Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6570828 | Optical pickup device having a movable-side member driven with a predetermined inclination | Akio Yamakawa, Yusaku Seki, Tetsuo Maeda, Yutaka Sugawara | 2003-05-27 |
| 6104688 | Objective lens, reproducing apparatus and reproducing method | Akio Yamakawa | 2000-08-15 |