Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5667759 | Method for manufacturing alkali chromates from chromium ore | Rainer Bellinghausen, Heinrich Helker, Paul Strehlow, Hans-Heinrich Moretto, Norbert Lonhoff +5 more | 1997-09-16 |
| 5505918 | Method for manufacturing alkali chromates from chromium ore | Uwe Arndt, Michael Batz, Rainer Bellinghausen, Hans-Dieter Block, Heinrich Helker +5 more | 1996-04-09 |
| 5250274 | Process for the production of sodium dichromate | Norbert Lonhoff, Hans-Dieter Block, Rainer Weber, Jost Halstenberg, Bernd Rosenow | 1993-10-05 |
| 5068015 | Electrochemical process for the production of chromic acid | Hans-Dieter Block, Norbert Lonhoff, Bernd Makowka, Helmut Klotz, Rainer Weber | 1991-11-26 |