Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6747939 | Semiconductor laser device and optical pickup device using the same | Yukio Saitoh, Naoki Nakanishi, Hideyuki Nakanishi | 2004-06-08 |
| 6735024 | Optical pickup with improved optical properties | Hideyuki Nakanishi, Shinichi Ijima, Akio Yoshikawa, Kazutoshi Onozawa, Kazuhiko Yamanaka +1 more | 2004-05-11 |
| 6728034 | Diffractive optical element that polarizes light and an optical pickup using the same | Hideyuki Nakanishi, Shinichi Ijima, Akio Yoshikawa, Teruhiro Shiono | 2004-04-27 |
| 6728035 | Optical device with diffraction grating having plural grating regions | Shinichi Ijima, Hideyuki Nakanishi, Akio Yoshikawa, Naoki Nakanishi | 2004-04-27 |