TDK SEMICONDUCTOR CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5564061 Reconfigurable architecture for multi-protocol data communications having selection means and a plurality of register setsExpiredFeb 25, 94Oct 08, 96[G06F]
5561826 Configurable architecture for serial communicationExpiredSep 11, 95Oct 01, 96[G06F]
5434800 Programmable system for the synchronization of an electronic angular position indicatorExpiredAug 08, 94Jul 18, 95[G01B]
5397978 Current limit circuit for IGBT spark drive applicationsExpiredAug 03, 92Mar 14, 95[G05F]
5317614 Programmable electronic angular position indicator based upon engineering unitsExpiredAug 26, 92May 31, 94[G07C]
4953186 Phase jitter trackerExpiredFeb 19, 88Aug 28, 90[H04B]
4870370 Method and apparatus for two stage automatic gain controlExpiredFeb 19, 88Sep 26, 89[H03G]
4866739 Digital fast recovery timing algorithmExpiredFeb 22, 88Sep 12, 89[H04L]
4847868 Non-coherent pattern detectionExpiredFeb 22, 88Jul 11, 89[H03K, H04L]
4789995 Synchronous timer anti-alias filter and gain stageExpiredMay 01, 87Dec 06, 88[H04L]
4777453 Quadrature amplitude modulator using switched capacitor filterExpiredMay 01, 87Oct 11, 88[H04L]
4742251 Precise call progress detectorExpiredAug 12, 85May 03, 88[H03K]
4691172 MOS Switched capacitor automatic gain control circuitExpiredSep 10, 85Sep 01, 87[H03G]

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