Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4851276 | Magnetic recording medium and method for producing the same | Shinichi Kitahata | 1989-07-25 |
| 4803132 | Magnetic recording medium | Tetsuya Nakazumi, Tomoji Kawai, Shichio Kawai | 1989-02-07 |