Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845720 | Semiconductor laser control circuit | Shinji Kubota, Kenzo Ishibashi | 1989-07-04 |
| 4800548 | Optical recording and reproducing apparatus with abnormality detector | Tamotsu Matsuo | 1989-01-24 |