Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868102 | Direct positive silver halide light-sensitive photographic material | Keiji Ogi, Eiichi Sakamoto, Nariko Isozaki | 1989-09-19 |
| 4749644 | Photographic material with two size population of silver halide grains and development inhibiting agent in an emulsion layer | Yasuo Tosaka, Keiji Ogi | 1988-06-07 |
| 4433049 | Method for preparing a light-sensitive cuprous halide emulsion | Noboru Itoh, Toshiaki Takahashi, Keiji Ogi | 1984-02-21 |