Issued Patents 2004
Showing 1–2 of 2 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 | Kenji Yamaga, Hiroaki Takahata, Hisaji Oyake, Yoshimi Sakai | 2004-12-28 |
| 6815029 | Stamper, mold system, recording medium substrate, recording medium, optical disc substrate, optical disc, and method for producing stamper | Kenji Yamaga, Hiroaki Takahata, Hisaji Oyake, Yoshimi Sakai | 2004-11-09 |