Independent Broadcasting Authority

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4858005 System for encoding broadcast quality television signals to enable transmission as an embedded codeExpiredOct 14, 87Aug 15, 89[H04N]
RE33001 Digital television tape recordingExpiredJan 07, 88Jul 25, 89[H04N]
4851837 Method and apparatus for processing digital signals prior to recordingExpiredMay 12, 86Jul 25, 89[H03M]
4802215 Security system for television signal encryptionExpiredMar 15, 85Jan 31, 89[H04L, H04N]
4757531 Encryption of television signalsExpiredNov 20, 84Jul 12, 88[H04N]
4748496 Transmission and reception of television signals to produce extended definition picturesExpiredFeb 27, 85May 31, 88[H04N]
4748576 Pseudo-random binary sequence generatorsExpiredOct 01, 85May 31, 88[G06F]
4736422 Encrypted broadcast television systemExpiredFeb 22, 85Apr 05, 88[H04L, H04N]
4730217 Movement detector for use in television signal processingExpiredJun 12, 85Mar 08, 88[H04N]
4724486 Apparatus for deriving information signals for component television video signal receptionExpiredAug 10, 84Feb 09, 88[H04N]
4710815 Apparatus for improving the linearity of TV transmitters using a klystronExpiredFeb 05, 85Dec 01, 87[H04N, H04B]
4703358 Apparatus for processing a television signal including a movement detectorExpiredNov 15, 85Oct 27, 87[H04N]
4700216 Demodulator for color television signals including a sub-carrierExpiredSep 24, 85Oct 13, 87[H04N]
4700345 Downsampling and prefilter implementation in television systemsExpiredFeb 04, 85Oct 13, 87[H04N, H04J]
4697206 Method and apparatus for enhancing vertical chrominance resolutionExpiredFeb 27, 85Sep 29, 87[H04N]
4675722 Apparatus for deriving synchronization signals for component television video signal receptionExpiredAug 01, 84Jun 23, 87[H04N]
4661954 Error protection of linearly coded digital signalsExpiredDec 04, 84Apr 28, 87[G06F]
4658296 Dynamic noise reduction for videoExpiredOct 30, 84Apr 14, 87[H04N]
4654601 Demodulator for television signals with feedback to correlate frames or linesExpiredSep 17, 85Mar 31, 87[H03D]
4639764 MAC vertical synchronizing signalsExpiredMar 23, 84Jan 27, 87[H04N]

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