Inventor
Erwin Fleckenstein
Inventor
Hofheim, DE
Overview
Patents· 8 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C07Dprimary
C07DHeterocyclic compounds42%
C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments25%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests25%
D06PDyeing or printing textiles8%
PatentTitleYear
4,160,764'Water-insoluble monoazo-dyestuffs for synthetic fibrous materials'19794,061,642'2,4,6-Trisubstituted-3-pyridine carboxamides'19774,028,321'Basic azo amino-phenylene dyestuffs'19773,980,659'Certain 6-amino-4-hydrocarbyl-nicotinamides'19763,954,782'2,6-Hydrazino-3-pyridine carboxyamides'19763,947,463'Certain 2-amino-nicotinonitrile derivatives'19763,946,024'2-Hydrocarbyloxy-pyridine compounds'19763,939,142'Phenylazophenyl dyestuff'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1977Patents assigned to CASSELLA FARBWERKE MAINKUR AG (5)· patent assignee history
1976–1979Patents assigned to HOECHST AG (3)· patent assignee history
1976–1979Based in Hofheim, DE· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| CASSELLA FARBWERKE MAINKUR AG | 5 | 1976–1977 |
| HOECHST AG | 3 | 1976–1979 |
Locations
| Location | Patents | Span |
|---|---|---|
| Hofheim, DE | 8 | 1976–1979 |