Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4489433 | Speech information transmission method and system | Akira Ichikawa | 1984-12-18 |
| 4473904 | Speech information transmission method and system | Akira Ichikawa | 1984-09-25 |
| 4340783 | Voice frequency response system | Tomonori Sugiyama | 1982-07-20 |