Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6669740 | Dye preparations comprising azo dyes | Karl Siemensmeyer, Bernd Siegel, Volker Bach, Manfred Herrmann, Rudiger Sens | 2003-12-30 |
| 6537331 | Dye preparations containing azo dyes | Karl Siemensmeyer, Bernd Siegel, Volker Bach, Manfred Herrmann, Rudiger Sens | 2003-03-25 |
| 6332943 | Method of ink-jet printing with pigment preparations having a dispersant | Manfred Herrmann, Rudiger Sens, Bernd Siegel, Karl Siemensmeyer | 2001-12-25 |