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, 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 | Yuuichi Kawaguchi, Hiroaki Takahata, Hisaji Oyake, Yoshimi Sakai | 2004-11-09 |
| 6689415 | Method and apparatus for preparing optical information medium | Tsuyoshi Komaki, Hideki Hirata | 2004-02-10 |