Inventor

Alfred Brack

Inventor

Odenthal, DE

Overview

1976–1996

Patent span

Chemistry

Primary field (CPC C)

Patents· 28 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. pigments42%

C07DHeterocyclic compounds22%

D06PDyeing or printing textiles13%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests9%

B41MPrinting, duplicating, marking, or copying processes5%

C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients5%

C07CAcyclic or carbocyclic compounds3%

C09DCoating compositions, e.g. paints, varnishes or lacquers2%

PatentTitleYear

5,578,711'Process for the preparation of dyestuffs'1996 5,541,299'Process for the preparation of dyestuffs'1996 5,502,171'Process for the preparation of dyestuffs'1996 5,328,993'Cationic triazatrimethine dyestuffs'1994 4,968,797'Chromogenic 4,4-diaryldihydroquinazolones'1990 4,840,641'Cationic diazacyanine dyestuffs for dyeing polyacrylonitrile-wool blends'1989 4,754,034'Chromogenic 4,4-diaryldihydroquinazolones'1988 4,695,633'Chromogenic 4,4-diaryl-dihydroquinazolones, their preparation and their use'1987 4,446,326'Cationic naphtholactam dyestuffs'1984 4,396,768'Process for the preparation of anionic quinophthalone dyestuffs'1983 4,310,664'Process for the preparation of pyridine-4-aldehyde phenylhydrazones'1982 4,283,540'Process for the preparation of cationic naphtholactam dyestuffs'1981 4,234,488'Benz-[c,d]-indolyl compounds'1980 4,220,780'Cationic dyestuffs'1980 4,203,722'Transfer printing process with naphtholactam dyes'1980 4,147,865'Benz-(C,D)-indolyl compounds'1979 RE029834'Cationic dyestuffs'1978 4,080,331'Transfer printing process'1978 4,022,799'Naphtholactam dyestuffs'1977 4,017,484'Cationic dyestuffs'1977 4,001,253'Naphtholactam dyestuffs'1977 4,000,130'Cationic dyestuffs'1976 3,992,405'Cationic dyestuffs'1976 3,980,651'Water-insoluble barbituric acid-substituted naphthalactam dyestuff'1976 3,975,150'Transfer printing process'1976 3,971,807'Cationic dyestuffs'1976 3,959,310'Cationic dyestuffs'1976 3,950,347'Naphtholactam dyestuffs'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1996Patents assigned to BAYER AG (27)· patent assignee history

1976–1996Based in Odenthal, DE· patent location history

1976–1977Based in Leverkusen, DE· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
BAYER AG	27	1976–1996

Locations

Location	Patents	Span
Odenthal, DE	26	1976–1996
Leverkusen, DE	2	1976–1977