Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877509 | Semiconductor wafer treating apparatus utilizing a plasma | Toshiaki Ogawa, Kenji Kawai, Teruo Shibano, Hiroshi Morita, Kyusaku Nishioka | 1989-10-31 |
| 4873162 | X-ray mask and a manufacture method therefor | Nobuyuki Yoshioka, Yaichirou Watakabe | 1989-10-10 |
| 4873493 | Audio amplifier | — | 1989-10-10 |