Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889757 | Optical recording disk | Shinkichi Horigome, Toshio Niihara, Norio Ohta, Yutaka Sugita, Ryoichi Sudo +2 more | 1989-12-26 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889757 | Optical recording disk | Shinkichi Horigome, Toshio Niihara, Norio Ohta, Yutaka Sugita, Ryoichi Sudo +2 more | 1989-12-26 |