Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9896407 | Exhaust gas cleaning in a method for continuously producing dinitrotoluene | Thomas Knauf, Wolfgang Lorenz, Bernd Pennemann | 2018-02-20 |
| 9227909 | Method for the continuous production of nitrobenzene | Thomas Knauf, Joerg Schmiedler | 2016-01-05 |
| 8357827 | Process for the continuous preparation of nitrobenzene | Bernd Pennemann, Andreas Rausch | 2013-01-22 |
| 7442835 | Process and apparatus for the production of phosgene | Berthold Keggenhoff, Heinrich Lokum | 2008-10-28 |
| 7322565 | Stirring device and process for carrying out a gas-liquid reaction | Rainer Buse, Berthold Keggenhoff, Friedhelm Steffens, Joachim C. Ritter | 2008-01-29 |
| 6984762 | Process for the two-step production of dinitrotoluene | Erwin Dieterich, Anke Hielscher, Berthold Keggenhoff, Manfred Keller-Killewald, Dietmar Wastian | 2006-01-10 |
| 6953869 | Process for working up secondary components in the preparation of dinitrotoluene | Dietmar Wastian, Wolfgang Lorenz, Berthold Keggenhoff | 2005-10-11 |
| 6936741 | Process for working up the waste water obtained in the preparation of dinitrotoluene | Dietmar Wastian, Wolfgang Lorenz, Berthold Keggenhoff | 2005-08-30 |
| 6332949 | Method for upgrading used sulfuric acids | Heiko Beckhaus, Wolfgang Lorenz, Karl-Heinz Schumacher | 2001-12-25 |
| 6156288 | Process for purifying and concentrating spent sulfuric acids | Heiko Beckhaus, Dieter Grenner | 2000-12-05 |