Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5680384 | Laser emission unit, optical head and optical memory device | Hideya Seki, Masatoshi Yonekubo, Toshio Arimura | 1997-10-21 |
| 5673241 | Focus detection mechanism and optical head and optical storage device that use it | Fumio Koyama, Masatoshi Yonekubo, Toshio Arimura, Hidefumi Sakata, Osamu Yokoyama | 1997-09-30 |