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Inventor

Norbert Armbrecht

Inventor
Sulzbach, DE

Overview

2→
Patents
1984–1985
Patent span
Chemistry
Primary field (CPC C)

Patents· 2 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. pigments67%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests33%
PatentTitleYear
4,492,653'Water-soluble trisazo dyestuffs on the basis of a combination of naphthalene-, diphenylamine- and pyrazolone derivatives'19854,485,042'Dyestuff containing at least three azo bridges'1984

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1984Patents assigned to CASSELLA FARBWERKE MAINKUR AG (1)· patent assignee history
1984–1985Based in Sulzbach, DE· patent location history
1985Patents assigned to HOECHST AG (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
CASSELLA FARBWERKE MAINKUR AG11984
HOECHST AG11985
Locations
LocationPatentsSpan
Sulzbach, DE21984–1985