Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5684778 | Initialization process for a phase change recording medium with a zero level drop in flash light emission | Noboru Yamada, Katsumi Kawahara | 1997-11-04 |
| 5635267 | Optical information recording medium of phase change type having variably grooved tracks depending on their radial locations | Noboru Yamada, Kenichi Nishiuchi, Nobuo Akahira, Eiji Ohno, Kenichi Nagata +1 more | 1997-06-03 |