Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859569 | Optical recording medium | Sumio Hirose, Hiroshi Ozawa, Kenji Abe, Shigeru Takahara, Tadashi Koike | 1989-08-22 |
| 4798781 | Fabrication process of optical recording medium | Sumio Hirose, Hiroshi Ozawa, Kenji Abe | 1989-01-17 |