Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6829210 | Optical head and optical pickup | Kenji Yamamoto, Kiyoshi Osato | 2004-12-07 |
| 6674696 | Focus controlling apparatus and method, and optical disc drive | Isao Ichimura, Kenji Yamamoto, Kiyoshi Ohsato, Toshio Watanabe | 2004-01-06 |