Issued Patents All Time
Showing 1–25 of 58 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7056378 | Method for producing vattable organic pigments | Joachim Weber, Erwin Dietz | 2006-06-06 |
| 6646126 | Process for preparing perylene-3,4,9,10-tetracarboxylic diimide in transparent pigment form | Joachim Weber, Gerhard Wilker, Martin Bohmer, Erwin Dietz | 2003-11-11 |
| 6521756 | Process for preparing perylene-3,4,9,10-tetracarboxylic diimide in transparent pigment form | Joachim Weber, Gerhard Wilker, Martin Bohmer, Erwin Dietz | 2003-02-18 |
| 6413309 | Pigment preparations comprising two or more perylene compounds | Joachim Weber, Manfred Opravil, Erwin Dietz | 2002-07-02 |
| 6312512 | Quinacridone mixed-crystal pigments of the gamma phase | Martin Boehmer, Joachim Weber, Dieter Schnaitmann, Margit Haberlick | 2001-11-06 |
| 6251553 | Use of mixed-crystal pigments of the quinacridone series in electrophotographic toners and developers, powder coatings and inkjet inks | Ruediger Baur, Hans-Tobias Macholdt, Dieter Schnaitmann, Martin Boehmer | 2001-06-26 |
| 6241814 | Process for preparing quinacridone pigments | Martin Boehmer, Dieter Schnaitmann, Joachim Weber | 2001-06-05 |
| 6221150 | Perylene compounds and pigment preparations | Joachim Weber, Erwin Dietz | 2001-04-24 |
| 6174361 | Process for preparing N,N'-dimethylperylene-3,4,9,10-tetracarboxylic diimide in transparent pigment form | Martin Boehmer, Joachim Weber | 2001-01-16 |
| 5989333 | Mixed crystal pigments of the quinacridone series | Martin Boehmer, Dieter Schnaitmann | 1999-11-23 |
| 5958129 | Pigment formulations and processes for their preparation | Dieter Schnaitmann, Margit Haberlick | 1999-09-28 |
| 5932727 | Process for the preparation of dioxazine compounds | Gert Nagl, Wolfgang Bauer, Dieter Schnaitmann | 1999-08-03 |
| 5800607 | Process for the preparation of liquid pigment preparations | Dieter Schnaitmann, Martin Bohmer | 1998-09-01 |
| 5755874 | Process for preparing linear unsubstituted .beta.-phase quinacridone pigments | Dieter Schnaitmann | 1998-05-26 |
| 5755872 | Process for preparing quinacridone pigments | Dieter Schnaitmann, Martin Bohmer | 1998-05-26 |
| 5746820 | Surface-treated quinacridone and dioxazine pigments | Dieter Schnaitmann | 1998-05-05 |
| 5662739 | Use of fatty acid taurides for the dispersion of polycyclic pigments | Erwin Dietz | 1997-09-02 |
| 5626662 | Fine division in the preparation of organic pigments | — | 1997-05-06 |
| 5614014 | Process for the preparation of Quinacridone pigments | — | 1997-03-25 |
| 5614015 | Process for the preparation of 4,10-dibromoanthanthrone pigment | Gerhard Wilker | 1997-03-25 |
| 5591258 | Preparation of linear, unsubstituted quinacridone pigments of the .beta.-phase | Erwin Dietz | 1997-01-07 |
| 5492563 | Fine division in the preparation of copper phthalocyanine pigments | — | 1996-02-20 |
| 5466807 | Perylene compounds containing sulfonic acid groups process for preparing them and their use | Erwin Dietz | 1995-11-14 |
| 5318627 | Process for the preparation of pigment preparations based on C.I. pigment violet 23 | Erwin Dietz | 1994-06-07 |
| 5296033 | Process for the production of pigment preparations based on phythalocyanine pigments | Erwin Dietz | 1994-03-22 |