Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5633844 | Optical pickup device with three beam tracking servo control using oval beams | Takanori Maeda | 1997-05-27 |
| 5627815 | Precision machining method precision machining apparatus and data storage apparatus using the same | Sumio Hosaka, Ryo Imura | 1997-05-06 |