DOWTY COMMUNICATIONS, INC., A CORP. OF DE

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4956851 Modem with remote speed-change capabilityExpiredMay 25, 88Sep 11, 90[H04B]
4646305 High speed data modem using multilevel encodingExpiredSep 26, 83Feb 24, 87[H04L, G06F]
4573175 Variable digital frequency generator with value storageExpiredSep 12, 83Feb 25, 86[H03B]
4555667 Synchronous digital QPSK demodulator with carrier error correctionExpiredSep 26, 83Nov 26, 85[H03K, H03D]
4489416 Equalization system for modems in a polled arrangementExpiredMar 18, 83Dec 18, 84[H04B]
4355397 Full duplex communication system for voice grade channelsExpiredOct 15, 80Oct 19, 82[H04L]

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