Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6813232 | Optical information recording/reproducing method and device therefor | Hironobu Shimizu, Atsuo Shimizu | 2004-11-02 |
| 6792613 | Optical information recording medium | Yoshikazu Takagishi, Atsuo Shimizu, Keiichi Ida, Mitsuo Sekiguchi, Isao Matsuda | 2004-09-14 |