Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4847156 | Magnetic recording medium | Yasuo Nishikawa, Akihiro Matsufuji, Kenichi Masuyama | 1989-07-11 |
| 4844991 | Magnetic recording medium and process for the preparation of the same | Toshihiko Miura, Masaaki Fujiyama | 1989-07-04 |