Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6618116 | Optical head device and a diffraction element suitable for the device, and a method of manufacturing the diffraction element and the optical head device | Koichi Murata | 2003-09-09 |
| 6580674 | Phase shifter and optical head device mounted with the same | Takehiko Nishiyama, Naomitsu Umemura, Masahiro Murakawa, Yoshiharu Ooi, Yuzuru Tanabe | 2003-06-17 |