Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877677 | Wear-protected device | Kumiko Hirochi, Osamu Yamazaki | 1989-10-31 |
| 4844785 | Method for deposition of hard carbon film | Kiyotaka Wasa | 1989-07-04 |
| 4796982 | Optical valve | Kentaro Setsune, Kiyotaka Wasa | 1989-01-10 |