Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4842388 | Single optical lense with diffraction limit converging capability and wide field angle | Yasuhiro Tanaka, Yoshitomi Nagaoka | 1989-06-27 |
| 4810076 | Selective shading device and an optical device using the same | Tsugio Murao, Yoshiharu Yamamoto, Kenichi Ikeda, Yoshitomi Nagaoka | 1989-03-07 |