Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5068015 | Electrochemical process for the production of chromic acid | Hans-Dieter Block, Norbert Lonhoff, Helmut Klotz, Rainer Weber, Bernhard Spreckelmeyer | 1991-11-26 |
| 4919680 | High-extraction chrome tanning process | Bernhard Wehling, Heinz Klein, Gertrud A. Klein, Helga Rosentreter | 1990-04-24 |
| 4827022 | Process for the preparation of dimethylmaleate | Hans-Dieter Block | 1989-05-02 |