Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4298631 | Method for smoothing both magnetic coat layers of magnetic recording medium | Fujio Shibata | 1981-11-03 |
| 4254864 | Protective jacket for plane magnetic recording medium | — | 1981-03-10 |