Nitsuko Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
D314374 Key telephone setExpiredOct 22, 86Feb 05, 91[]
D309726 Telephone handsetExpiredOct 22, 86Aug 07, 90[]
4935957 Key telephone systemExpiredJun 06, 89Jun 19, 90[H04M]
D304444 Point of sale terminalExpiredSep 05, 86Nov 07, 89[]
D301578 Telephone handsetExpiredOct 22, 86Jun 13, 89[]
4831516 Data transmission system between a main CPU board having a wait signal generating latch and a plurality of CPU boardsExpiredFeb 18, 86May 16, 89[G06F]
D301031 Key telephone setExpiredOct 22, 86May 09, 89[]
4802206 Calling system for enabling speech transmission from a caller to a called busy party in a telephone systemExpiredJul 16, 85Jan 31, 89[H04M]
4787083 Bus-method communication network system capable of seizing transmission right by using timer means at each stationExpiredSep 30, 87Nov 22, 88[H04Q]
4774501 Operator panel for a data input unitExpiredJun 25, 86Sep 27, 88[G06F]
D296784 Key telephone setExpiredJun 24, 86Jul 19, 88[]
D296785 Key telephone setExpiredJun 24, 86Jul 19, 88[]
D296550 Key telephone setExpiredJan 18, 85Jul 05, 88[]
D295514 Key telephone setExpiredJan 18, 85May 03, 88[]
4740955 Communications system having voice and digital data capability and employing a plurality of voice and data buses in main service unit and serial packetized transmission to and from telephonesExpiredOct 29, 86Apr 26, 88[H04Q]
4734936 Ringing signal sending-out circuitExpiredNov 14, 85Mar 29, 88[H04M]
D294499 Inter-call device for telephone setsExpiredJun 24, 86Mar 01, 88[]
D293676 Point-of-sale system terminal consoleExpiredFeb 08, 85Jan 12, 88[]
4682014 Simple data input apparatusExpiredJan 02, 86Jul 21, 87[G06F]
4660195 Channel detecting circuit in a receiver in a time-division multiplex transmission systemExpiredMar 25, 85Apr 21, 87[H04J]

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