Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4481253 | Process for preparing ferromagnetic metal powder and a magnetic recording medium including the powder | Akihiro Matsufuji, Shizuo Umemura, Akira Kasuga, Goro Akashi | 1984-11-06 |
| 4465737 | Magnetic recording medium | Akira Kasuga, Akihiro Matsufuji, Tsutomu Sugisaki | 1984-08-14 |
| 4455345 | Magnetic recording medium | Akira Kasuga | 1984-06-19 |