Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881204 | Optical reading or writing apparatus | Hitoshi Imai, Kazuo Okada | 1989-11-14 |
| 4876666 | Wavelength selective optical data storage system | Hitoshi Imai, Kazuo Okada | 1989-10-24 |
| 4868807 | Wavelength selective optical data storage system | Kazuo Okada, Hitoshi Imai | 1989-09-19 |
| 4862442 | Focus detecting apparatus utilizing reflecting surface having variable reflectivity or transmissivity | Kazuo Okada, Hitoshi Imai | 1989-08-29 |
| 4841507 | Optical head for an optical recording and reproducing apparatus | Hitoshi Imai, Ryuichiro Arai, Kimiyuki Koyanagi | 1989-06-20 |