Inventor

HAHN ERWIN

DE51 patents

Patents

50 patents

US5470502ANov 28, 1995

Fluorescent pigments

BASF AG77 citations96

US5076808ADec 31, 1991

Dyeing of polyamide substrates with an organic n-nitroso-hydroxylamine as light stabilizer

BASF AG56 citations96

US5410053AApr 25, 1995

Navy and black dye mixtures: thiophene azo disperse dye and red, yellow or orange disperse dye

BASF AG7 citations74

US4885396ADec 5, 1989

Process for the preparation of 2-hydroxy-4-(2'-hydroxyethoxy) benzophenones

BASF AG11 citations74

US4751288AJun 14, 1988

Azo dyes containing 2-amino-3-cyano-5-formylthiophene derivatives as diazo components and substituted aniline compounds as coupling components

BASF AG7 citations74

US4670591AJun 2, 1987

Preparation of N-α-alkoxyethylformamides

BASF AG15 citations74

US4668775AMay 26, 1987

α-methine substituted thiophene monoazo dye

BASF AG11 citations74

US5051504ASep 24, 1991

Doubled triphenylmethane dyes having bis acylpiperazine linkage

BASF AG10 citations72

US4764599AAug 16, 1988

Disazo compounds containing an N,N-bis(2-amino-benzoyl)piperazine derivative as the diazo component

BASF AG8 citations72

US5154763AOct 13, 1992

Stabilized aqueous alkyldiketene emulsions

BASF AG9 citations71

US5560961AOct 1, 1996

Process of making metal-coated melamine/formaldehyde resin fibers

BASF AG10 citations69

US5393828AFeb 28, 1995

Chemical degradation of cured amino resins

BASF AG2 citations63

US5112362AMay 12, 1992

Navy dye mixtures of azo disperse dyes for polyester

BASF AG5 citations63

US5062861ANov 5, 1991

Novel navy and black disperse dye mixtures including amino-phenyl thiophene azo disperse dye and red, yellow or orange disperse dyes

BASF AG4 citations63

US4945167AJul 31, 1990

Preparation of N-hydroxypyrazoles

BASF AG2 citations63

US4820809AApr 11, 1989

Heterocyclic azo dyes

BASF AG3 citations63

US4654432AMar 31, 1987

Preparation of 2-(hydroxymethyl)-acrylonitrile and 2-(hydroxymethyl)-acrylates

BASF AG5 citations63

US4393005AJul 12, 1983

Cationic phthalocyanine dyes

BASF AG6 citations63

US5424461AJun 13, 1995

Preparation of 1-amino-4-hydroxyanthraquinone

BASF AG4 citations62

US5298610AMar 29, 1994

Thiazoleazo dyes having a coupling component of the diphenylamine series

BASF AG4 citations62

US5286401AFeb 15, 1994

Use of heterocyclic compounds as bleach activators or optical brighteners in washing and cleaning agents

BASF AG5 citations62

US5270456ADec 14, 1993

Azo dyes with A2-aminothiophene dye azo component and a coupling component and coupling component of the diphenylamine series

BASF AG3 citations62

US4723023AFeb 2, 1988

Isoindoline dyes

BASF AG2 citations62

US4629616ADec 16, 1986

Basic chromium aluminum sulfates and their preparation

BASF AG3 citations62

US4377387AMar 22, 1983

Deliming hides

BASF AG3 citations62

US4332955AJun 1, 1982

Preparation of transparent pigmentary forms of 4,4',7,7'-tetrachlorothioindigo

BASF AG3 citations62

US4298534ANov 3, 1981

Preparation of brilliant, transparent pigmentary bromo-isoviolanthrone of high tinctorial strength

BASF AG2 citations62

US5421990AJun 6, 1995

Production of shining shaped articles coated with zinc or a zinc alloy

BASF AG2 citations61

US4694075ASep 15, 1987

Bisazo compounds containing anthranilic acid and thiazole moieties

BASF AG5 citations61

US4491544AJan 1, 1985

Dyes having a diazo component and an isoquinoline coupling component

BASF AG2 citations61

US4970321ANov 13, 1990

Preparation of cyclic N,N'-dimethylureas

BASF AG3 citations60

US4213900AJul 22, 1980

Spray-drying method for the preparation of water-dispersible pulverulent disperse dye formulations

BASF AG5 citations60

US4213760AJul 22, 1980

Deliming of hides

BASF AG4 citations59

US5256826AOct 26, 1993

Preparation of aromatic carbonyl or sulfonyl compounds with an aryl ether structure

BASF AG2 citations58

US5371232ADec 6, 1994

Preparation of 2-(4-aminophenyl)benzothiazole compounds

BASF AG3 citations57

US5144064ASep 1, 1992

Preparation of J-acid urea

BASF AG1 citations52

US4652669AMar 24, 1987

2-(1-hydroxycarbalkoxymethyl)-acrylonitriles and 2-(1-hydroxycarbalkoxymethyl)-acrylates and their preparation

BASF AG1 citations52

US4512929AApr 23, 1985

1-Alkyl-2-isocyanatomethyl-isocyanatobenzenes and/or 1-alkyl-4-isocyanatomethyl-isocyanatobenzenes

BASF AG0 citations52

US4477381AOct 16, 1984

Triaminotriarylmethane colorants

BASF AG1 citations52

US4751314AJun 14, 1988

Preparation of tetrachloro-3-iminoisoindolin-1-one

BASF AG1 citations51

US4322210AMar 30, 1982

Auxiliary, and process, for the soaking of hides

BASF AG1 citations51

US4861898AAug 29, 1989

Isoindoline metal complexes

BASF AG1 citations50

US5286854AFeb 15, 1994

Basic azo dyes with a coupling component of the hydroxynaphthalenecarboxylic acid series

BASF AG0 citations49

Showing the top 50 of 51 patents by PatentIndex Score.

HAHN ERWIN

Patents

Fluorescent pigments

Dyeing of polyamide substrates with an organic n-nitroso-hydroxylamine as light stabilizer

Rhodamine derivatives

Recycling of cured aminoplast resins

Azo dyes with a coupling component of the quinoline series

Tetrachloroperylene-3,4,9,10-tetracarboxylic acid diimide pigment and its use

Coloring paper

Disperse dye formulations

Recycling of cured aminoplast resins

Navy and black dye mixtures: thiophene azo disperse dye and red, yellow or orange disperse dye

Process for the preparation of 2-hydroxy-4-(2&#39;-hydroxyethoxy) benzophenones

Azo dyes containing 2-amino-3-cyano-5-formylthiophene derivatives as diazo components and substituted aniline compounds as coupling components

Preparation of N-α-alkoxyethylformamides

α-methine substituted thiophene monoazo dye

Doubled triphenylmethane dyes having bis acylpiperazine linkage

Disazo compounds containing an N,N-bis(2-amino-benzoyl)piperazine derivative as the diazo component

Stabilized aqueous alkyldiketene emulsions

Process of making metal-coated melamine/formaldehyde resin fibers

Chemical degradation of cured amino resins

Navy dye mixtures of azo disperse dyes for polyester

Novel navy and black disperse dye mixtures including amino-phenyl thiophene azo disperse dye and red, yellow or orange disperse dyes

Preparation of N-hydroxypyrazoles

Heterocyclic azo dyes

Preparation of 2-(hydroxymethyl)-acrylonitrile and 2-(hydroxymethyl)-acrylates

Cationic phthalocyanine dyes

Preparation of 1-amino-4-hydroxyanthraquinone

Thiazoleazo dyes having a coupling component of the diphenylamine series

Use of heterocyclic compounds as bleach activators or optical brighteners in washing and cleaning agents

Azo dyes with A2-aminothiophene dye azo component and a coupling component and coupling component of the diphenylamine series

Isoindoline dyes

Basic chromium aluminum sulfates and their preparation

Deliming hides

Preparation of transparent pigmentary forms of 4,4&#39;,7,7&#39;-tetrachlorothioindigo

Preparation of brilliant, transparent pigmentary bromo-isoviolanthrone of high tinctorial strength

Production of shining shaped articles coated with zinc or a zinc alloy

Bisazo compounds containing anthranilic acid and thiazole moieties

Dyes having a diazo component and an isoquinoline coupling component

Preparation of cyclic N,N&#39;-dimethylureas

Spray-drying method for the preparation of water-dispersible pulverulent disperse dye formulations

Deliming of hides

Preparation of aromatic carbonyl or sulfonyl compounds with an aryl ether structure

Preparation of 2-(4-aminophenyl)benzothiazole compounds

Preparation of J-acid urea

2-(1-hydroxycarbalkoxymethyl)-acrylonitriles and 2-(1-hydroxycarbalkoxymethyl)-acrylates and their preparation

1-Alkyl-2-isocyanatomethyl-isocyanatobenzenes and/or 1-alkyl-4-isocyanatomethyl-isocyanatobenzenes

Triaminotriarylmethane colorants

Preparation of tetrachloro-3-iminoisoindolin-1-one

Auxiliary, and process, for the soaking of hides

Isoindoline metal complexes

Basic azo dyes with a coupling component of the hydroxynaphthalenecarboxylic acid series

Process for the preparation of 2-hydroxy-4-(2'-hydroxyethoxy) benzophenones

Preparation of transparent pigmentary forms of 4,4',7,7'-tetrachlorothioindigo

Preparation of cyclic N,N'-dimethylureas