Issued Patents 2004
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6747939 | Semiconductor laser device and optical pickup device using the same | Yukio Saitoh, Shoichi Takasuka, Naoki Nakanishi | 2004-06-08 |
| 6735024 | Optical pickup with improved optical properties | Shoichi Takasuka, 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 | Shoichi Takasuka, Shinichi Ijima, Akio Yoshikawa, Teruhiro Shiono | 2004-04-27 |
| 6728035 | Optical device with diffraction grating having plural grating regions | Shoichi Takasuka, Shinichi Ijima, Akio Yoshikawa, Naoki Nakanishi | 2004-04-27 |
| 6680491 | Optical electronic apparatus and method for producing the same | Toru Tsuruta, Ryuma Hirano | 2004-01-20 |