Marconi Instruments Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5,526,473 Method of and apparatus for reducing the size of a display while substantially maintaining its information contentExpiredFeb 17, 95Jun 11, 96[G06T]
5,170,486 Apparatus for synthesizing a composite RF signal suitable for use as a test signal in testing adjacent channel rejection of radio receiversExpiredApr 02, 90Dec 08, 92[H04B]
5,061,909 Attenuator switchably coupled to transmission path and means for switchably breaking the pathExpiredApr 03, 89Oct 29, 91[H01P]
4,984,254 Frequency counterExpiredMar 07, 89Jan 08, 91[H04L]
4,955,826 ConnectorExpiredApr 12, 89Sep 11, 90[H01R]
4,914,405 Frequency synthesizerExpiredSep 01, 88Apr 03, 90[H03L]
4,868,512 Phase detectorExpiredJul 31, 87Sep 19, 89[H03K]
4,851,784 Phase comparatorsExpiredMar 18, 88Jul 25, 89[H03K]
4,810,960 Measuring adjacent channel powerExpiredJun 11, 87Mar 07, 89[G01R]
4,808,912 Six-port reflectometer test arrangement and method including calibrationExpiredDec 31, 86Feb 28, 89[G01N]
4,807,035 Signal measurementExpiredJul 13, 87Feb 21, 89[H04N]
4,795,970 Electrical apparatusExpiredMay 27, 87Jan 03, 89[G01R]
4,780,086 Electrical interface arrangementExpiredSep 23, 87Oct 25, 88[H01R]
4,777,429 Test arrangementExpiredOct 08, 87Oct 11, 88[G01R]
4,771,442 Electrical apparatusExpiredMay 27, 87Sep 13, 88[H04L]
4,769,592 Six-port reflectometer test arrangementExpiredDec 31, 86Sep 06, 88[G01R, G01N]
4,733,170 Microwave power sensorsExpiredMay 28, 86Mar 22, 88[G01R, H01P]
4,672,336 AttenuatorsExpiredMay 08, 85Jun 09, 87[H01P]
4,651,089 Frequency counting arrangementExpiredJan 17, 84Mar 17, 87[G01R]
4,573,756 Electrical interface arrangementsExpiredOct 20, 82Mar 04, 86[H01R]

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