GTE Business Communication Systems Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4614842 Secretarial telephone station with distributed processing for use with a secretarial answering systemExpiredOct 11, 83Sep 30, 86[H04M]
D284807 Belt holster for telephone instrumentExpiredFeb 08, 84Jul 29, 86[]
4603236 Secretarial answering system with distributed processingExpiredOct 11, 83Jul 29, 86[H04M]
4591666 Protection circuitry for subscriber's telephone circuit equipped with repertory memoryExpiredDec 05, 83May 27, 86[H04M]
4581694 Inverter using parallel connected series pre-regulator and a synchronized switchExpiredJul 05, 84Apr 08, 86[H02M]
D282927 Telephone instrumentExpiredSep 16, 83Mar 11, 86[]
4574165 Secretarial answering systemExpiredOct 11, 83Mar 04, 86[H04M]
4567324 Secretarial telephone station for use with a secretarial answering systemExpiredOct 11, 83Jan 28, 86[H04M]
4555597 Transient resistant key operated pulse generating calling device circuitExpiredDec 05, 83Nov 26, 85[H04M]
D280506 Modular telephone dialer unitExpiredMay 02, 83Sep 10, 85[]
D280403 Modular loudspeaking telephone unitExpiredMay 02, 83Sep 03, 85[]
D280405 Modular telephone base unitExpiredMay 02, 83Sep 03, 85[]
4536620 Master unlock circuit for an electronic telephoneExpiredDec 12, 83Aug 20, 85[H04M]
4532382 Power supply for telephone equipment memory devicesExpiredJan 30, 84Jul 30, 85[H04M]
D279776 Modular telephone base unitExpiredMay 02, 83Jul 23, 85[]
4529843 Subscribers telephone hold circuit with automatic disconnectExpiredAug 25, 83Jul 16, 85[H04M]
4527016 Current regulated pulse dialer with memory retention circuitExpiredAug 25, 83Jul 02, 85[H04M]
4523057 High gain cascode amplifier with negative feedbackExpiredApr 02, 84Jun 11, 85[H04N]
4517414 Hookswitch bounce resistant telephone hold-mute circuitExpiredDec 12, 83May 14, 85[H04M]
4492823 Dual timing circuit for telephone subscriber's instrumentExpiredMay 02, 83Jan 08, 85[H04M]

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