Telex Computer Products, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4783598 Optically coupled interface for portable semi-conductor data mediaExpiredSep 10, 86Nov 08, 88[B42D]
4743857 Digital/analog phase-locked oscillatorExpiredMar 13, 86May 10, 88[H03L]
4700909 Tape deck having improved tape pathExpiredSep 06, 83Oct 20, 87[G03B, G11B]
4700350 Multiple phase CRC generatorExpiredOct 07, 86Oct 13, 87[G06F]
4688113 Apparatus for calibrating tape drive read systemExpiredOct 01, 85Aug 18, 87[G11B]
4683507 Fixed/adjustable head mountExpiredJun 17, 85Jul 28, 87[G11B]
4674082 PBX telephone system I/O interfaceExpiredOct 31, 86Jun 16, 87[H04J]
4664327 Reel hub latchExpiredSep 13, 85May 12, 87[B05H]
4646322 Adaptive delta modulation codecExpiredDec 19, 83Feb 24, 87[H03M]
D284662 Hotel telephone faceplateExpiredDec 01, 83Jul 15, 86[]
D283423 Tape drive for use with a computerExpiredSep 06, 83Apr 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]
4415513 Method of manufacturing a composite foam tape transport capstanExpiredJan 15, 81Nov 15, 83[B29D]
4404680 Digital phase synchronizerExpiredNov 03, 80Sep 13, 83[H04L]
4390795 A.C. Power control for inductive loadsExpiredMay 26, 81Jun 28, 83[H02P, G05F]
4364678 Reinkable ribbon cartridgeExpiredJan 26, 81Dec 21, 82[B41J]
4327857 Low inertial capstan dampenerExpiredJun 02, 80May 04, 82[B65H]
4284250 Tape drive having an improved reel latchExpiredMar 13, 80Aug 18, 81[B65H]

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