Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6649241 | Phase-change optical disk | — | 2003-11-18 |
| 6606293 | Optical information recording medium and methods for recording, reading, and erasing information thereupon | Mitsuya Okada, Masaki Itoh | 2003-08-12 |