Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6721259 | Optical head and recording/reproducing device | Kenji Yamamoto | 2004-04-13 |
| 6674696 | Focus controlling apparatus and method, and optical disc drive | Isao Ichimura, Fumisada Maeda, Kenji Yamamoto, Toshio Watanabe | 2004-01-06 |