Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8414698 | Pigment/auxiliary combination having improved colour properties | Holger Friedrich, Jurgen Kischkewitz | 2013-04-09 |
| 7931745 | Black pigment/auxiliary combination having improved colour strength | Holger Friedrich, Jurgen Kischkewitz | 2011-04-26 |
| 5389137 | Process for dyeing asphalt | Gunter Linde, Manfred Eitel, Peter Kresse, Gunther Teichmann | 1995-02-14 |