Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6649798 | Method for production of diaminodiphenylmethanes | Stephan Klein, Dirk Grotjohann, Christine Mendoza-Frohn, Heinz Muller, Hans-Georg Pirkl +2 more | 2003-11-18 |
| 6639102 | Process for producing polyisocyanates of the diphenyl methane series having a reduced color value | Torsten Hagen, Friedhelm Kamper, Rudolf Uchdorf, Stefan Wershofen | 2003-10-28 |