Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7713387 | Method for separating trioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification | Markus Siegert, Neven Lang, Achim Stammer, Thorsten Friese, Hans Hasse | 2010-05-11 |
| 7544832 | Reaction column in a special combination with a natural circulation evaporator | Jan Bredehoft, Hans-Jurgen Pallasch, Ludwig E. Heck | 2009-06-09 |
| 7431804 | Method for carrying out the distillation or reactive distillation of a mixture containing at least one toxic constituent | Gerd Kaibel, Achim Stammer, Carsten Oost, Martin Sohn, Manfred Stroezel +1 more | 2008-10-07 |
| 7381851 | Method for producing formaldehyde | Gerhard Olbert, Thorsten Johann, Markus Weber, Neven Lang, Martin Fiene +1 more | 2008-06-03 |
| 7342139 | Method for producing highly concentrated formaldehyde solution | Bernd Rumpf, Ortmund Lang, Neven Lang | 2008-03-11 |
| 7230130 | Process for preparing methylenedianiline and methylenebis (phenylisocyanate) | Jan Jacobs, Wilfried Seyfert, Hans Volkmar Schwarz, Olaf Schweers, Volker Scharr +1 more | 2007-06-12 |
| 7193115 | Highly concentrated formaldehyde solution, production and reaction thereof | Martin Sohn, Hans Hasse, Klemens Schilling | 2007-03-20 |
| 7105078 | Method for producing an aqueous hydroxylamine solution devoid of salt | Karl-Heinz Wostbrock, Markus Weber, Steffen Kerth | 2006-09-12 |
| 7029557 | Method for producing an aqueous hydroxylamine solution devoid of salt | Karl-Heinz Wostbrock, Joachim Thiel, Heinz Krüger, Markus Weber, Bernd Gerber +3 more | 2006-04-18 |
| 6962682 | Fixed-bed process for producing chlorine by catalytic gas-phase oxidation of hydrogen chloride | Christian Walsdorff, Martin Fiene, Christoph Adami, Klaus Harth | 2005-11-08 |
| 6942762 | Method for the production of a salt-free aqueous hydroxylamine solution | Karl-Heinz Wostbrock, Joachim Thiel, Heinz Krüger, Markus Weber, Bernd Gerber +3 more | 2005-09-13 |
| 6916953 | Integrated process for preparing isocyanates | Christian Walsdorff, Martin Fiene, Klaus Harth, Jan Jacobs, Filip Deberdt | 2005-07-12 |
| 6831192 | Process for preparing methylenedianiline and methylenebis(phenyl isocyanate) | Jan Jacobs, Wilfried Seyfert, Hans Volkmar Schwarz, Olaf Schweers, Volker Scharr +1 more | 2004-12-14 |
| 6758990 | Stabilizing agent for hydroxylamine solutions | Markus Weber, Hans-Josef Sterzel, Otto Watzenberger | 2004-07-06 |
| 6673960 | Work-up of distillation residues from the synthesis of toluene diisocyanate | Hans Volkmar Schwarz, Markus Maurer, Michael Sander, Rene Leuthold, Burghard Hantel +2 more | 2004-01-06 |
| 6610888 | Reaction of a solution comprising a mixture | Stephan Scholl, Hans Hasse | 2003-08-26 |
| 6576788 | METHOD FOR PRODUCING MIXTURES CONSISTING OF DIPHENYLMETHANE DIISOCYANATES AND POLYPHENYLENE-POLYMETHYLENE-POLYISOCYANATES CONTAINING A REDUCED AMOUNT OF CHLORINATED SECONDARY PRODUCTS AND WITH A REDUCED IODINE COLOR INDEX | Ulrich Penzel, Volker Scharr, Dieter Starosta, Hilmar Boesel, Joachim Pfeffinger +8 more | 2003-06-10 |
| 6433219 | Method for the production of methylenedi(phenylamine and methylenedi(phenyl isocyanate) | Jan Jacobs, Wilfried Seyfert, Hans Volkmar Schwarz, Olaf Schweers, Volker Scharr +1 more | 2002-08-13 |
| 6350911 | Method for producing amines | Michael Sander, Ulrich Penzel, Hans Volkmar Schwarz, Dieter Stützer, Jörn Müller +5 more | 2002-02-26 |
| 6299734 | Preparation of an aqueous solution of free hydroxylamine | Otto Watzenberger, Peter Mauer, Heiner Schelling, Hans-Michael Schneider | 2001-10-09 |
| 6153799 | Method for producing highly pure aqueous hydroxylamine solutions | Otto Watzenberger, Heiner Schelling, Peter Pfab | 2000-11-28 |