Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883710 | Magneto-optical recording medium | — | 1989-11-28 |
| 4839226 | Magneto-optical recording medium | Yasuo Sawada | 1989-06-13 |
| 4816292 | Method of preparing hexagonal ferrite element | — | 1989-03-28 |