Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5359141 | Process for the production of polynuclear aromatic polyamines | Hartmut Knofel, Michael Brockelt, Rudolf Uchdorf, Hans-Peter Schal | 1994-10-25 |
| 5196591 | Process for the production of polynuclear aromatic polyamines | Hartmut Knofel, Michael Brockelt, Rudolf Uchdorf, Hans-Peter Schal | 1993-03-23 |
| 4924028 | Process for the production of polynuclear aromatic polyamines | Hartmut Knofel, Michael Brockelt, Rudolf Uchdorf | 1990-05-08 |
| 4914236 | Process for the preparation of multinuclear aromatic polyamines | Hartmut Knofel, Michael Brockelt, Rudolf Uchdorf | 1990-04-03 |
| 4774357 | Process for purifying polyisocyanates and the polyisocyanates thus purified | Berthold Keggenhoff, Franz-Moritz Richter, Gunther Ellendt | 1988-09-27 |
| 4745216 | Process for the production of polyisocyanates | Berthold Keggenhoff, Gunther Ellendt, Alfred Mitschker, Peter M. Lange | 1988-05-17 |
| 4405527 | Process for the preparation of polyisocyanates | Gerhard Wegener, Hartmut Knofel, Gunther Ellendt | 1983-09-20 |