Inventor
SCHIESSLER SIEGFRIED
15 patents
Patents
15 patentsUS5071482ADec 10, 1991
Pigment preparations
HOECHST AG13 citations74
US5071483ADec 10, 1991
Process for the preparation of pigment preparations of the anthanthrone series
HOECHST AG14 citations74
US4224222ASep 23, 1980
Process for preparing copper phthalocyanine pigments of the α-modification
HOECHST AG8 citations73
US4018791AApr 19, 1977
Process for the preparation of highly pure halogenated phthalocyanine pigment
HOECHST AG12 citations73
US5698705ADec 16, 1997
Isoindoline pigments
HOECHST AG11 citations72
US4153602AMay 8, 1979
Process for the preparation of a N,N'-dimethyl-perylene-3,4,9,10-tetracarboxylic acid diimide pigment
HOECHST AG8 citations72
US4010240AMar 1, 1977
Process for the regeneration of sulfuric acid
HOECHST AG7 citations72
US3972987AAug 3, 1976
Process for regenerating sulfuric acid
HOECHST AG10 citations72
US5329046AJul 12, 1994
Biscationic acid amide and imide derivatives and processes for their preparation
HOECHST AG4 citations62
US5074919ADec 24, 1991
Preparation of vat dyes and pigments of the perinone series
HOECHST AG4 citations62
US4939193AJul 3, 1990
Use of the alpha-modification of cis-naphthoylenebis(benzimidazole) for pigmenting polyolefins
HOECHST AG2 citations62
US4599431AJul 8, 1986
Process for the preparation of naphthalene-1,4,5,8-tetracarboxylic acid and its 1,8-monoanhydride in a high degree of purity
HOECHST AG2 citations62
US4010180AMar 1, 1977
Process for the purification of copper phthalocyanine
HOECHST AG4 citations62
US4056534ANov 1, 1977
Process for preparing copper phthalocyanine pigments of the α-modification
HOECHST AG6 citations59
US4684753AAug 4, 1987
Process for preparing 1,3,6,8-tetrabromopyrene
HOECHST AG1 citations51