Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5719668 | Lens-meter for measuring optical characteristics of optical lens | Eiichi Yanagi | 1998-02-17 |
| 4810085 | Corneal configuration measuring apparatus | Yasufumi Fukuma, Akihiro Arai | 1989-03-07 |
| 4796989 | Opthalmological measuring apparatus | Yasufumi Fukuma, Akihiro Arai | 1989-01-10 |
| 4453808 | Apparatus for detecting the position of a patient's eye in ophthalmologic instruments | Susumu Takahashi, Yasuo Kato, Yoshiyuki Hatano | 1984-06-12 |
| 4408847 | Refractory power measuring device | Shinji Wada, Ikuo Kitao, Yasuo Kato, Taketoshi Ishihara | 1983-10-11 |
| 4371237 | Apparatus for measuring curvatures of a spherical surface | Kiichi Kamiyama | 1983-02-01 |
| 4299455 | Vision testing instrument | Mitsugu Aoki, Yasuo Kato, Taketoshi Ishihara | 1981-11-10 |
| 4293199 | Apparatus for detecting astigmatic axes and measuring refractive powers | Shinzi Wada, Ikuo Kitao, Yasuo Kato, Taketoshi Ishihara | 1981-10-06 |