Nippon Tsu Shin Kogyo K.K.

Patent Applications and Registrations

Patent applications and USPTO patent grants for Nippon Tsu Shin Kogyo K.K..The latest application filed is for "key telephone call signalling circuit".

Company Profile

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Nippon Tsu Shin Kogyo K.K. - Kawasaki JP
Nippon Tsu Shin Kogyo K.K. - Kanagawa JA
Nippon Tsu Shin Kogyo K.K. - Stamford JA
Nippon Tsu Shin Kogyo K.K. - Kawasaki-shi JA

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Key telephone call signalling circuit Grant 4,185,173 - Kerman , et al. January 22, 1	1980-01-22
Pulse counting circuit Grant 4,087,649 - Kerman , et al. May 2, 1	1978-05-02
Key telephone intercom line system Grant 4,081,624 - Kerman , et al. March 28, 1	1978-03-28
Direct-station-selection intercommunication and automatic holding circuit in a key telephone system Grant 3,927,278 - Tsutsumi , et al. December 16, 1	1975-12-16
Off-premises station line circuit for a key telephone system Grant 3,920,902 - Matsuo , et al. November 18, 1	1975-11-18
Conference call circuit for use in a key telephone system Grant 3,909,552 - Kerman , et al. September 30, 1	1975-09-30
Handsfree loudspeaking key telephone set and a switching circuit for use in a microphone and loudspeaker equipped key telephone Grant 3,904,834 - Shinoi , et al. September 9, 1	1975-09-09
Automatic reset mechanism for push button telephone set Grant 3,903,070 - Kunimine , et al. September 2, 1	1975-09-02
Telephone call loudspeaker monitoring and relay control circuit Grant 3,881,069 - Ichikawa , et al. April 29, 1	1975-04-29
Switching apparatus for use in a paging system of a key telephone system Grant 3,872,261 - Shinoi , et al. March 18, 1	1975-03-18
Universal subscriber's line circuit in a key telephone system Grant 3,865,995 - Kerman , et al. February 11, 1	1975-02-11
Automatic Voice-path Switching Circuit For A Speaker Phone Telephone Set Grant 3,860,756 - Shinoi , et al. January 14, 1	1975-01-14

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