Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875203 | Tracking servo signal generating device for an optical disc | Yoshinari Takamura, Kazuaki Obara | 1989-10-17 |
| 4868820 | Method for illuminating adjoining slants of an optical disk having a V-shaped groove | Isao Satoh | 1989-09-19 |