Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866692 | Method and apparatus for information recording and reproduction of a pit-shape-forming optical recording type | Atsushi Saito, Takeshi Maeda, Wasao Takasugi | 1989-09-12 |
| 4835759 | Method and apparatus for compensating variation of read data in an optical data storage | Atsushi Saito, Takeshi Maeda, Kazuo Shigematsu, Wasao Takasugi | 1989-05-30 |