Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10143987 | Method for dividing fluid streams | Jeffrey Bolton, Friedhelm Steffens, Marc Seekamp, Gerhard Ruffert, Jürgen Kern +1 more | 2018-12-04 |
| 8153838 | Process for producing isocyanates | Andreas Bulan, Rainer Weber, Wolfgang Lorenz, Gerhard Moormann, Friedhelm Kamper | 2012-04-10 |
| 7555917 | Process for purification of anhydrous hydrogen chloride gas | Bill Brady, Guenther Weymans, Friedhelm Steffens | 2009-07-07 |
| 7442835 | Process and apparatus for the production of phosgene | Heinrich Lokum, Jurgen Munnig | 2008-10-28 |
| 7322565 | Stirring device and process for carrying out a gas-liquid reaction | Rainer Buse, Jurgen Munnig, Friedhelm Steffens, Joachim C. Ritter | 2008-01-29 |
| 7312362 | Process for the production of di- and polyamines of the diphenylmethane series | Richard Adamson, Rudolf Uchdorf, Fritz Pohl | 2007-12-25 |
| 7122701 | Process for preparing aromatic amines | Karl R. Sittkus, Claudia Mueller, Demetrios N. Zervoudis | 2006-10-17 |
| 7118653 | Process for the purification of mixtures of toluenediisocyanate incorporating a dividing-wall distillation column | Bill Brady, Friedhelm Steffens, Kai Verkerk, Gerhard Ruffert | 2006-10-10 |
| 7108770 | Process for the purification of toluene diisocyanate incorporating a dividing-wall distillation column for the final purification | Marcus Paul Grün, Bill Brady, Kai Verkerk, Hans-Peter Schal | 2006-09-19 |
| 6984762 | Process for the two-step production of dinitrotoluene | Erwin Dieterich, Anke Hielscher, Manfred Keller-Killewald, Jurgen Munnig, Dietmar Wastian | 2006-01-10 |
| 6953869 | Process for working up secondary components in the preparation of dinitrotoluene | Jurgen Munnig, Dietmar Wastian, Wolfgang Lorenz | 2005-10-11 |
| 6936741 | Process for working up the waste water obtained in the preparation of dinitrotoluene | Jurgen Munnig, Dietmar Wastian, Wolfgang Lorenz | 2005-08-30 |
| 6719957 | Process for purification of anhydrous hydrogen chloride gas | Bill Brady, Guenther Weymans, Friedhelm Steffens | 2004-04-13 |
| 6472564 | Process for the preparation of toluylene diisocyanate, specific mixtures of toluylene diamine and water, and the use of toluylene diamine and water mixtures to prepare toluylene diisocyanate | Klaus Biskup | 2002-10-29 |
| 6359177 | Process for separating mixtures of materials having different boiling points | Bill Brady, Guenther Weymans | 2002-03-19 |
| 5849947 | Process for the preparation of toluylene diisocyanate, specific mixtures of toluylene diamine and water, and the use of toluylene diamine and water mixtures to prepare toluylene diisocyanate | Klaus Biskup | 1998-12-15 |
| 4915509 | Mixer for mixing at least two free-flowing substances, especially those which react during mixing | Heinz Sauer, Hermann Dallmeyer, Uwe J. Zarnack, Bernd Weber | 1990-04-10 |
| 4851571 | Process for the production of isocyanates | Heinz Sauer, Hermann Dallmeyer, Uwe J. Zarnack, Bernd Weber | 1989-07-25 |
| 4774357 | Process for purifying polyisocyanates and the polyisocyanates thus purified | Franz-Moritz Richter, Gunther Ellendt, Marcel Petinaux | 1988-09-27 |
| 4745216 | Process for the production of polyisocyanates | Gunther Ellendt, Marcel Petinaux, Alfred Mitschker, Peter M. Lange | 1988-05-17 |
| 4597909 | Process for the production of polyisocyanates | Enno Mahlmann, Willi Eifler, Gunther Ellendt | 1986-07-01 |
| 4299755 | Non-aqueous dispersions of water-soluble polymers | Hans J. Rosenkranz | 1981-11-10 |
| 4211751 | Use of an apparatus for continuous photopolymerization | Eberhard Bandtel, Hans J. Rosenkranz | 1980-07-08 |