Inventor

Ernst Schefczik

Inventor

Ludwigshafen, DE

Overview

1976–2000

Patent span

Chemistry

Primary field (CPC C)

Patents· 51 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

C09Bprimary

C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments43%

C07DHeterocyclic compounds21%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests14%

B41MPrinting, duplicating, marking, or copying processes8%

C07CAcyclic or carbocyclic compounds3%

D06PDyeing or printing textiles3%

Y10TTechnical subjects covered by former us classification3%

G11BInformation storage based on relative movement between record carrier and transducer2%

A01NPreservation of bodies of humans or animals or plants or parts thereof1%

C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients1%

PatentTitleYear

6,043,369'[1,3,4] Triazolo [1,5-A] pyridines'2000 5,929,245'Naphtholactam dyes'1999 5,703,238'Preparation of pyridine dyes'1997 5,654,122'N-aminopyridone dyes'1997 5,637,702'Sulfur compounds'1997 5,616,710'Triazolopyridine dyes'1997 5,612,465'Phenylazotriazolopyridine dyestuffs'1997 5,608,041'Azo dyestuffs containing a diazo component from the aniline series and coupling component from the triazolopyridine series'1997 5,580,980'N-aminopyridone dyes'1996 5,538,939'Acylamino-substituted isoxazole or isothiazole derivatives, their preparation and their use'1996 5,491,232'Sulfur compounds useful for preparation of dyes'1996 5,466,812'Preparation of N-aminopyridones'1995 5,352,774'Dyes containing thiophene radicals'1994 5,283,326'Dyes containing thiophene radicals'1994 5,270,456'Azo dyes with A2-aminothiophene dye azo component and a coupling component and coupling component of the diphenylamine series'1993 5,212,309'3-aminobenzene-1,2,4,5-tetracarboxylic dihydrazides and composition capable of chemiluminescence, and 3-aminobenzene-1,2,4,5-tetracarboxylic dianhydrides'1993 5,206,375'Thiophene derivatives'1993 5,147,845'Triazolopyridine dyes and thermal transfer of methine dyes'1992 5,145,952'Thiopheneazo dyes with a coupling component based on M-phenylenediamine'1992 5,132,412'Thiazoleazo dyes having a diazo component from the isothiazole or thiadiazole series'1992 5,101,028'(1,2,4)triazolo[2,3-a]pyridines'1992 5,079,365'Triazolopyridine dyes and thermal transfer of methine dyes'1992 5,062,861'Novel navy and black disperse dye mixtures including amino-phenyl thiophene azo disperse dye and red, yellow or orange disperse dyes'1991 5,047,570'Preparation of 2-cyano-3-aminoacrylonitrile derivatives'1991 4,994,564'Azo dyes with a diazo component of the 3-amino thiophene series and a coupling component of the pyridine, pyridone or pyrazole series'1991 4,960,874'Isothiazolylazo dyes having aminophenyl and aminonaphthyl components'1990 4,960,873'3-pyridylisothiazoleazo compounds useful as disperse dyes'1990 4,952,681'Dyes containing 3,4-disubstituted-2-diaza-thiophene radicals'1990 4,939,012'Naphtholactam dyes and optical recording medium containing these dyes'1990 4,929,720'Isothiazoleazo hydroxypyridone dyes'1990 4,908,041'Navy and black dye mixtures: thiophene azo disperse dye and red, yellow or orange disperse dye'1990 4,904,777'Mono azo dyes containing as diazo radical a thiophene radical which possesses an oxime group'1990 4,876,356'Naphtholactam dyes and optical recording medium containing these days'1989 4,837,269'2-aminothiophene radical substituted by an electron withdrawing group'1989 4,774,324'Isothiazolylazo dyes'1988 4,764,600'Isothiazolylazo dyes having aminophenyl and aminonaphthyl components'1988 4,667,051'Preparation of cyano-substituted enol ethers'1987 4,619,992'3-(.beta.-aminoethyl)-4-cyano-isothiazolylazo dyes'1986 4,611,064'Preparation of indole derivatives'1986 4,525,591'2,4-Dioxotetrahydropyrimido-(1,2-a)-benzimidazole substituted isoindoline dyes and their use'1985 4,496,480'Isothiazolazo dyes having coupling components which are free from unsaturated aliphatic radicals'1985 4,352,932'Isoindoline colorants'1982 4,315,855'Monoazo disperse dyes containing a nitrophenyl group and a homophthalimide group'1982 4,096,145'Naphtholactam derivatives'1978 4,062,845'Naphtholactam dyes'1977 4,009,165'Naphtholactam dyes'1977 4,001,335'Production of 3-monochloro-2,4,5-trialkylbenzophenones and 3,6-dichloro-2,4,5-trialkylbenzophenones'1977 3,997,541'Lactones of the benzazaxanthene series and dye-forming components for duplication processes'1976 3,963,747'Basic arylmercaptonaphtholactam dyes'1976 3,950,340'Quinazoline dyes'1976 3,946,017'Lactones of the benzaxanthere series and dye-forming components for use in duplication processes'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–2000Patents assigned to BASF AG (48)· patent assignee history

1976–2000Based in Ludwigshafen, DE· patent location history

1994Patents assigned to SANDOZ AG (2)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
BASF AG	48	1976–2000
SANDOZ AG	2	1994

Locations

Location	Patents	Span
Ludwigshafen, DE	51	1976–2000