Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4849825 | Pick-up device for use in an optical information recording system | Yukio Kurata, Hideaki Sato, Yasuo Nakata, Nobuo Ogata | 1989-07-18 |
| 4812638 | Focusing error detector and optical data detecting device incorporating the focusing error detector | Nobuo Ogata, Yasuo Nakata, Hideaki Satou, Toshiyuki Tanaka, Etsuji Minami +2 more | 1989-03-14 |