Issued Patents 1994
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |