Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8338644 | Method for the production of N,N-dimethylacetamide (DMAC) | Horst Grafmans, Steffen Maas, Alexander Weck, Heinz Ruetter, Michael Schulz | 2012-12-25 |
| 7309403 | Method for avoiding corrosion | Werner Reutemann, Theodor Weber, Manfred Julius | 2007-12-18 |
| 7227029 | Method for the continuous production of N-methyl-2-pyrrolidone (NMP) | Martin Rudloff, Peter Stops, Erhard Henkes, Helmut Schmidtke, Rolf Fischer +2 more | 2007-06-05 |
| 7164031 | Method for the production of 2-pyrrolidone | Martin Rudloff, Peter Stops, Erhard Henkes, Helmut Schmidtke, Rolf Fischer +2 more | 2007-01-16 |
| 6388137 | Method of purifying triethanolamine | Gunther Ruider | 2002-05-14 |
| 6348601 | Preparation of N-methyl-2-pyrrolidone (NMP) | Frank Ohlbach, Johann-Peter Melder, Martin Rudloff, Jörg Liebe | 2002-02-19 |
| 6323371 | Process for the preparation of alkanolamines having improved color quality | Gunther Ruider, Johann-Peter Melder, Gerhard Schulz, Frank Gutschoven, Philip Buskens | 2001-11-27 |
| 6291715 | Process for the preparation of alkanolamines having improved color quality | Gunther Ruider, Boris Breitscheidel, Heike Maier, Gerhard Schulz, Sylvia Huber | 2001-09-18 |
| 6153784 | Removal of halides from halide-containing nitrile mixtures | Heinz-Josef Kneuper, Hans-Jurgen Weyer, Horst Neuhauser, Johann-Peter Melder, Andreas Henne +1 more | 2000-11-28 |
| 6022999 | Preparation of 3-aminomethyl-3,5,5-trimethylcyclohexylamine having a cis/trans isomer ratio of at least 70:30 | Guido Voit, Tom Witzel, Boris Breitscheidel, Hermann Luyken, Peter Wahl | 2000-02-08 |
| 5874631 | Method and composition to increase the life of Liquid hydroxy-and alkoxyalkyl ketones | Ludwig Wambach, Harro Wache | 1999-02-23 |
| 5756845 | Preparation of 3-aminomethyl-3,5,5-trimethylcyclohexylamine | Guido Voit, Tom Witzel, Boris Breitscheidel, Wolfgang Harder, Hermann Luyken +2 more | 1998-05-26 |
| 5663444 | Preparation of a pure dialkylaminoethanol stable against discoloration | Johann-Peter Melder, Gunther Ruider, Tom Witzel, Gunter Boettger | 1997-09-02 |
| 4994603 | Preparation of methyl formate | Franz Mueller, Wolfgang Steiner, Otto Kratzer | 1991-02-19 |
| 4290960 | Preparation of 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one | Christian Dudeck, Walter Himmele, Rolf Lebkuecher, Wolfgang Sauer | 1981-09-22 |
| 4235823 | Preparation of diketones | Christian Dudeck, Gunter Lehmann, Werner Fliege, Norbert Petri, Hans Diem +2 more | 1980-11-25 |
| 4233246 | Manufacture of aliphatic hydroxycarbonyl compounds etherified with aliphatic groups | Christian Dudeck, Gunter Lehmann, Norbert Petri, Hans Diem, Werner Fliege +2 more | 1980-11-11 |
| 4229590 | Preparation of alkyl pyruvates | Christian Dudeck, Gunter Lehmann, Bernd Meissner, Hans Diem, Werner Fliege +1 more | 1980-10-21 |