Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6271414 | Process for the isomeric separation of isocyanates | Rudiger Drope, Dieter Grenner, Hans-Peter Schal, Gerhard Wegener | 2001-08-07 |
| 5817211 | Process and device for continuous evaporation to dryness of viscous solutions and suspensions with a tendency to stick | Clemens Casper, Dieter Grenner | 1998-10-06 |
| 5609735 | Process and a device for separating a solid residue from its solution in a stirred bed of material | Dieter Grenner, Wolfgang Ebner, Klaus Biskup | 1997-03-11 |
| 5563296 | Continuous process for preparing aromatic amines | Uwe J. Zarnack, Fritz Pohl, Dieter Grenner, Helmut Judat | 1996-10-08 |
| 5384034 | Candle precoated filter for residual volume filtration | — | 1995-01-24 |
| 4992171 | Filtering device with agitator | — | 1991-02-12 |
| 4482750 | Process for removing alkaline catalysts from polyether polyols | Pramod Gupta, Roland Nast, Herbert Echterhof, Ulrich Brocker | 1984-11-13 |
| 4399236 | Process for separating polyurethane hydrolyzates into polyether and diamine | Georg Niederdellmann, Norbert Roemer, Jurgen Schenk, Ernst Grigat | 1983-08-16 |
| 4241043 | Method for evaporating solvents and reacting components in compound mixtures | — | 1980-12-23 |