Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6657946 | Phase change type optical disk having different reflectances at crystalline and amorphous states | — | 2003-12-02 |
| 6646978 | Optical storage medium with improved substrate structure to provide uniform signal quality | Tatsunori Ide | 2003-11-11 |