Inventor
Heinrich Frolich
Inventor
Niedernhausen, DE
Overview
Patents· 7 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. pigments46%
D06PDyeing or printing textiles23%
C07CAcyclic or carbocyclic compounds15%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests15%
PatentTitleYear
5,128,454'.beta.-modified crystalline fed monoazo pigment'19924,987,258'4,4\'-diaminodiphenyl compounds, process for their preparation and their use'19914,987,221'Bisdiazonium salts of 4,4\'-diamino-3,3\'-dialkoxybiphenyls and a process for their preparation'19914,696,675'Process for preparing water-insoluble blue azo dyes on the fiber: hydroxynaphthoic amide and diazotized di-alkoxy-benzidine'19874,665,163'Diaryl pigments with improved heat stability obtained by coupling bis-diazotized diamines with acetoacetanilides'19874,251,441'Pigments of mixtures of methoxynitrobenzene-azo-methoxy-acetanilides'19814,150,019'Water-insoluble yellow terephthalate-azo-acetoacetylamido-benzimidazolone dyestuffs'1979Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1979–1992Patents assigned to HOECHST AG (7)· patent assignee history
1979Based in Kelkheim, DE· patent location history
1981–1992Based in Niedernhausen, DE· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HOECHST AG | 7 | 1979–1992 |
Locations
| Location | Patents | Span |
|---|---|---|
| Niedernhausen, DE | 6 | 1981–1992 |
| Kelkheim, DE | 1 | 1979 |