ALCATEL NA NETWORK SYSTEMS CORP.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4750179 Selective prevention of bipolar violation detectionExpiredMay 02, 86Jun 07, 88[G06F]
4680750 Universal high-speed span line switchExpiredOct 01, 84Jul 14, 87[H04B, H04J]
4639910 Apparatus for establishing communication pathsExpiredDec 14, 84Jan 27, 87[H04G]
4602130 Dual voltage source feed circuit configuration for a telephone line circuitExpiredOct 15, 84Jul 22, 86[H04M]
4451917 Method and apparatus for pulse train synchronization in PCM transceiversExpiredJan 15, 81May 29, 84[H04J]
4424421 Apparatus for testing subscriber carrier systemsExpiredOct 23, 81Jan 03, 84[H04M]
4314368 Receiver for pulse code multiplexed signalsExpiredOct 12, 78Feb 02, 82[H04J]
4243930 Method and means for transmitting low speed signals over a PCM framing codeExpiredMay 23, 79Jan 06, 81[H04J]
4197427 Dual-processor line concentrator switching systemExpiredNov 11, 77Apr 08, 80[H04Q]
4196320 Method and means for powering telephone span linesExpiredJan 03, 78Apr 01, 80[H04B]
4196421 PCM encoder with variable set-up intervalsExpiredJan 03, 78Apr 01, 80[H03K]

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