Nippon Tsushin Kogyo Kabushiki Kaisha

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
D285681 Electronic intercommunication unitExpiredApr 29, 83Sep 16, 86[]
D283508 Key telephone setExpiredDec 01, 83Apr 22, 86[]
D282541 Main key telephone system casingExpiredJul 21, 83Feb 11, 86[]
D282067 Push buttonExpiredApr 29, 83Jan 07, 86[]
D281498 Push buttonExpiredApr 29, 83Nov 26, 85[]
D280617 Telephone setExpiredApr 29, 83Sep 17, 85[]
D280404 Telephone setExpiredApr 29, 83Sep 03, 85[]
D279896 Telephone handsetExpiredApr 29, 83Jul 30, 85[]
D279471 Electronic intercommunication unitExpiredApr 29, 83Jul 02, 85[]
4412102 Key telephone systemExpiredJul 01, 81Oct 25, 83[H04M, H04Q]
4347409 Key telephone systemExpiredAug 18, 80Aug 31, 82[H04Q]
4341927 Data transmission apparatusExpiredAug 11, 80Jul 27, 82[H04L]
4260857 Office line connection circuit during service interruptions in key telephone apparatusExpiredJan 30, 79Apr 07, 81[H04M, H04Q]
4185173 Key telephone call signalling circuitExpiredJul 18, 78Jan 22, 80[H04M]

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