Iwasaki Tsushinki Kabushiki Kaisha

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4592046 Subscriber's circuit for time division switching systemExpiredApr 02, 84May 27, 86[H04M, H04Q, H04J]
4583214 Key telephone transmission systemExpiredMar 16, 84Apr 15, 86[H04L]
4583221 Synchronization system for key telephone systemExpiredOct 26, 83Apr 15, 86[H04J]
4558369 Facsimile connection systemExpiredDec 27, 83Dec 10, 85[H04N]
4551583 Control signal transmission system for key telephone systemExpiredMar 08, 84Nov 05, 85[H04M, H04Q]
4523289 Time interval measuring systemExpiredJan 17, 83Jun 11, 85[G01R]
4502138 Synchronization system for key telephone systemExpiredJul 30, 82Feb 26, 85[H04J]
4502139 Howler tone sending-out system in time-division electronic exchangesExpiredJan 27, 82Feb 26, 85[H04J]
4490820 Reception system for key telephone systemExpiredJul 30, 82Dec 25, 84[H04J]
4479085 Power source circuitExpiredDec 09, 81Oct 23, 84[G05F]
4450571 Two-way signal transmission and one-way DC power supply using a single line pairExpiredApr 22, 81May 22, 84[H04L]
4410767 Key telephone systemExpiredAug 16, 79Oct 18, 83[H04M, H04Q]
4399512 Waveform searching systemExpiredDec 17, 80Aug 16, 83[H01J]
4380690 Hybrid circuitExpiredJun 29, 81Apr 19, 83[H04B]
4367375 Push-button dial circuitExpiredSep 12, 80Jan 04, 83[H04M]
4353066 Channel switching networkExpiredNov 25, 80Oct 05, 82[H04Q]
4314109 Synchronization system for key telephone systemExpiredMay 20, 80Feb 02, 82[H04M, H04J]
4289399 Light signal observation deviceExpiredAug 10, 79Sep 15, 81[G01J]
4280022 Key telephone systemsExpiredJan 25, 79Jul 21, 81[H04Q]
4254306 Key telephone systemExpiredDec 06, 78Mar 03, 81[H04Q]

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