·22 cites·5 claims
- 4166US4634846AMultimode programmable stand-alone access control systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1984·Granted Jan 6, 1987·49 cites·13 claims
- 4266US4032916AIntrusion alarm cable supervision systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1975·Granted Jun 28, 1977·21 cites·8 claims
- 4365US4430646AForward scatter smoke detectorAMERICAN DISTRICT TELEGRAPH CO·Filed 1980·Granted Feb 7, 1984·21 cites·5 claims
- 4464US4517555ASmoke detector with remote alarm indicationAMERICAN DISTRICT TELEGRAPH CO·Filed 1984·Granted May 14, 1985·25 cites·9 claims
- 4564US4412211ASystem for test sequence annunciationAMERICAN DISTRICT TELEGRAPH CO·Filed 1981·Granted Oct 25, 1983·27 cites·13 claims
- 4664US4117479AMulti-mode intrusion alarm systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1976·Granted Sep 26, 1978·19 cites·3 claims
- 4762US4584485AOptical block in smoke detectorsAMERICAN DISTRICT TELEGRAPH CO·Filed 1983·Granted Apr 22, 1986·22 cites·14 claims
- 4860US4149162ABattery discriminator circuit for smoke detectorsAMERICAN DISTRICT TELEGRAPH CO·Filed 1977·Granted Apr 10, 1979·17 cites·7 claims
- 4959US4331952ARedundant sensor adapterAMERICAN DISTRICT TELEGRAPH CO·Filed 1980·Granted May 25, 1982·22 cites·11 claims
- 5058US4491828ATwo-wire multi-zone alarm systemAMERICAN DISTRICT TELEGRAPH CO·Filed 1982·Granted Jan 1, 1985·19 cites·2 claims
Showing the top 50 of 69 patent records by PatentIndex Score.
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