Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6576788 | METHOD FOR PRODUCING MIXTURES CONSISTING OF DIPHENYLMETHANE DIISOCYANATES AND POLYPHENYLENE-POLYMETHYLENE-POLYISOCYANATES CONTAINING A REDUCED AMOUNT OF CHLORINATED SECONDARY PRODUCTS AND WITH A REDUCED IODINE COLOR INDEX | Ulrich Penzel, Volker Scharr, Dieter Starosta, Hilmar Boesel, Eckhard Ströfer +8 more | 2003-06-10 |
| 6229043 | Preparation of mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates having a reduced iodine color number and a reduced chlorine content | Dietrich Scherzer, Bernd Bruchmann, Roland Minges, Peter Keller, Wolfgang Heider +4 more | 2001-05-08 |
| 5207942 | Preparation of mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates having a reduced iodine color number | Dietrich Scherzer, Roland Minges, Werner Langer, Bernd Bruchmann, Wolfgang Heider +2 more | 1993-05-04 |
| 5208368 | Preparation of mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates of reduced iodine color number | Dietrich Scherzer, Roland Minges, Bernd Bruchmann, Wolfgang Heider, Peter Keller | 1993-05-04 |
| 4294666 | Process for the manufacture of 4,4'-diphenyl-methane diisocyanate and a mixture of diphenyl-methane diisocyanate isomers containing a small amount of uretdiones and hydrolyzable chlorine | Hans J. Astheimer, Horst Brandtstaedter, Rainer Ohlinger, Jaak Van Steen, Friedrich Sauer +2 more | 1981-10-13 |