Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4357280 | Use of tertiary phosphines in photographic silver dye bleach materials | Gerald Jan, Roland Kurzen, Max Meier, Matthias Schellenberg | 1982-11-02 |
| 4271254 | Process for producing photographic images | Leslie F. A. Mason, Robert Stanley Cook, David Kilcast, Matthias Schellenberg | 1981-06-02 |
| 4197123 | Process for the production of masked positive color images by the silver dye bleach process | Alfred Oetiker, Max Marthaler | 1980-04-08 |