Patents per Year
Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5694197 | Corneal shape measuring apparatus | Hisashi Tsukada, Tsutomu Sato, Hideki Hatanaka, Takeyuki Kato | 1997-12-02 |
| 5668623 | Corneal shape measuring apparatus | Akio Sakurai, Takeyuki Kato | 1997-09-16 |
| 4591247 | Eye refractometer | Masayuki Masuyama, Ikuo Kitao, Shinji Wada, Kiwami Horiguchi | 1986-05-27 |
| 4261082 | Slide fastener for preventing jamming of foreign matter | — | 1981-04-14 |
| 4236284 | Solid slide fastener capable of effecting strong union | — | 1980-12-02 |
| 4203279 | Timepiece which permits freely adjusting the level of sounds produced therein and given out thereof | — | 1980-05-20 |