Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855992 | Reversible optical recording medium with an optothermally deformable recording layer | Sumio Ikegawa, Akio Hori, Shinji Arai, Nobuaki Yasuda | 1989-08-08 |
| 4839861 | Information recording medium rewritable by utilizing two metastable phases of a recording layer and method using the same | Sumio Ikegawa, Shinji Arai, Sumio Ashida, Nobuaki Yasuda | 1989-06-13 |