Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6258959 | Process for the preparation of 2,4-dimethyl-3,5-bisalkoxycarbonylpyrrole | Carsten Groning, Markus Frede, Klaus Ebel | 2001-07-10 |
| 6166223 | Process for the preparation of 2,4-dimethylpyrrole | Carsten Groning, Markus Frede, Klaus Ebel | 2000-12-26 |
| 4956464 | Preparation of dihydroquinacridones, quinacridones and quinacridonequinones | Herbert Bender, Horst Colberg, Friedhelm Teich | 1990-09-11 |
| 4845214 | Process for conditioning isoindoline pigments | Wolfgang Lotsch | 1989-07-04 |
| 4746740 | Isoindoline colorants | Wolfgang Lotsch | 1988-05-24 |
| 4723023 | Isoindoline dyes | Erwin Hahn, Wolfgang Lotsch | 1988-02-02 |
| 4609726 | Disazo dyes derived from 3,3'-dihalo-5,5'-dichlorobenzidine | Egon Liedek | 1986-09-02 |
| 4602960 | Modified diarylide pigments and their preparation | Egon Liedek, Wolfgang Ruff, Gerhard Berger, Hans W. Sonneborn | 1986-07-29 |
| 4525591 | 2,4-Dioxotetrahydropyrimido-(1,2-a)-benzimidazole substituted isoindoline dyes and their use | Wolfgang Lotsch, Ernst Schefczik | 1985-06-25 |
| 4480097 | Isoindoline colorants | Wolfgang Lotsch | 1984-10-30 |
| 4401815 | Isoindoline colorants | Wolfgang Lotsch, Gustav Bock, Wolfgang Elser | 1983-08-30 |
| 4352932 | Isoindoline colorants | Wolfgang Lotsch, Ernst Schefczik | 1982-10-05 |
| 4340735 | Isoindoline colorants | Wolfgang Lotsch | 1982-07-20 |