Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6271414 | Process for the isomeric separation of isocyanates | Rudiger Drope, Hartmut Hetzel, Hans-Peter Schal, Gerhard Wegener | 2001-08-07 |
| 6156288 | Process for purifying and concentrating spent sulfuric acids | Heiko Beckhaus, Jurgen Munnig | 2000-12-05 |
| 6048508 | Process for obtaining carbon monoxide and hydrogen | Hans-Ulrich Dummersdorf, Hans-Joachim Muller, Gerhard Moormann | 2000-04-11 |
| 5817211 | Process and device for continuous evaporation to dryness of viscous solutions and suspensions with a tendency to stick | Clemens Casper, Hartmut Hetzel | 1998-10-06 |
| 5609735 | Process and a device for separating a solid residue from its solution in a stirred bed of material | Hartmut Hetzel, Wolfgang Ebner, Klaus Biskup | 1997-03-11 |
| 5563296 | Continuous process for preparing aromatic amines | Uwe J. Zarnack, Fritz Pohl, Hartmut Hetzel, Helmut Judat | 1996-10-08 |
| 5395995 | Process for the preparation and purification of nitroaromatics | Thomas Schieb, Gerhard Wiechers | 1995-03-07 |
| 4430156 | Process for drying pumpable suspensions | Clemens Casper, Gerd-Rudiger Klette, Edzard Tholema | 1984-02-07 |