Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6487015 | Diffraction grating having multiple gratings with different cycles for generating multiple beams and optical pickup using such diffraction grating | Kazuya Kitamura, Yukio Kurata, Takeshi Yamaguchi | 2002-11-26 |
| 6392965 | Optical pickup device | — | 2002-05-21 |