Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888212 | Process for the preparation of magnetic recording medium | Shinobu Iida, Masaaki Fujiyama, Keisuke Yamada | 1989-12-19 |
| 4839225 | Magnetic recording medium | Akihiro Matsufuji | 1989-06-13 |
| 4828903 | Magnetic recording disk | Kiyomi Ejiri | 1989-05-09 |