Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5696757 | Optical disc, device for checking optical disc and device for recording information on optical disc | Kazuhisa Ozaki, Hirofumi Nagano | 1997-12-09 |
| 5617408 | Optical recording medium having a disc with deformed pits | Akira Nishizawa | 1997-04-01 |