Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9487845 | Process for the acid digestion of metal-containing compounds | Thomas Heidenfelder, Helmut Witteler, Hans-Peter Seelmann-Eggebert | 2016-11-08 |
| 9034473 | Method for passivating a metallic surface with a basic composition | Achim Fessenbecker, Oihana Elizalde | 2015-05-19 |
| 8986467 | Method for passivating metallic surfaces with aqueous compositions comprising surfactants | Guido Vandermeulen, Achim Fessenbecker, Helmut Witteler, Jurgen Tropsch | 2015-03-24 |
| 8372216 | Continuous method for treating the surface of metal strips | Guido Vandermeulen, Bernd Strubel, Helmut Witteler, Jessica Neumann, Walter Bertkau +4 more | 2013-02-12 |
| 7097756 | Method for producing gold-colored surfaces pertaining to aluminum or aluminum alloys, by means of formulations containing silver salt | Werner Hesse | 2006-08-29 |