SIEMENS PLESSEY ELECTRONIC SYSTEMS LIMITED

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5107271 Target track assessmentExpiredNov 13, 87Apr 21, 92[G01S]
5021758 Circuit arrangement comprising MESFET switched spiral inductorExpiredDec 06, 88Jun 04, 91[H03H]
4969211 Transceiver interference cancellation systemExpiredMar 15, 88Nov 06, 90[H04B]
4939731 Data transmission system with automatic repeat requestExpiredSep 29, 88Jul 03, 90[G06F]
4890289 Fiber coupled diode pumped moving solid state laserExpiredDec 04, 87Dec 26, 89[H01S]
4886488 Glaucoma drainage the lacrimal system and methodExpiredAug 04, 88Dec 12, 89[A61M]
4878251 Interference signal suppressor for a radio receiverExpiredApr 25, 86Oct 31, 89[H04B]
4853658 Microwave phase shiftersExpiredJun 27, 88Aug 01, 89[H01P]
4849960 Optical fibre transducer injected data transmission systemExpiredJan 22, 87Jul 18, 89[H04B]
4815072 Switching arrangements for digital telecommunications exchange systemsExpiredMar 28, 86Mar 21, 89[H04J]
4811358 Subscriber line interface modemExpiredSep 10, 87Mar 07, 89[H04N]
4800342 Frequency synthesizer of the fractional typeExpiredNov 24, 86Jan 24, 89[H03L]
4789862 Analogue to digital convertersExpiredNov 24, 86Dec 06, 88[H03M]
4758802 Fractional N synthesizerExpiredNov 24, 86Jul 19, 88[H03L]
4754274 Microprocessor interface device for use in a telecommunications systemExpiredNov 27, 85Jun 28, 88[H04Q, H04J]
4737954 Subscriber line signalling device for use in a telecommunications systemExpiredNov 27, 85Apr 12, 88[H04J]
4731869 Target tracking transmitter having two levels of power operationExpiredFeb 18, 86Mar 15, 88[H03B]
4532520 Target detection systemsExpiredNov 16, 81Jul 30, 85[H01Q]
4486831 Multi-programming data processing system process suspensionExpiredSep 29, 80Dec 04, 84[G06F]
4395685 Waveguide junction for producing circularly polarized signalExpiredMay 01, 81Jul 26, 83[H01P]

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