Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7307170 | Epindolidione pigments | Bansi Lal Kaul, Bruno Piastra, Valérie Wolf, Martin Schmidt | 2007-12-11 |
| 5055580 | Substituted polycylic derivatives of the 9-oxo-1,9a,10-triaza-9-hydroanthracene and method for coloring of native or synthetic materials | Erwin Dietz | 1991-10-08 |
| 4986852 | Pigments and use thereof | Erwin Dietz, Gustav Kapaun, Michael Kappert, Adolf Kroh, Manfred Urban | 1991-01-22 |
| 4937345 | Process for the preparation of 2-(arylamino)-3-carboxy-9(10H)-acridones | Erwin Dietz, Heinrich Hamal | 1990-06-26 |
| 4881980 | Pigments of the quinacridonequinone series, processes for their preparation and their use | Erwin Dietz | 1989-11-21 |
| 4758664 | Process for the preparation of linear quinacridones | Ernst Spietschka | 1988-07-19 |
| 4693753 | Pigments of the quinacridonequinone series, process for their preparation and their use | Ernst Spietschka | 1987-09-15 |