Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6647097 | Telephone system for voice recognition | — | 2003-11-11 |
| 6144737 | Trunk interface circuit having function of battery feed to central office | Kenichi Maruyama | 2000-11-07 |
| 5216708 | Calling signal controller | Tetsuo Furukawa | 1993-06-01 |