Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4730306 | Conference system | — | 1988-03-08 |
| 4726016 | Conference system | Koichi Sekiguchi, Masaharu Kamigaki | 1988-02-16 |
| 4583221 | Synchronization system for key telephone system | Takao Ono | 1986-04-15 |
| 4479085 | Power source circuit | koichi Ashikaga | 1984-10-23 |