Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862440 | Optical head with optical beam control using acoustic wave device | Norifumi Miyamoto, Yoshio Sato, Nobuyoshi Tsuboi, Hiroshi Sasaki, Hiroaki Koyanagi +1 more | 1989-08-29 |
| 4841514 | Optical recording method and apparatus using two fight spots | Nobuyoshi Tsuboi, Atsumi Watanabe, Yoshio Sato, Hiroshi Sasaki | 1989-06-20 |
| 4811328 | Optical recording and reproducing device | Tetsuo Ito, Hiroshi Sasaki, Yoshio Sato, Norifumi Miyamoto, Nobuyoshi Tsuboi +2 more | 1989-03-07 |