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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4779450 Method and apparatus for installing a fluid probeExpiredFeb 22, 88Oct 25, 88[G01M]
4765178 Hydrocarbon probeExpiredMar 31, 86Aug 23, 88[G01M]
4748688 Electromagnetic wave receiverExpiredApr 28, 86May 31, 88[H04B]
4737771 Security system with interference detectionExpiredJul 23, 86Apr 12, 88[G08B, H04Q]
4734680 Detection system with randomized transmissionsExpiredFeb 06, 86Mar 29, 88[G08B]
4684853 Garage door opener using transmitter with SAW oscillator modulatorExpiredJul 25, 86Aug 04, 87[H04Q]
4682157 Polar fluid detection system unaffected by power line voltagesExpiredFeb 27, 86Jul 21, 87[H03K, G08B, H01H]
4672365 Security system with digital data filteringExpiredJun 06, 86Jun 09, 87[G08B]
D277836 Smoke alarmExpiredJan 12, 83Mar 05, 85[]
D273583 Speaker enclosureExpiredDec 30, 81Apr 24, 84[]
4424881 Speaker assemblyExpiredFeb 17, 82Jan 10, 84[H05K]
4409589 Adjustable electric bellExpiredOct 16, 81Oct 11, 83[G08B]
4257038 Coded security systemExpiredFeb 28, 79Mar 17, 81[G08B, B60R]

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