Questech Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6239846 Digital video effects, apparatus and methodExpiredApr 03, 98May 29, 01[H04N]
5822015 Providing an accurate tally indication of sources in use for outputExpiredNov 28, 95Oct 13, 98[H04N]
5663868 Stackable electronic equipment assembly with improved circuit board cooling arrangementExpiredSep 14, 95Sep 02, 97[H05K]
5524091 Accurate digital dividerExpiredJun 21, 94Jun 04, 96[G06F]
5293233 Digital video effects with image mapping on to curved surfaceExpiredJul 10, 92Mar 08, 94[H04N, G06F]
5227884 Processing of video image signalsExpiredAug 27, 91Jul 13, 93[H04N]
5220428 Digital video effects apparatus for image transpositionExpiredMay 03, 91Jun 15, 93[H04N]
5153726 Recording and editing of moving television picturesExpiredAug 18, 89Oct 06, 92[H04N]
5132561 Switching of logic data signalsExpiredJan 15, 91Jul 21, 92[H03K]
5067133 Error-correction of stored television signalsExpiredAug 18, 89Nov 19, 91[H04N, G06F]
4922345 Processing of video image signalsExpiredJan 26, 88May 01, 90[H04N]
4918530 Processing of video image signalsExpiredAug 25, 89Apr 17, 90[H04N]
4879597 Processing of video image signalsExpiredJan 26, 88Nov 07, 89[H04N]
4847691 Processing of video image signalsExpiredJan 26, 88Jul 11, 89[H04N]

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