Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5667759 | Method for manufacturing alkali chromates from chromium ore | Rainer Bellinghausen, Heinrich Helker, Paul Strehlow, Hans-Heinrich Moretto, Bernhard Spreckelmeyer +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 |
| 5273735 | Process for the preparation of sodium dichromate | Rainer Weber, Bernd Rosenow, Hans-Dieter Block | 1993-12-28 |
| 5250274 | Process for the production of sodium dichromate | Bernhard Spreckelmeyer, Hans-Dieter Block, Rainer Weber, Jost Halstenberg, Bernd Rosenow | 1993-10-05 |
| 5181994 | Process for the preparation of chromic acid | Ludwig Schmidt, Hans-Dieter Block, Rainer Weber | 1993-01-26 |
| 5127999 | Process for the preparation of alkali metal dichromates and chromic acid by electrolysis | Helmut Klotz, Rainer Weber, Hans-Dieter Block, Hans-Dieter Pinter | 1992-07-07 |
| 5128000 | Dimensionally stable anodes and their use in the preparation of alkali metal dichromates and chromic acid | Helmut Klotz, Rainer Weber, Hans-Dieter Block | 1992-07-07 |
| 5096548 | Process for the preparation of chromic acid | Ludwig Schmidt, Hans-Dieter Block, Rainer Weber | 1992-03-17 |
| 5094729 | Processes for the preparation of alkali metal dichromates and chromic acid | Helmut Klotz, Hans-Dieter Pinter, Rainer Weber, Hans-Dieter Block | 1992-03-10 |
| 5071522 | Process for the preparation of chromic acid | Helmut Klotz, Hans-Dieter Pinter, Rainer Weber, Hans-Dieter Block | 1991-12-10 |
| 5068015 | Electrochemical process for the production of chromic acid | Hans-Dieter Block, Bernd Makowka, Helmut Klotz, Rainer Weber, Bernhard Spreckelmeyer | 1991-11-26 |
| 5051155 | Processes for the preparation of alkali metal dichromates and chromic acid | Helmut Klotz, Hans-Dieter Pinter, Rainer Weber, Hans-Dieter Block | 1991-09-24 |
| 4981573 | Process for the production of alkali dichromates and chromic acid employing an anode of valve metal activated by electrodepositing noble metals from melts | Helmut Klotz, Rainer Weber, Hans-Dieter Block | 1991-01-01 |