Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5684874 | Ringtrip judging circuit | Tetsuo Yagyu, Takahiro Watai, Hirokazu Tanaka, Kunihiko Gotoh | 1997-11-04 |
| 5663673 | Output circuit having at least one external transistor | Hirokazu Tanaka, Tatsuo Kumano, Takahiro Watai | 1997-09-02 |