Issued Patents All Time
Showing 51–57 of 57 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4376573 | Apparatus for measuring the refractive power of the eye | Isao Matsumura, Yasuyuki Ishikawa, Shigeo Maruyama, Reiji Hirano | 1983-03-15 |
| 4372655 | Automatic eye-refractometer | Isao Matsumura, Yasuyuki Ishikawa, Shigeo Maruyama, Reiji Hirano | 1983-02-08 |
| 4293198 | Eye refractometer | Yasuyuki Ishikawa, Shigeo Maruyama | 1981-10-06 |
| 4257687 | Eye examining instrument with photo-detecting system | — | 1981-03-24 |
| 4252420 | Ophthalmoscopical apparatus provided with adjustment system | — | 1981-02-24 |
| 4198144 | Eye fundus camera | Isao Matsumura | 1980-04-15 |
| 4196979 | Method and device for detecting distance between eye-examining instrument and eye | Isao Matsumura | 1980-04-08 |