MEMOREX TELEX CORPORATION, A CORP. OF DE.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
D315724 Cartridge tape subsystemExpiredOct 25, 88Mar 26, 91[]
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]
4688113 Apparatus for calibrating tape drive read systemExpiredOct 01, 85Aug 18, 87[G11B]
4683507 Fixed/adjustable head mountExpiredJun 17, 85Jul 28, 87[G11B]
4664327 Reel hub latchExpiredSep 13, 85May 12, 87[B05H]
D283423 Tape drive for use with a computerExpiredSep 06, 83Apr 15, 86[]
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]
4280646 Tape transport capstanExpiredMay 31, 79Jul 28, 81[B65H]
4279386 Compact pneumatic reel latchExpiredApr 14, 80Jul 21, 81[B65H]
4260849 Low cost grounding hanger assemblyExpiredMay 08, 79Apr 07, 81[H02B, H05K]
4260907 Power-on-reset circuit with power fail detectionExpiredJun 12, 79Apr 07, 81[H03K]
4250463 Overload protection to prevent saturation of video amplifiersExpiredAug 14, 78Feb 10, 81[H03F]
4241311 Digital majority noise filter for bi-level data receptionExpiredFeb 01, 79Dec 23, 80[H03K]

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