Issued Patents All Time
Showing 26–34 of 34 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5283772 | Optical head | Yoshio Yoshida, Yukio Kurata, Hideaki Sato | 1994-02-01 |
| 5283690 | Optical diffraction grating element | Yoshio Yoshida, Yukio Kurata | 1994-02-01 |
| 5279924 | Manufacturing method of optical diffraction grating element with serrated gratings having uniformly etched grooves | Keiji Sakai, Katsuhiro Kubo, Yukio Kurata, Yoshio Yoshida | 1994-01-18 |
| 5257131 | Polarization diffraction element and polarization detector employing the same | Yoshio Yoshida, Yasuo Nakata, Yukio Kurata | 1993-10-26 |
| 5253237 | Optical head device | Yoshio Yoshida, Yukio Kurata, Yasuo Nakata, Katsuhiro Kubo | 1993-10-12 |
| 5202869 | Optical head device including diffraction grating | Yoshio Yoshida, Yukio Kurata | 1993-04-13 |
| 5173890 | Optical pickup device including diffraction grating | Yoshio Yoshida, Yukio Kurata | 1992-12-22 |
| 5128914 | Optical pickup apparatus utilizing a diffraction device | Yukio Kurata, Yoshio Yoshida, Yasuo Nakata | 1992-07-07 |
| 5085496 | Optical element and optical pickup device comprising it | Yoshio Yoshida, Yasuo Nakata, Yukio Kurata, Nobuo Ogata, Tetsuo Ueyama +1 more | 1992-02-04 |