Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4810625 | Photographic material with pyrazolone coupler and oil former | Johannes Sobel, Fritz Nittel | 1989-03-07 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4810625 | Photographic material with pyrazolone coupler and oil former | Johannes Sobel, Fritz Nittel | 1989-03-07 |