Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866697 | Information memory medium | Ryoji Yamaguchi, Nobuo Inage | 1989-09-12 |
| 4827468 | Information memory medium | Ryoji Yamaguchi, Nobuo Inage | 1989-05-02 |
| 4827470 | Information memory medium | Nobuo Inage | 1989-05-02 |