Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6395105 | Phosphating process with a metalliferous re-rinsing stage | Winfried Wichelhaus, Helmut Endres, Horst-Dieter Speckmann, Jan-Willem Brouwer | 2002-05-28 |
| 6197126 | Nickel-free phosphating process | Wolf-Achim Roland, Matthias Hamacher, Jan-Willem Brouwer | 2001-03-06 |
| 6090224 | Phosphating process with a copper-containing re-rinsing stage | Winfried Wichelhaus, Helmut Endres, Horst-Dieter Speckmann, Jan-Willem Brouwer | 2000-07-18 |
| 5792283 | Nickel-free phosphating process | Wolf-Achim Roland, Karl-Dieter Brands, Jan-Willem Brouwer, Bernd Mayer | 1998-08-11 |
| 5391240 | Process for the passivating post-treatment of phosphatized metal surfaces | Reinhard Seidel, Karl-Dieter Brands | 1995-02-21 |
| 5312492 | Process not using chlorate or nitrite for the production of nickel and manganese containing zinc phosphate films | Joerg Riesop, Kurt Hosemann | 1994-05-17 |
| 5207840 | Process for preparing zinc phosphate coatings containing manganese and magnesium | Joerg Riesop, Wolf-Achim Roland | 1993-05-04 |
| 4968360 | Process for desludging phosphating baths and device for carrying out said process | Kurt Hosemann, Willi Wuest, Hubert Harth | 1990-11-06 |
| 4762572 | Process for phosphating electrolytically zinc-coated metals | Raschad Mady, Caecillie Daniel, Detlev Bohnhorst, Roland Morlock | 1988-08-09 |
| 4490185 | Phosphating solutions and process | Reinhard Opitz | 1984-12-25 |
| 4384900 | Method of treating metal surfaces prior to phosphatization | Hans Gotta | 1983-05-24 |