Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6174635 | Electrophotographic recording material containing metal-free phthalocyanines | David R. Terrell, Stefaan De Meutter | 2001-01-16 |
| 5721080 | Electrophotographic material containing particular phthalocyanines | David R. Terrell, Stefaan De Meutter | 1998-02-24 |
| 5525152 | Pigment salts and their use for dyeing and pigmenting | Peter Roschger, Stephan Michaelis, Gunther Franke, Bernd Woost | 1996-06-11 |
| 5386051 | Process for the preparation of 1,2,3-tricyanobenzene, phthalocyanines which are obtainable from 1,2,3-tricyanobenzene, and their use as pigments | Gunther Beck | 1995-01-31 |
| 5367069 | Metal-free, substituted phthalocyanines in the .chi.-modification | Gunther Beck | 1994-11-22 |
| 5326872 | Process for preparation of asymmetric isoindoline pigments | Barbara Wagner | 1994-07-05 |
| 5194626 | Metal complex pigments of azines | Meinhard Rolf | 1993-03-16 |
| 5177209 | Process for preparation of asymmetric isoindoline pigments | Barbara Wagner | 1993-01-05 |
| 5162518 | Heterocyclic compounds and porphyrin compounds obtainable therefrom | Meinhard Rolf, Walther Wolf, David R. Terrell | 1992-11-10 |
| 5134048 | Electrophotographic recording material containing photoconductive porphyrin compounds | David R. Terrell, Stefaan De Meutter | 1992-07-28 |
| 5091532 | Process for the preparation of pigments based on isoindole | Meinhard Rolf | 1992-02-25 |