SHARED TECHNOLOGIES FAIRCHILD TELECOM, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4674082 PBX telephone system I/O interfaceExpiredOct 31, 86Jun 16, 87[H04J]
4644535 PCM channel multiplexer/demultiplexerExpiredApr 26, 84Feb 17, 87[H04J]
4627046 Programmable feature cardExpiredApr 26, 84Dec 02, 86[H04M, H04Q]
4612634 Integrated digital network (IDN)ExpiredApr 26, 84Sep 16, 86[H04Q]
D284662 Hotel telephone faceplateExpiredDec 01, 83Jul 15, 86[]
4556970 PBX Telephone system remote synchronizationExpiredFeb 25, 85Dec 03, 85[H04Q, H04J]
4551832 Telephone based control systemExpiredDec 02, 83Nov 05, 85[H04Q]
4521879 Digital private branch exchangeExpiredAug 04, 81Jun 04, 85[H04M, H04Q]
4220823 Selectively controlled digital padExpiredJul 21, 78Sep 02, 80[H04M]

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