Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6602342 | Crystal polymorphs of C.I. Pigment Yellow 191 and their preparation | Martin Schmidt, Arpad Acs, Rudiger Jung | 2003-08-05 |
| 4957841 | Specifically influencing the triboelectric effect of azo pigments | Hans-Tobias Macholdt, Alexander Sieber, Reinhold Deubel | 1990-09-18 |
| 4719292 | .beta.-modified crystalline red pigment | Reinhold Deubel, Norbert Wester | 1988-01-12 |