Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4540253 | Method and device for measuring eye refraction errors | Hideyuki Ishiai, Yukiyasu Nishikawa, Masato Hara, Hirochika Aiura, Ikuzo Okamoto +1 more | 1985-09-10 |
| 4518859 | Angle measuring device with line sensor | — | 1985-05-21 |
| 4486080 | Device for detecting blinking of an eye under examination | Kiyoshi Itoh, Yukiyasu Nishikawa, Masato Hara, Hideyuki Ishiai, Ikuzo Okamoto +1 more | 1984-12-04 |
| 4432617 | Eye refractive error measuring device | Kiyoshi Itoh, Yukiyasu Nishikawa, Ikuzo Okamoto | 1984-02-21 |