Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885189 | Method of producing magnetic recording media | Ryuji Shirahata | 1989-12-05 |
| 4876113 | Method for producing magnetic recording media | Koji Sasazawa | 1989-10-24 |
| 4873154 | Magnetic recording medium containing Fe, Co, N and O | Akio Yanai | 1989-10-10 |
| 4835068 | Magnetic recording medium | Yoshihiro Arai, Ryuji Shirahata | 1989-05-30 |
| 4801500 | Magnetic recording medium | Akio Yanai | 1989-01-31 |