AT&T and Philips Telecommunications B.V.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4920530 Adaptive time-discrete filter for forming a cancelling signal from synchronous data symbolsExpiredDec 15, 87Apr 24, 90[H04J]
4915651 Coaxial connectorExpiredOct 17, 88Apr 10, 90[H01R]
4873524 Decoding unit for CMI-encoded signalsExpiredMar 18, 88Oct 10, 89[H03M]
4849964 Multistage switching system for switching N1 input channels to N2 output channelsExpiredJan 07, 88Jul 18, 89[H04Q]
4825176 Control amplifierExpiredSep 23, 87Apr 25, 89[H03F, H03G]
4817081 Adaptive filter for producing an echo cancellation signal in a transceiver system for duplex digital communication through one single pair of conductorsExpiredMar 20, 87Mar 28, 89[H04B]
4811087 Clamping circuit for a television transmission systemExpiredFeb 02, 88Mar 07, 89[H04N]
4811335 Broadband/narrow-band switching network of the time-space-time type and time and space switching stages for broadband/narrow-band channelsExpiredMar 03, 87Mar 07, 89[H04Q]
4808810 Preamplifier for an optical receiverExpiredSep 23, 87Feb 28, 89[H01J]
4809263 T-type switching system for broadband switching system and time switching stage for use in a t-stageExpiredMar 03, 87Feb 28, 89[H04Q]
4797904 Transmitter for ISDN S-bus interface circuitExpiredMay 22, 87Jan 10, 89[H04L]
4796254 Broadband space switching network and parallel-series converter and series-parallel converter for use in such a space switching networkExpiredMar 03, 87Jan 03, 89[H04J]
4786884 Adaptive transversal filterExpiredMar 20, 87Nov 22, 88[H03H]
4772860 Phase-control loopExpiredJul 17, 87Sep 20, 88[H03L]
4759018 Higher order digital transmission system including a multiplexer and a demultiplexerExpiredJun 17, 86Jul 19, 88[H04J]
4754386 D.C. voltage converter with overload protectionExpiredMay 22, 87Jun 28, 88[H02M]
4746902 Arrangement for compensating for non-linear distortion in an input signal to be digitized and an echo cancelling system comprising such a arrangementExpiredMar 20, 87May 24, 88[H03M]

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