Quartztronics, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5168191 Crystal resonator with low acceleration sensitivity and method of manufacture thereofExpiredSep 17, 90Dec 01, 92[H01L]
5030876 Mounting structure for crystal resonatorExpiredMar 24, 89Jul 09, 91[H01L]
5022130 Method of manufacturing crystal resonators having low acceleration sensitivityExpiredDec 26, 89Jun 11, 91[H01L]
4935658 Crystal resonator with low acceleration sensitivity and method of manufacture thereofExpiredJul 13, 88Jun 19, 90[H01L]
4837475 Crystal resonator with low acceleration sensitivity and method of manufacture thereofExpiredOct 02, 87Jun 06, 89[H01L]
4754646 Resonator pressure transducer structure and method of manufactureExpiredJan 30, 87Jul 05, 88[G01L]
4660420 AT-cut crystal resonator pressure transducerExpiredJul 22, 85Apr 28, 87[G01L, H01V]
4644796 Pressure measurement apparatus and methodExpiredDec 12, 85Feb 24, 87[G01L]
4644803 Force measurement apparatus and methodExpiredNov 13, 85Feb 24, 87[G01L, G01P, G01F]
4574639 Pressure force measurement apparatus and methodExpiredJun 21, 83Mar 11, 86[G01L, G01N]
4550610 Resonator pressure transducerExpiredNov 28, 83Nov 05, 85[G01L, H01V]
4535638 Resonator transducer system with temperature compensationExpiredOct 03, 83Aug 20, 85[G01L]
4526480 Fluid density temperature measurement apparatus and methodExpiredMay 29, 84Jul 02, 85[G01K]

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