Inventor
FROELICH HEINRICH
6 patents
Patents
6 patentsUS4665163AMay 12, 1987
Diaryl pigments with improved heat stability obtained by coupling bis-diazotized diamines with acetoacetanilides
HOECHST AG9 citations70
US4251441AFeb 17, 1981
Pigments of mixtures of methoxynitrobenzene-azo-methoxy-acetanilides
HOECHST AG13 citations68
US4987258AJan 22, 1991
4,4'-diaminodiphenyl compounds, process for their preparation and their use
HOECHST AG6 citations67
US5128454AJul 7, 1992
β-modified crystalline fed monoazo pigment
HOECHST AG4 citations59
US4987221AJan 22, 1991
Bisdiazonium salts of 4,4'-diamino-3,3'-dialkoxybiphenyls and a process for their preparation
HOECHST AG0 citations50
US4696675ASep 29, 1987
Process for preparing water-insoluble blue azo dyes on the fiber: hydroxynaphthoic amide and diazotized di-alkoxy-benzidine
HOECHST AG1 citations50