Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845024 | Hardeners for proteins, a binder layer hardened therewith and a photographic recording material containing such a layer | Wolfgang Himmelmann, Hans Ohlschlager, Karl-Wilhelm Schranz | 1989-07-04 |
| 4840890 | Hardened proteinic binder layer | Hans Ohlschlager, Karl-Wilhelm Schranz | 1989-06-20 |
| 4810625 | Photographic material with pyrazolone coupler and oil former | Klaus Wagner, Fritz Nittel | 1989-03-07 |