SENTROL, INC. A CORP. OF OREGON

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5283551 Intrusion alarm systemExpiredDec 31, 91Feb 01, 94[G08B]
4906976 Infrared detectorExpiredMar 18, 88Mar 06, 90[G08B]
4875029 Suppressed transient uniform detection sensitivity pir detectorExpiredDec 30, 87Oct 17, 89[G08B]
D297128 Alarm displayExpiredAug 01, 85Aug 09, 88[]
4745398 Self-powered sensor for use in closed-loop security systemExpiredFeb 09, 87May 17, 88[G08B]
4728935 Integrity securing monitor and method for a security installationExpiredApr 11, 86Mar 01, 88[G08B]
4692752 Moisture detectorExpiredAug 27, 84Sep 08, 87[G08B]
4584485 Optical block in smoke detectorsExpiredAug 22, 83Apr 22, 86[G01N]
RE32105 Forward scatter smoke detectorExpiredNov 19, 84Apr 01, 86[G08B]
4543458 Switch and connector assembly including protective housings for jumper cableExpiredAug 24, 84Sep 24, 85[H01H]
4532507 Security system with multiple levels of accessExpiredNov 04, 83Jul 30, 85[G07C]
D279872 Photoelectric smoke detectorExpiredAug 22, 83Jul 30, 85[]
D279769 Smoke detectorExpiredAug 19, 83Jul 23, 85[]
4514631 Optical system for ceiling mounted passive infrared sensorExpiredDec 30, 82Apr 30, 85[G01J]
4513354 Housing for an electronic circuit boardExpiredSep 26, 83Apr 23, 85[H05K]
4488049 Moving wall test device in optical smoke detectorsExpiredNov 09, 81Dec 11, 84[G08B, G01N]
D272530 Control panelExpiredNov 13, 81Feb 07, 84[D130]
4430646 Forward scatter smoke detectorExpiredDec 31, 80Feb 07, 84[G08B]
4424553 Multidirectional mount for electrical instrumentsExpiredNov 09, 81Jan 03, 84[H02B, H05K]
D271671 Smoke detectorExpiredNov 09, 81Dec 06, 83[D100]

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