Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5635267 | Optical information recording medium of phase change type having variably grooved tracks depending on their radial locations | Noboru Yamada, Shigeaki Furukawa, Nobuo Akahira, Eiji Ohno, Kenichi Nagata +1 more | 1997-06-03 |
| 5627816 | Multilayer optical disk and apparatus | Noboru Ito, Shinichi Tanaka, Sadao Mizuno | 1997-05-06 |