Issued Patents All Time
Showing 1–25 of 26 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6530987 | Method for producing iron oxide pigments from waste acid resulting from TiO2 production | Gerhard Auer, Ulrich Meisen, Werner Schuy, Udo Julius | 2003-03-11 |
| 6440377 | Method for reprocessing waste acid resulting from TiO2 production | Gerhard Auer, Ulrich Meisen, Werner Schuy | 2002-08-27 |
| 6416723 | Method for reprocessing waste acid to form gypsum and iron oxide | Gerhard Auer, Ulrich Meisen, Werner Schuy | 2002-07-09 |
| 6395165 | Process for preparing perfluorinated organic compounds by electrochemical fluorination | Andreas Bulan, Joachim Herzig | 2002-05-28 |
| 6251358 | Process for the preparation of sodium fluoride | Andreas Bulan, Gunter Buss | 2001-06-26 |
| 6106794 | Process for the preparation of sodium fluoride | Andreas Bulan, Gunter Buss | 2000-08-22 |
| 5837635 | Process for producing mixed oxide powders from deactivated denox catalysts | Jurgen Kischkewitz, Gunter Linde, Hans-Joachim Schittenhelm, Kai Butje | 1998-11-17 |
| 5271919 | Process for the thermal decomposition of metal sulphates | Rudolf Gerken | 1993-12-21 |
| 5229087 | Process for the preparation of titanium dioxide | Karl-Heinz Schultz, Rudolf Gerken | 1993-07-20 |
| 5122358 | Process for the purification of exhaust gases | Rudolf Gerken | 1992-06-16 |
| 5094834 | Process for the production of TiO.sub.2 pigments | Gerhard Wiederhoft | 1992-03-10 |
| 5061472 | Process for the concentration of sulphuric acid containing metal sulphates | Rudolf Gerken | 1991-10-29 |
| 4988495 | Process for the recorvery of sulphuric acid in the production of titanium dioxide | Gerhard Wiederhoft, Eckhard Bayer, Wolfgang Muller | 1991-01-29 |
| 4952387 | Process for separating metal sulphates from sulphuric acid | Rudolf Gerken, Wolfgang Rens | 1990-08-28 |
| 4931269 | Process for the purification and reheating of exhaust gases | Rudolf Gerken | 1990-06-05 |
| 4902485 | Process for the production of titanium dioxide pigments | Eckhard Bayer | 1990-02-20 |
| 4880446 | Process for heating up moist gases containing hydrogen halides | Wolfgang Dietz, Rudolf Gerken, Peter Clasen | 1989-11-14 |
| 4834954 | Process for cleaning flue gases | Karl-Heinz Dorr, Hugo Grimm, Heinz Neumann, Rudolf Gerken | 1989-05-30 |
| 4824655 | Process for the preparation of sulphur dioxide | Rudolf Gerken | 1989-04-25 |
| 4797163 | Process for the production of titanium dioxide pigments | Karl-Heinz Schultz | 1989-01-10 |
| 4772757 | Process for the production of nitrobenzene | Rudolf Gerken, Karl-Heinz Schultz, Rudolf Hornung, Walter Bockmann, Wolfgang Larbig +1 more | 1988-09-20 |
| 4731230 | Process for the preparation of TiCl.sub.4 | Walter Deissmann, Karl-Heinz Schultz | 1988-03-15 |
| 4670235 | Process for desulphurizing flue gases | Rudolf Gerken, Karl-Heinz Schultz | 1987-06-02 |
| 4663131 | Process for the preparation of titanium dioxide | Rudolf Gerken, Gerhard Wiederhoft, Walter Gutsche, Wolfgang Muller | 1987-05-05 |
| 4663490 | Process for the production of dinitrotoluene | Rudolf Gerken, Dieter Becher, Harro Witt | 1987-05-05 |