Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6805935 | Optical recording medium | Sumio Ashida, Keiichiro Yusu, Katsutaro Ichihara, Noritake Ohmachi | 2004-10-19 |
| 6800224 | Production process of optical disc and optical disc produced thereby | Yasuaki Ootera | 2004-10-05 |