Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8568522 | Method of passivating metallic surfaces by means of copolymers having phosphoric acid and/or phosphonic acid groups | Frank Klippel, Gunnar Schornick, Dietrich Fehringer, Thomas Heidenfelder, Helmut Witteler +1 more | 2013-10-29 |
| 8563128 | Preparation for and method of applying corrosion control coats | Guido Vandermeulen, Konrad Roschmann, Gerhard Fischer, Helmut Witteler, Monica Fernandez Gonzalez | 2013-10-22 |
| 8420219 | Method for the application of corrosion-resistant layers to metallic surfaces | Guido Vandermeulen, Markus Hickl, Michael Dornbusch, Monica Fernandez Gonzalez, Konrad Roschmann +1 more | 2013-04-16 |
| 8241745 | Essentially chromium-free method for passivating metallic surfaces consisting of Zn, Zn alloys, Al or Al alloys | Frank Dietsche, Frank Klippel, Matthias Kluglein | 2012-08-14 |
| 7905964 | Method for the passivation of metal surfaces with compositions comprising polymers with acid groups and waxes | Helmut Witteler, Walter Bertkau, Thomas Heidenfelder | 2011-03-15 |
| 7749337 | Method for the passivation of metal surfaces with polymers containing acid groups | Helmut Witteler, Walter Bertkau, Thomas Heidenfelder, Jens Haas, Frank Klippel +1 more | 2010-07-06 |