Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6608281 | Laser beam machining head and laser beam machining apparatus having same | Takashi Ishide, Yoshio Hashimoto, Masao Watanabe, Takashi Akaba | 2003-08-19 |
| 6147815 | Imaging optical system | — | 2000-11-14 |
| 4775229 | Fresnel lens in a finder optical system | Yutaka Ichihara, Keiji Ohsawa | 1988-10-04 |
| 4770513 | Projection lens | Yoichi Umegaki | 1988-09-13 |
| 4768868 | Rear conversion lens | Koichi Wakamiya | 1988-09-06 |
| 4690517 | Retrofocus type wide angle lens | — | 1987-09-01 |
| 4396256 | Large aperture ratio, long focus lens | — | 1983-08-02 |