Inventor
HARI STEFAN
CH25 patents
Patents
25 patentsUS4138568AFeb 6, 1979
Process for the manufacture of benzimidazolones-(2)
CIBA GEIGY CORP31 citations87
US5380870AJan 10, 1995
Mixed crystals of sulfonated diketopyrrolopyrroles
CIBA GEIGY CORP19 citations82
US4992495AFeb 12, 1991
Process for coloring high-molecular weight organic material using amine salts of azo pigments based on pyrazolone derivatives
CIBA GEIGY CORP13 citations81
US4044036AAug 23, 1977
Metal complexes of bis-azomethines from hydroxy-aldehydes and alkylene diamines
CIBA GEIGY CORP20 citations78
US4946948AAug 7, 1990
Mono and disazo compounds based on b-hydroxy-naphthoic acid derivatives or acetoacetarylide derivatives containing long-chain alkyl ester or alkylamide radicals
CIBA GEIGY CORP7 citations74
US5151505ASep 29, 1992
Amine salts of azo pigments based on pyrazolone derivatives
CIBA GEIGY CORP6 citations73
US4400319AAug 23, 1983
Monoazo pigments containing heterocycles, and high-molecular organic materials dyed therewith
CIBA GEIGY CORP7 citations73
US4220586ASep 2, 1980
Hetero-aryl azo acylamino substituted aceto-acetarylide pigments
CIBA GEIGY CORP12 citations73
US3956266AMay 11, 1976
Bis-(benzimidazolone-azo-acetoacetylamino)-phenylene pigments
CIBA GEIGY CORP18 citations73
US4980458ADec 25, 1990
Mixed sodium, ammonium and/or calcium salt crystals of laked monoazo disulfonated pyrazolone pigments
CIBA GEIGY CORP16 citations72
US5395926AMar 7, 1995
Bisazo, bisazomethine and azo-azomethine compounds derived from 1,4-phenylenediamine sulfonic acid salts
CIBA GEIGY CORP5 citations63
US4997920AMar 5, 1991
Monoazo compounds containing long-chain alkyl radicals
CIBA GEIGY CORP6 citations63
US5298609AMar 29, 1994
Disazo compounds containing cycloalkyl ester or cycloalkylamide groups
CIBA GEIGY CORP2 citations62
US5280121AJan 18, 1994
Perylenetetracarboxylic acid diimides containing long-chain alkanoylamino radicals
CIBA GEIGY CORP5 citations62
US5071967ADec 10, 1991
Disazo compounds containing long-chain alkyl ester radicals or alkylamide radicals
CIBA GEIGY CORP3 citations62
US4737581AApr 12, 1988
Phenyl-azo-hydroxynaphthoic acid amide pigments containing at least one carbonamide group
CIBA GEIGY CORP4 citations62
US4602961AJul 29, 1986
Process for pigmenting high molecular weight organic material
CIBA GEIGY CORP3 citations62
US4473500ASep 25, 1984
Monoazo pigments derived from aminophthalimides and substituted acetoacetarylides or 2-hydroxy-3-naphthoylarylides
CIBA GEIGY CORP2 citations62
US4088641AMay 9, 1978
4-Methyl-5-(benzimidazolonylazo)-6-hydroxypyridone-2 pigment
CIBA GEIGY CORP2 citations62
US4062838ADec 13, 1977
Disazo pigments containing acylamino groups
CIBA GEIGY CORP5 citations62
US4031073AJun 21, 1977
Monoazo pigments containing barbituric acid or thio- or imino-derivatives thereof
CIBA GEIGY CORP3 citations62
US4081439AMar 28, 1978
Aromatic disazo pigments
CIBA GEIGY CORP4 citations61
US4263205AApr 21, 1981
Monoazo pigments derived from substituted aminothiophenes
CIBA GEIGY CORP1 citations52
USRE35359EOct 22, 1996
Amine salts of azo pigments based on pyrazolone derivatives
CIBA GEIGY CORP0 citations51
US4093613AJun 6, 1978
Trisazo pigments containing two barbituric acid coupling components
CIBA GEIGY CORP0 citations51