Piezo Electric Products, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4948927 Visco-elastic delayed actuator and systemExpiredOct 03, 88Aug 14, 90[H01H]
4791251 Delayed actuator with visco-elastic timerExpiredMay 26, 87Dec 13, 88[G04C, A01G, F22B, H01H]
4753579 Ultrasonic resonant deviceExpiredJul 10, 86Jun 28, 88[F04B]
4742189 Visco-elastic delayed actuatorExpiredDec 12, 86May 03, 88[G04C, A01G, H01H]
4702418 Aerosol dispenserExpiredSep 09, 85Oct 27, 87[B05B]
D291242 Refill for a fragrance dispenserExpiredMay 17, 85Aug 04, 87[]
4684328 Acoustic pumpExpiredJan 22, 86Aug 04, 87[F04B]
4615211 Pressure gauge for tires and other elastic vesselsExpiredDec 21, 84Oct 07, 86[G01L, B60C]
4595338 Non-vibrational oscillating blade piezoelectric blowerExpiredNov 17, 83Jun 17, 86[F01D]
4549115 Heat-sensitive variable-resistance light socket insert with resilient contactExpiredMar 30, 83Oct 22, 85[H01J, H05B]
4508994 Heat-sensitive variable-resistance light socket insertExpiredMar 30, 83Apr 02, 85[H05B]
4498851 Solid state blowerExpiredMar 22, 83Feb 12, 85[F04B]
4475823 Self-calibrating thermometerExpiredApr 09, 82Oct 09, 84[G01K]
4473859 Piezoelectric circuit breakerExpiredSep 22, 82Sep 25, 84[H01H, H02H]
4467236 Piezoelectric acousto-electric generatorExpiredJan 05, 81Aug 21, 84[H01L]
4461968 Piezoelectric relay with magnetic detentExpiredJan 11, 82Jul 24, 84[H01L]
4458171 Piezoelectric relay with tapered magnetic detentExpiredDec 15, 82Jul 03, 84[H01L]
4456394 Piezoelectric printer and asymmetric piezoelectric actuator used thereinExpiredMar 31, 82Jun 26, 84[H01L, B41J]
4420266 Piezoelectric printer and piezoelectric multilam actuator used thereinExpiredAug 23, 82Dec 13, 83[B41J]
4387318 Piezoelectric fluid-electric generatorExpiredJun 04, 81Jun 07, 83[H04R]

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