Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5602809 | Optical system in a track-following servo system having an elliptical beam spot | — | 1997-02-11 |
| 5477521 | Prism for an optical pickup of an optical recording and reproducing device | — | 1995-12-19 |
| 5268894 | Apparatus for reproducing information by delaying and attenuating a reproducing signal | Yoichi Ogawa | 1993-12-07 |