Issued Patents All Time
Showing 1–22 of 22 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6320652 | Optical measuring apparatus | Teruo Morimoto, Makoto Kamiya, Takashi Saika | 2001-11-20 |
| 5327210 | Light measurement device | Yoshihiro Okui, Taketoshi Kawamura, Shinji Shimizu, Mikio Uematsu, Hiroshi Furukawa +1 more | 1994-07-05 |
| 5122651 | Device for measuring luminance of fluourscent screen of cathode ray tube | Hiroshi Furukawa, Yoshihiro Okui | 1992-06-16 |
| 4994845 | Light measuring device | Yoshio Yuasa | 1991-02-19 |
| 4914468 | Light measuring device | Yoshio Yuasa | 1990-04-03 |
| 4857967 | Light source device | Hidetoshi Yasumoto | 1989-08-15 |
| 4821338 | Optical signal receiving apparatus with compensation for peripheral light | Akira Kataoka, Masayasu Hirano, Naoya Takata | 1989-04-11 |
| 4737815 | Photometer | Naoya Takata, Yoshihiko Azuma, Takehiro Katoh | 1988-04-12 |
| 4717861 | Electronic flash device | Yoshio Yuasa, Masahito Inaba | 1988-01-05 |
| 4704025 | Enlarger for use in photography | Yoshio Yuasa, Hidetoshi Yasumoto, Nobukazu Kawagoe, Masahito Inaba | 1987-11-03 |
| 4655576 | Light measuring device | Yoshio Yuasa, Masahito Inaba | 1987-04-07 |
| 4637721 | Light measuring device | Yoshio Yuasa | 1987-01-20 |
| 4608522 | Electronic flash device | Yoshio Yuasa, Masahito Inaba | 1986-08-26 |
| 4576470 | Enlarger for use in photography | Yoshio Yuasa, Hidetoshi Yasumoto, Nobukazu Kawagoe, Masahito Inaba | 1986-03-18 |
| 4575225 | Color enlarger | Yoshio Yuasa, Hidetoshi Yasumoto, Nobukazu Kawagoe, Masahito Inaba | 1986-03-11 |
| 4551011 | Light source for exposure | Yoshio Yuasa, Hidetoshi Yasumoto, Nobukazu Kawagoe, Masahito Inaba | 1985-11-05 |
| 4482978 | Key switch input control circuit | Yoshio Yuasa, Nobukazu Kawagoe | 1984-11-13 |
| 4469437 | Light measurement and light control data calculation device for a photographic enlarger | Yoshio Yuasa, Hidetoshi Yasumoto, Nobukazu Kawagoe, Masahito Inaba | 1984-09-04 |
| 4449822 | Exposure indicator | Yoshio Yuasa | 1984-05-22 |
| 4401386 | Light measuring device | Yoshio Yuasa | 1983-08-30 |
| 4397533 | Photographic light measuring device | Yoshio Yuasa, Norio Ishikawa | 1983-08-09 |
| 4397553 | Photographic spot measuring apparatus | Yoshio Yuasa | 1983-08-09 |