Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862309 | Protection circuit for battery feed circuit | Toshiro Tojo, Kenji Takato, Yuzo Yamamoto | 1989-08-29 |
| 4827503 | Integrated ringing circuit and a ring trip circuit for the same | Kenji Takato, Toshiro Tojo, Yuzo Yamamoto | 1989-05-02 |