Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5266110 | Crystal modification of C.I. Pigment Yellow 16 | Edwin Baier | 1993-11-30 |
| 5243032 | Preparation of azo pigments with low PCB content by coupling in the presence of olefins | — | 1993-09-07 |
| 5194597 | Preparation of a coupling product of bisiazotized 2,2',5,5'-tetrachloro-4,4'-diaminobiphenyl with two equivalents of n-acetoacetyl-2,4-dimethylanilide | — | 1993-03-16 |
| 5086168 | Monoazo pigments derived from diazotized di- or trichloroanilines, preparation thereof and their use | — | 1992-02-04 |
| 5070159 | Addition compounds, a process for the preparation, and their use, based on epoxy novolac-fatty amine adducts | Erwin Dietz, Andreas Sommer, Adolf Kroh, Jurgen Hohn, Otmar Hafner | 1991-12-03 |
| 5066687 | Powdered azo pigments with improved rheological properties, process for their preparation and their use | Otmar Hafner | 1991-11-19 |
| 4720541 | Process for improving the application properties of disazo pigments | Klaus Hunger | 1988-01-19 |
| 4631330 | Addition compounds and process for their preparation | Erwin Dietz, Albert Munkel, Otmar Hafner, Adolf Kroh | 1986-12-23 |
| 4589921 | Process for improving the application properties of pigment yellow 13 | Klaus Hunger | 1986-05-20 |
| 4476052 | Azo pigment having improved hiding power and a process for its preparation | Klaus Hunger, Joachim Ribka, Friedrich Weingarten | 1984-10-09 |
| 4410707 | Process for the manufacture of 3-amino-1-phenylpyrazol-5-one | Wolfgang Tronich, Peter Bohme | 1983-10-18 |