Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5182768 | Digital telephone set capable of being simultaneously used by a plurality of persons by using one transmission line | Yuji Nakano | 1993-01-26 |
| 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 telephones | Joseph W. Litterer, John E. Anderson, Gary William Mason, Minoru Shigematsu | 1988-04-26 |
| 4536619 | Ringing signal detection circuit | Kouichi Funabasama | 1985-08-20 |
| 4341927 | Data transmission apparatus | Tsuyoshi Shinoi | 1982-07-27 |
| 4185173 | Key telephone call signalling circuit | Stephen E. Kerman, Fumio Tsutsumi, Yuji Tanaka | 1980-01-22 |