Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5673241 | Focus detection mechanism and optical head and optical storage device that use it | Fumio Koyama, Masatoshi Yonekubo, Takashi Takeda, Toshio Arimura, Osamu Yokoyama | 1997-09-30 |