Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4360581 | Color photographic recording material containing non-diffusing electron donor compounds | Heinrich Odenwalder, Hans Vetter, Wilhelmus Janssens | 1982-11-23 |
| 4277559 | Novel magenta-forming color couplers and their use in photography | Andre Verhecken | 1981-07-07 |
| 4273855 | Photographic diffusion transfer process and material for the production of color images and suitable compounds therefor | Andre Verhecken, Hans Vetter, Paul Marx | 1981-06-16 |