Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5266442 | Method for increasing the contrast of photographic silver images | — | 1993-11-30 |
| 5236815 | Class of masked stabilizers in photographic materials or developing solutions | Jean-Marie Dewanckele, Marc Graindourze, Piet Kok | 1993-08-17 |
| 5206123 | High contrast developer containing an aprotic solvent | Piet Kok | 1993-04-27 |
| 5141843 | Developer liquid for high contrast development | Piet Kok, Jean-Marie Dewanckele | 1992-08-25 |
| 4756990 | Method of effecting high contrast development of an image-wise exposed photographic silver halide emulsion layer material | Robert J. Pollet | 1988-07-12 |
| 4710451 | High contrast development of silver halide emulsion material | — | 1987-12-01 |