Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866315 | Turn-on/off driving technique for insulated gate thyristor | Akio Nakagawa | 1989-09-12 |
| 4821083 | Thyristor drive system | Katsuhiko Takigami, Akio Nakagawa, Tomokazu Domon | 1989-04-11 |