Hughes Microelectronics Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5105449 Non-volatile counter employing memory cell groups and fault detection logicExpiredJul 17, 90Apr 14, 92[H03K, G06F]
5065366 Non-volatile RAM bit cellExpiredJul 17, 90Nov 12, 91[G11C]
5051956 Memory cell having means for maintaining the gate and substrate at the same potentialExpiredMar 23, 89Sep 24, 91[G11C]
5031145 Sense amplifierExpiredMar 29, 90Jul 09, 91[G11C]
4839909 Register access decade counting techniqueExpiredNov 13, 87Jun 13, 89[H03K, G11C]
4733482 EEPROM with metal doped insulatorExpiredApr 07, 87Mar 29, 88[H01L, G11C]
4730274 Non-volatile memory with predictable failure modes and method of data storage and retrievalExpiredFeb 24, 86Mar 08, 88[G11C]
4663770 Non-volatile counting circuit and method which provides for extended counter lifeExpiredFeb 24, 86May 05, 87[H03K]
4558432 Non-volatile semiconductor memory circuitsExpiredAug 24, 82Dec 10, 85[G11C]
4342101 Nonvolatile semiconductor memory circuitsExpiredOct 31, 80Jul 27, 82[G11C]
4284990 Position sensing transducerExpiredMar 03, 80Aug 18, 81[G08C]
4262644 Spark timing control circuit for controlling the timing of spark ignition of an internal combustion engineExpiredAug 03, 79Apr 21, 81[F02P]
4258355 Digital to analogue convertersExpiredAug 07, 78Mar 24, 81[H03K]
4213065 Device for providing a selectively variable proportion of an electrical signalExpiredMar 13, 78Jul 15, 80[H03K]
4191145 Vacuum sensorExpiredMay 19, 78Mar 04, 80[F02P]

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