Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5368641 | Modified 2,9-dimethylquinacridone pigments, process for their manufacture and a method for pigmenting or lacquer systems with these pigments | Erwin Dietz | 1994-11-29 |
| 5137576 | Quinacridones having selectively adjusted triboelectric effects | Hans-Tobias Macholdt, Alexander Sieber, Erwin Dietz | 1992-08-11 |
| 5070159 | Addition compounds, a process for the preparation, and their use, based on epoxy novolac-fatty amine adducts | Erwin Dietz, Andreas Sommer, Jurgen Hohn, Otmar Hafner, Wolfgang Rieper | 1991-12-03 |
| 4986852 | Pigments and use thereof | Erwin Dietz, Gustav Kapaun, Michael Kappert, Frank Prokschy, Manfred Urban | 1991-01-22 |
| 4777105 | Magenta colorant for electrophotographic recording processes | Hans-Tobias Macholdt, Alexander Sieber | 1988-10-11 |
| 4758665 | Process for preparing high-hiding gamma-modification of unsubstituted linear transquinacridone | Ernst Spietschka | 1988-07-19 |
| 4732618 | Powdered pigments with improved rheological properties, processes for their preparation and their use with a content of at least 5% of unsubstituted quinacridone | Ernst Spietschka, Otmar Hafner | 1988-03-22 |
| 4631330 | Addition compounds and process for their preparation | Erwin Dietz, Albert Munkel, Otmar Hafner, Wolfgang Rieper | 1986-12-23 |
| 4405734 | Process for mass coloring thermoplastic plastics | Otto Fuchs, Wolfgang Teige | 1983-09-20 |
| 4400515 | Quinacridone mixtures, process for their manufacture and their use as pigments | Otto Fuchs | 1983-08-23 |
| 4217265 | Pigment preparations | Erwin Dietz, Otto Fuchs, Robert Gutbrod, Michael Maikowski | 1980-08-12 |
| 4212975 | Process for the manufacture of the gamma-crystal modification of linear trans-quinacridone | Otto Fuchs, Ernst Spietschka | 1980-07-15 |