Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7528283 | Process for preparing diamines and polyamines from the diphenylmethane series | Fritz Pohl, Jeffrey Bolton, Richard Adamson, Heinz Muller | 2009-05-05 |
| 7312362 | Process for the production of di- and polyamines of the diphenylmethane series | Berthold Keggenhoff, Richard Adamson, Fritz Pohl | 2007-12-25 |
| 7253321 | Process for the preparation of polyamines of the diphenylmethane series at a low degree of protonation | Torsten Hagen, Daniel Koch, Hans-Georg Pirkl, Fritz Pohl, Stefan Wershofen +1 more | 2007-08-07 |
| 6649798 | Method for production of diaminodiphenylmethanes | Stephan Klein, Dirk Grotjohann, Christine Mendoza-Frohn, Daniel Koch, Heinz Muller +2 more | 2003-11-18 |
| 6639102 | Process for producing polyisocyanates of the diphenyl methane series having a reduced color value | Torsten Hagen, Friedhelm Kamper, Daniel Koch, Stefan Wershofen | 2003-10-28 |
| 5359141 | Process for the production of polynuclear aromatic polyamines | Hartmut Knofel, Michael Brockelt, Marcel Petinaux, Hans-Peter Schal | 1994-10-25 |
| 5310769 | Process for the production of polyamine mixtures of the polyamino-polyaryl-polymethylene series | Christian König, Manfred Gallus, Reinhold Wullner, Franz-Moritz Richter, William C. Forester | 1994-05-10 |
| 5196591 | Process for the production of polynuclear aromatic polyamines | Hartmut Knofel, Michael Brockelt, Marcel Petinaux, Hans-Peter Schal | 1993-03-23 |
| 4924028 | Process for the production of polynuclear aromatic polyamines | Hartmut Knofel, Michael Brockelt, Marcel Petinaux | 1990-05-08 |
| 4914236 | Process for the preparation of multinuclear aromatic polyamines | Hartmut Knofel, Michael Brockelt, Marcel Petinaux | 1990-04-03 |
| 4853191 | Process for the removal of sulfur-containing gases | Wilhelm Bruening, Alfred Mitschker | 1989-08-01 |