Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889757 | Optical recording disk | Shinkichi Horigome, Toshio Niihara, Norio Ohta, Yutaka Sugita, Yoshinori Miyamura +2 more | 1989-12-26 |
| 4835027 | Optical disc | Ryoichi Sudo, Hiroaki Miwa, Shinkichi Horigome | 1989-05-30 |
| 4812346 | Optical disc base plate and process for producing the same | Ryoichi Sudo, Hiroaki Miwa | 1989-03-14 |