Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6819642 | Data recording device, data reproducing device, and optical disc | Satoshi Kumai, Tetsuji Kawashima, Eiji Kumagai, Kenji Nagashima | 2004-11-16 |
| 6757227 | Optical drive apparatus for use with different recording media, tracking control method for use therein, and optical disc | Eiji Kumagai, Kenji Nagashima | 2004-06-29 |