PLESSEY OVERSEAS LIMITED

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5200650 High frequency master/slave flip-flopsExpiredNov 21, 90Apr 06, 93[H03K]
5095514 Fibre optic sensorExpiredAug 14, 89Mar 10, 92[G02B]
5080931 Doped polymer films for waveguidesExpiredApr 25, 88Jan 14, 92[B05D]
5060027 Light emitting diode array with aligned solder bumpsExpiredMay 15, 90Oct 22, 91[H01L]
5050194 High speed asynchronous data interfaceExpiredMar 14, 90Sep 17, 91[H04L]
5022012 Acoustic sensing arrangementsExpiredMar 30, 90Jun 04, 91[H04B]
4970634 Radar transparent materialsExpiredMay 25, 89Nov 13, 90[F21V]
4964199 Securing arrangementExpiredAug 28, 89Oct 23, 90[B63B, A44B]
4943959 Data packet switchingExpiredFeb 10, 89Jul 24, 90[H04J]
4942113 Contrast enhanced photolithographyExpiredMar 06, 89Jul 17, 90[G03C]
4887314 Optical FSK demodulatorExpiredFeb 16, 89Dec 12, 89[H04B]
4883410 Fuel supply systemsExpiredJan 17, 89Nov 28, 89[F04C]
4877747 Optical assay: method and apparatusExpiredApr 04, 86Oct 31, 89[G01N]
4834511 Optical resonant assemblyExpiredAug 05, 86May 30, 89[G02B, H01S, G02F]
4826977 Photochromic spiropyran compoundsExpiredMay 15, 87May 02, 89[C07D, G03C, G02B]
4818050 Optical switch arraysExpiredOct 29, 87Apr 04, 89[G02B]
4818096 Photoreactive lenses with adamantane spiro compoundsExpiredJun 17, 87Apr 04, 89[C07D, G02B, G03C]
D298132 Telephone base with keyboard dialing means and visual displayExpiredJul 24, 85Oct 18, 88[]
4773728 Method for optical fibre splice protectionExpiredJun 20, 86Sep 27, 88[G02B]
4760313 Cathode ray tube display systemsExpiredSep 16, 87Jul 26, 88[H01J]

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