Issued Patents 2004
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6822937 | Optical information medium | Takuya Tsukagoshi, Yoichi Nakayama | 2004-11-23 |
| 6775838 | Optical information medium and its testing method | Naoki Hayashida, Hideki Hirata | 2004-08-10 |
| 6731591 | Optical information medium | Naoki Hayashida | 2004-05-04 |
| 6689415 | Method and apparatus for preparing optical information medium | Hideki Hirata, Kenji Yamaga | 2004-02-10 |
| 6680899 | Optical information medium | Hideki Hirata, Naoki Hayashida, Toshifumi Tanaka | 2004-01-20 |