Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5150173 | Method and apparatus for alignment and exposure | Kazuhito Isobe | 1992-09-22 |
| 4458325 | Calculator capable of calculating with additional externally instructed units | Shinichi Nakata, Hiroshi Takahashi, Shigeru Matsuyama | 1984-07-03 |
| 4421391 | Auto eye-refractometer | Isao Matsumura, Yasuyuki Ishikawa, Shigeo Maruyama, Yoshimi Kohayakawa | 1983-12-20 |
| 4376573 | Apparatus for measuring the refractive power of the eye | Isao Matsumura, Yasuyuki Ishikawa, Shigeo Maruyama, Yoshimi Kohayakawa | 1983-03-15 |
| 4372655 | Automatic eye-refractometer | Isao Matsumura, Yasuyuki Ishikawa, Shigeo Maruyama, Yoshimi Kohayakawa | 1983-02-08 |
| 4352161 | Electronic calculator capable of dealing with variables | Shinichi Nakata | 1982-09-28 |
| 4225932 | Instructional calculator | Koichi Mochizuki, Tokio Yasui, Jyoji Shimazu | 1980-09-30 |
| 4217656 | Electronic calculator | Koichi Mochizuki, Tokio Yasui, Jyoji Shimazu | 1980-08-12 |