Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5617378 | Magneto-optical disc system having an objective lens with a numerical aperture related to the thickness of the protective layer | Tetsu Watanabe | 1997-04-01 |
| 5610880 | Optical disc system and optical disk therefor | Tetsu Watanabe | 1997-03-11 |