Iwasaki Tsushinki Kabushiki Kaisha
Patent Owner
Stats
- 0 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- May 27, 1986 most recent publication
Details
- 0 Issued Patents
- 0 Issued in last 3 years
- 0 Published in last 3 years
- 187 Total Citation Count
- Dec 22, 1977 Earliest Filing
- 25 Expired/Abandoned/Withdrawn Patents
Patent Activity in the Last 10 Years
Technologies
- No Technology to Display
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Recent Publications
- No Recent Publications to Display
Recent Patents
- No Recent Patents to Display
Expired/Abandoned/Withdrawn Patents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]
4551583 Control signal transmission system for key telephone systemExpiredMar 08, 84Nov 05, 85[H04M, H04Q]
4502139 Howler tone sending-out system in time-division electronic exchangesExpiredJan 27, 82Feb 26, 85[H04J]
4450571 Two-way signal transmission and one-way DC power supply using a single line pairExpiredApr 22, 81May 22, 84[H04L]
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