Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4374914 | Process for the production of negative color images by the silver dye bleach process, and the silver dye bleach material used in this process | Dieter Wyrsch | 1983-02-22 |
| 4368256 | Process for production of masked positive color images by the silver dye bleach process and the silver dye bleach material used in this process | Dieter Wyrsch | 1983-01-11 |
| 4310617 | Process for the production of masked positive color images by the silver dye bleach process | Alfred Oetiker, Carlo Boragine | 1982-01-12 |