Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5351230 | Optical information system focal point displacement detecting means having Fresnel zone plates with rectilinear grating | Hiroyuki Wada, Kenji Fukui, Ricardo Musashi Okamoto, Shohei Hashiguchi | 1994-09-27 |