Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4753527 | Visual acuity testing apparatus | — | 1988-06-28 |
| 4408847 | Refractory power measuring device | Shinji Wada, Yoshinori Oana, Ikuo Kitao, Yasuo Kato | 1983-10-11 |
| 4306778 | Eye refractmeters using infrared rays | Shinji Wada, Ikuo Kitao, Yasuo Kato, Yuji Sugahara | 1981-12-22 |
| 4299455 | Vision testing instrument | Mitsugu Aoki, Yoshinori Oana, Yasuo Kato | 1981-11-10 |
| 4293199 | Apparatus for detecting astigmatic axes and measuring refractive powers | Shinzi Wada, Ikuo Kitao, Yoshinori Oana, Yasuo Kato | 1981-10-06 |
| 4277150 | Eye refractmeter | Shinzi Wada, Ikuo Kitao, Yasuo Kato | 1981-07-07 |
| 4192582 | Ophthalmometer | Mitsugu Aoki, Yoshikazu Konishi | 1980-03-11 |