Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884126 | Semiconductor device having parallel-connected, self turn-off type semiconductor elements | Eiji Harada, Hitoshi Matsuzaki, Sigeo Tomita | 1989-11-28 |
| 4831288 | Direct parallel connection circuit of self-turn-off semiconductor elements | Sigeo Tomita, Kenji Koga | 1989-05-16 |