Thorn Emi Electronics Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6888492 RadarExpiredJan 15, 88May 03, 05[G01S]
5274582 Root square sum calculating apparatusExpiredJul 05, 91Dec 28, 93[G06G]
5068666 RadarExpiredJul 05, 89Nov 26, 91[G01S]
4982093 Thermal imaging deviceExpiredJan 11, 90Jan 01, 91[G01J]
4957046 ProjectileExpiredNov 22, 88Sep 18, 90[F42B]
4942402 Radiation absorber and method of making itExpiredOct 26, 88Jul 17, 90[H01Q]
4914380 Signal receiving arrangementExpiredDec 08, 88Apr 03, 90[G01R]
4877315 Optical deviceExpiredApr 19, 88Oct 31, 89[G02B]
4811665 Magnetic sensor arrangementExpiredMar 18, 87Mar 14, 89[F42C]
4811392 Communications networkExpiredDec 18, 86Mar 07, 89[H04L]
4797679 Radio direction-finding using time of arrival measurementsExpiredJun 09, 87Jan 10, 89[G01S]
4713652 Electrical apparatusExpiredNov 19, 85Dec 15, 87[G08B]
4691381 Receiver for amplitude modulated signalsExpiredApr 12, 85Sep 01, 87[H04B]
4628244 Electrical indicating circuitExpiredMar 26, 85Dec 09, 86[H02J]
4453136 AFC System for controlling an oscillator according to an input frequencyExpiredOct 13, 81Jun 05, 84[H03L]
4208709 RectifiersExpiredJul 03, 78Jun 17, 80[H02P]

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