Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5698705 | Isoindoline pigments | Frank Alfter, Erwin Dietz, Gustav Kapaun | 1997-12-16 |
| 5329046 | Biscationic acid amide and imide derivatives and processes for their preparation | Hans-Tobias Macholdt, Jorg Gitzel, Erwin Dietz | 1994-07-12 |
| 5074919 | Preparation of vat dyes and pigments of the perinone series | Erwin Dietz, Gustav Kapaun | 1991-12-24 |
| 5071483 | Process for the preparation of pigment preparations of the anthanthrone series | Erwin Dietz, Manfred Urban | 1991-12-10 |
| 5071482 | Pigment preparations | Erwin Dietz, Manfred Urban | 1991-12-10 |
| 4939193 | Use of the alpha-modification of cis-naphthoylenebis(benzimidazole) for pigmenting polyolefins | Erwin Dietz | 1990-07-03 |
| 4684753 | Process for preparing 1,3,6,8-tetrabromopyrene | Ernst Spietschka | 1987-08-04 |
| 4599431 | Process for the preparation of naphthalene-1,4,5,8-tetracarboxylic acid and its 1,8-monoanhydride in a high degree of purity | Ernst Spietschka | 1986-07-08 |
| 4224222 | Process for preparing copper phthalocyanine pigments of the .alpha.-modification | Ernst Spietschka, Wolfgang Tronich | 1980-09-23 |