Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11279809 | Phosphinate as flame-proofing additive for PUR/PIR hard foam material | Rolf Albach, Torsten Heinemann, Nicole Welsch | 2022-03-22 |
| 10982039 | PUR/PIR rigid foams made of polyaddition oligoesters | Hartmut Nefzger, Klaus Lorenz, Rene Abels | 2021-04-20 |
| 10633330 | Process for preparing liquid, storage-stable organic isocyanates having carbodiimide and/or uretonimine groups and having low colour number | Hans-Detlef Arntz, Ernst Felske | 2020-04-28 |
| 10526463 | Foam materials resistant to high temperatures | Florian Hupka, Wolfgang Friedrichs, Meike Niesten, Roland Helmut Krämer, Sindhu MENON | 2020-01-07 |
| 8394912 | Process and apparatus for the preparation of polycarbonate | Frank Doebert, Andreas Stremmel, Christoph Biedron, Stephan Laue, Johann Rechner +9 more | 2013-03-12 |
| 7745659 | Process for the production of liquid, storage-stable organic isocyanates with a low colour index having carbodiimide- and/or uretone imine groups | Stefan Wershofen, Manfred Schmidt, Hans-Georg Pirkl | 2010-06-29 |
| 7368595 | Process for the production of light-colored isocyanates | Stefan Wershofen, Christian Steffens, Jeffrey Bolton | 2008-05-06 |
| 7253321 | Process for the preparation of polyamines of the diphenylmethane series at a low degree of protonation | Daniel Koch, Hans-Georg Pirkl, Fritz Pohl, Stefan Wershofen, Rudolf Uchdorf +1 more | 2007-08-07 |
| 7205439 | Process for the preparation of di- and polyamines of the diphenylmethane series | Stefan Peter Grabowski, Richard Adamson, Daniel Koch, Stefan Wershofen | 2007-04-17 |
| 7041776 | Process for the production of polyisocyanates of the diphenylmethane series by phosgenation of non-neutralized polyamine of the diphenylmethane series | Daniel Koch, Hans-Georg Pirkl, Stefan Wershofen | 2006-05-09 |
| 6720455 | Process for the production of polyisocyanates of the diphenylmethane series with a reduced color value | Friedhelm Kamper, Daniel Koch, Heinz Muller | 2004-04-13 |
| 6639102 | Process for producing polyisocyanates of the diphenyl methane series having a reduced color value | Friedhelm Kamper, Daniel Koch, Rudolf Uchdorf, Stefan Wershofen | 2003-10-28 |