Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5673248 | Phase change type optical recording apparatus and optical recording method using an overwrite system | Hiroshi Hasegawa | 1997-09-30 |
| 5673249 | Phase change type optical recording apparatus and optical recording method using an overwrite system | Hiroshi Hasegawa | 1997-09-30 |