Issued Patents All Time
Showing 26–35 of 35 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5733710 | Method for manufacturing a master die for a diffusion plate and diffusion plate manufactured by said method | Hiroshi Kuboya, Toshiharu Takahashi, Makoto Iki, Koichi Maruyama, Teruaki Hiyamuta +1 more | 1998-03-31 |
| 5719657 | Progressive power lens | Yasunori Izawa | 1998-02-17 |
| 5648652 | Optical focus evaluation and focus adjustment methods, focus evaluation and focus adjustment apparatus, and screen apparatus | Takaomi Sekiya | 1997-07-15 |
| 5353072 | Aspherical spectacle lens | Yasuyuki Tejima, Yasunori Izawa | 1994-10-04 |
| 5274406 | Image projecting device | Yasuyuki Tejima, Kazushi Yoshida | 1993-12-28 |
| 5085977 | Focusing screen and a method of forming a microstructure array for use with a focusing screen | Saburo Sugawara, Toshiharu Takahashi, Hideaki Yuda | 1992-02-04 |
| 5081545 | Focusing screen | Saburo Sugawara, Toshiharu Takahashi, Hideaki Yuda | 1992-01-14 |
| 4950057 | Progressive multi-focal ophthalmic lens | — | 1990-08-21 |
| 4637720 | Lens meter having a focusing indication system with divided-image registration focusing | Osamu Shindo, Hirochika Aiura, Tadao Hara | 1987-01-20 |
| 4469413 | Aspherical lens for indirect ophthalmoscope | — | 1984-09-04 |