Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6819642 | Data recording device, data reproducing device, and optical disc | Tetsuji Kawashima, Eiji Kumagai, Kenji Nagashima, Toshio Morizumi | 2004-11-16 |
| 6678226 | Data recording method and data recording apparatus | Yoshihiro Horibata, Norichika Mine | 2004-01-13 |