THORN EMI PATENTS LIMITED

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4952905 Data communication systemExpiredNov 29, 88Aug 28, 90[H04B]
4937569 Data communication systemExpiredJun 28, 88Jun 26, 90[H04Q]
4914674 Signal generatorExpiredMar 12, 86Apr 03, 90[H04B, H04K]
4868371 Heating assembly using tungsten-halogen lampsExpiredJan 12, 88Sep 19, 89[H05B]
4864104 Heating assembly using tungsten-halogen lampsExpiredJan 12, 88Sep 05, 89[H05B]
4843618 RadiographyExpiredApr 19, 83Jun 27, 89[H05G]
4816919 Automatic focussing system for an optical systemExpiredDec 03, 81Mar 28, 89[H04N]
4812170 Process for producing an inorganic foamExpiredAug 27, 87Mar 14, 89[C04B, C09D]
4792952 Signal receiverExpiredMay 20, 86Dec 20, 88[G06F]
4769828 RadiographyExpiredOct 17, 83Sep 06, 88[G01N]
4761529 Grilling or browning apparatus suitable for use in a microwave or convection ovenExpiredJun 19, 87Aug 02, 88[H05B]
4751370 Heating apparatusExpiredMay 11, 87Jun 14, 88[H05B]
4748666 Echo cancelling systemExpiredMay 22, 85May 31, 88[H04B]
4741922 Method of manufacturing a magnetic storage mediaExpiredJun 23, 86May 03, 88[H01F]
4740965 Asynchronous communications networkExpiredNov 27, 85Apr 26, 88[H04L, H04J]
4731123 Process for producing an inorganic foamExpiredOct 29, 85Mar 15, 88[C04B, C09D]
4707589 Heating apparatusExpiredNov 13, 86Nov 17, 87[H05B]
4702667 Compliant coupling mechanismExpiredJan 10, 86Oct 27, 87[B25J]
4687979 Control system for a robotic gripperExpiredJan 10, 86Aug 18, 87[G05B]
4680591 Helical antenna array with resonant cavity and impedance matching meansExpiredJun 27, 84Jul 14, 87[H01Q]

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