Issued Patents 1997
Showing 1–1 of 1 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, Kenichi Nishiuchi, Shigeaki Furukawa, Nobuo Akahira, Kenichi Nagata +1 more | 1997-06-03 |