Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7294192 | Heat-stable zinc ferrite colour pigments, process for preparing them and their use | Carsten Rosenhahn, Wolfgang Oehlert | 2007-11-13 |
| 7144455 | Process for preparing yellow iron oxide pigments with CaCo3 precipitant | Ulrich Meisen, Karl-Heinz van Bonn, Holger Friedrich | 2006-12-05 |
| 5837051 | Process for the thermal treatment of iron oxides in a circulating fluidized bed | Jorg Krekel, Berndt-Ullrich Kohler | 1998-11-17 |
| 5665157 | Clean color shade, yellow-tinged red iron oxide pigments, and a process for their manufacture, and their use | Wolfgang Oehlert, Wilfried Burow, Herbert Kunstmann | 1997-09-09 |
| 5269843 | Boron-containing iron oxide pigments and a process for their preparation | Herbert Kunstmann, Gunter Buxbaum | 1993-12-14 |
| 5059250 | Red iron oxide pigments with improved coloring properties | Wilfried Burow, Peter Kresse, Hans Sander | 1991-10-22 |
| 5049193 | Heat stable iron oxide pigments of upsilon-Fe.sub.2 O.sub.3 structure, a process for their production and their use | Bernd Krockert, Gunter Buxbaum, Axel Westerhaus | 1991-09-17 |
| 4701221 | Process for the production of black pigments based on iron | Gerd-Hermann Schulten, Werner Fuhr | 1987-10-20 |
| 4698100 | Iron oxide yellow pigments having a low silking effect and a process for production thereof | Wilfried Burow, Helmut Printzen, Klaus Nollen | 1987-10-06 |
| 4620879 | Iron oxide yellow pigments having a low silking effect and a process for production thereof | Wilfried Burow, Helmut Printzen, Klaus Nollen | 1986-11-04 |
| 4589906 | Inorganic depot fertilizers | Johannes Niggemann, Peter Kohler, Franz Hund | 1986-05-20 |
| 4492600 | Corrosion-inhibiting paints and lacquers | Franz Hund, Wolfgang Rambold, Peter Kresse, Gerd von Szadkowski | 1985-01-08 |
| 4443264 | Halogen-free zinc ferrite yellow pigments containing alumina and phosphorus oxide and production | Franz Hund, Willi Hennings, Peter Kresse, Wolfgang Rambold | 1984-04-17 |
| 4358431 | Production of magnetic iron oxides | Peter Kiemle, Franz Hund, Heribert Bade | 1982-11-09 |
| 4234348 | Process for the production of iron oxide red pigments | Heribert Bade, Franz Hund | 1980-11-18 |