Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8110073 | Process for the preparation of aromatic amines | Bernd Pennemann, Rainer Buse | 2012-02-07 |
| 7575660 | Process for the distillative separation of aqueous amine solutions | Friedhelm Steffens, Rainer Buse | 2009-08-18 |
| 7555917 | Process for purification of anhydrous hydrogen chloride gas | Guenther Weymans, Berthold Keggenhoff, Friedhelm Steffens | 2009-07-07 |
| 7504533 | Process for the production of isocyanates | Matthias Böhm, Wolfgang Lorenz, Donald L. Pferdehirt | 2009-03-17 |
| 7307190 | Process for the preparation of toluenediamine | Bernd Pennemann, Rainer Buse, Gerd Greger | 2007-12-11 |
| 7118653 | Process for the purification of mixtures of toluenediisocyanate incorporating a dividing-wall distillation column | Friedhelm Steffens, Berthold Keggenhoff, 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, Berthold Keggenhoff, Kai Verkerk, Hans-Peter Schal | 2006-09-19 |
| 6719957 | Process for purification of anhydrous hydrogen chloride gas | Guenther Weymans, Berthold Keggenhoff, Friedhelm Steffens | 2004-04-13 |
| 6359177 | Process for separating mixtures of materials having different boiling points | Guenther Weymans, Berthold Keggenhoff | 2002-03-19 |
| 5457221 | Process for the manufacture of poly (hydrocarbylene aryl phosphate) compositions | Danielle A. Bright, Francis M. Schafer | 1995-10-10 |