Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889757 | Optical recording disk | Shinkichi Horigome, Toshio Niihara, Norio Ohta, Yoshinori Miyamura, Ryoichi Sudo +2 more | 1989-12-26 |
| 4880694 | Magneto-optical recording material | Shinji Takayama, Toshio Niihara, Katsuhiro Kaneko | 1989-11-14 |
| 4838962 | Magneto-optical recording medium | Shinji Takayama, Fumiyoshi Kirino | 1989-06-13 |