Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6835435 | Stamper, mold system, recording medium substrate, recording medium, optical disc substrate, optical disc, and method for producing stamper | Yuuichi Kawaguchi, Kenji Yamaga, Hiroaki Takahata, Yoshimi Sakai | 2004-12-28 |
| 6815029 | Stamper, mold system, recording medium substrate, recording medium, optical disc substrate, optical disc, and method for producing stamper | Yuuichi Kawaguchi, Kenji Yamaga, Hiroaki Takahata, Yoshimi Sakai | 2004-11-09 |
| 6704274 | Optical recording disc | Hiroaki Takahata | 2004-03-09 |