Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887143 | Semiconductor device | Tatsuo Okamoto | 1989-12-12 |
| 4845537 | Vertical type MOS transistor and method of formation thereof | Tadashi Nishimura, Kazuyuki Sugahara, Shigeru Kusunoki | 1989-07-04 |