Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5766833 | Process of forming super high-contrast negative images and silver halide photographic material and developer being used therefor | Hiroaki Muratake, Haruhiko Kaji, Naoki Obi, Yasuhiko Kojima, Yasuo Shigemitsu | 1998-06-16 |
| 5683854 | Process of forming super high-contrast negative images and silver halide photographic material and developer being used therefor | Hiroaki Muratake, Haruhiko Kaji, Naoki Obi, Yasuhiko Kojima, Yasuo Shigemitsu | 1997-11-04 |
| 5460919 | Process of forming super high-contrast negative images and silver halide photographic material and developer being used therefor | Naoki Obi, Yasuhiko Kojima, Yasuo Shigemitsu, Jun Takeuchi | 1995-10-24 |
| 5372911 | Process of forming super high-contrast negative images and silver halide photographic material and developer being used therefor | Naoki Obi, Yasuhiko Kojima, Yasuo Shigemitsu, Jun Takeuchi | 1994-12-13 |
| 5362621 | Direct positive silver halide photographic material and method for forming high contrast positive image using the same | Naoki Obi, Yasuhiko Kojima, Masatoshi Katayama, Yasuo Shigemitsu | 1994-11-08 |
| 5284733 | High-contrast image forming process | Yasuhiko Kojima, Naoki Obi, Yasuo Shigemitsu | 1994-02-08 |