Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5696754 | Optical disk having a high-density recording layer and a low density recording layer | — | 1997-12-09 |
| 5617408 | Optical recording medium having a disc with deformed pits | Kanji Kayanuma | 1997-04-01 |