Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4304846 | Method for processing silver dye-bleach materials | Gerald Jan | 1981-12-08 |
| 4254215 | Process for the prevention of darkening and the formation of a sediment in photographic developer solutions | Ekkehard Kramp, John Lenoir | 1981-03-03 |
| 4197123 | Process for the production of masked positive color images by the silver dye bleach process | Alfred Oetiker, Christoph Chylewski | 1980-04-08 |