Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868098 | Method of processing exposed photographic silver dye bleach materials comprising heating after processing liquid application | Urs Furholz | 1989-09-19 |
| 4803151 | Photographic material for the silver dye bleach process comprising an AZO dye, capable of laking, in gelatine | Matthias Schellenberg | 1989-02-07 |