Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7672202 | Optical pickup apparatus | Tohru Hotta, Yoshio Hayashi, Kiyotaka Eizumi | 2010-03-02 |
| 5136565 | Optical device for reading and writing data on a recording medium | Chikashi Yoshinaga, Ryoichi Kawasaki | 1992-08-04 |
| 4767921 | Optical pickup device wherein the astigmatic converged beam spot is aligned along the dividing lines of the four-division photo-detector | Ryoichi Kawasaki, Masami Shimizu, Kouzou Suzuki | 1988-08-30 |