Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5643650 | Magneto-optical recording medium | Yoshio Tawara, Katsushi Tokunaga, Yoshiaki Shimizu | 1997-07-01 |
| 5591502 | Magnetic recording medium | Katsushi Tokunaga, Yoshio Tawara | 1997-01-07 |