Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853918 | Tracking servo uses tangent function to determine tracking error signal | Norio Nishida | 1989-08-01 |
| 4796250 | Optical recording and reproducing apparatus including a disc extraction area for power setting a laser | Kiyoshi Ohsato | 1989-01-03 |