Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5667579 | Thermally stable iron oxide pigments, a process for their preparation and their use | Friedrich Jonas, Gunter Buxbaum | 1997-09-16 |
| 5665157 | Clean color shade, yellow-tinged red iron oxide pigments, and a process for their manufacture, and their use | Wilfried Burow, Horst Brunn, Herbert Kunstmann | 1997-09-09 |