Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5665157 | Clean color shade, yellow-tinged red iron oxide pigments, and a process for their manufacture, and their use | Wolfgang Oehlert, Horst Brunn, Herbert Kunstmann | 1997-09-09 |