Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4843227 | Focus detecting apparatus with both passive and active focus capability | Toru Matsui | 1989-06-27 |
| 4798765 | Perpendicular magnetic recording medium | Yasuo Ishizaka, Noboru Watanabe, Eiichiro Imaoka | 1989-01-17 |