ABB INSTRUMENTATION INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5157973 Pressure sensor with integral overpressure protectionExpiredMar 16, 89Oct 27, 92[G01L]
4926698 Dual wedge flow elementExpiredMar 03, 89May 22, 90[G01F]
D289040 LoudspeakerExpiredDec 09, 83Mar 31, 87[]
4648066 Memory moduleExpiredMar 01, 84Mar 03, 87[G06F]
D287717 Front for an instrument panel for a controllerExpiredFeb 29, 84Jan 13, 87[]
D286396 Power supply heat sinkExpiredFeb 29, 84Oct 28, 86[]
4295376 Force responsive transducerExpiredDec 01, 78Oct 20, 81[G01L]
4291280 AC Generator system having stabilized sensitivity for sensing the presence or absence of a conductive objectExpiredNov 15, 78Sep 22, 81[G01R, G01V]
4275767 Fluid resistorExpiredOct 27, 76Jun 30, 81[F15C]
4262248 System for servicing process instrumentationExpiredNov 08, 78Apr 14, 81[G01R]
4254470 Interpolating digital data processing apparatus for correlation-type flow measurementExpiredAug 22, 78Mar 03, 81[G06F, G06G]
4237739 Integral flow metering assembly using a segmental wedgeExpiredMar 01, 79Dec 09, 80[G01F]
4218733 Adaptive gain controllerExpiredNov 13, 78Aug 19, 80[G05B, G06G]

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