Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4835754 | Tracking control device of an optical pick-up | Kazutaka Yamamoto | 1989-05-30 |
| 4816722 | Digital phase-locked loop filter | — | 1989-03-28 |
| 4817069 | Tracking control system of an optical pick-up | — | 1989-03-28 |
| 4814679 | Motor speed control | — | 1989-03-21 |