Inventor
Erwin Weinrich
Inventor
Haan, DE
Overview
Patents· 9 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
A61Kprimary
A61KPreparations for medical, dental or toiletry purposes43%
A61QSpecific use of cosmetics or similar toiletry preparations43%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests14%
PatentTitleYear
4,226,852'Two-component peroxide hair bleaching compositions'19804,213,758'Oxidation hair dyes based upon tetraaminopyrimidine developers and couplers therefor'1980RE030199'Oxidation hair dyes based upon tetraaminopyrimidine developers'19804,186,186'Guanidine accelerators for peroxide hair bleaching compositions'19804,171,203'Hair dye compositions containing 3,5-diamino-2-substituted-alkylbenzenes'19794,138,478'Agents for reducing the damage to hair during bleaching and dyeing'19794,129,413'Oxidation hair dyes based upon tetraaminopyrimidine developers and mono- and dialkyl -m- dihydroxy benzene couplers'19784,043,750'Developer-coupler hair dyes based on triamino-pyrimidinones'19774,003,699'Oxidation hair dyes based upon tetraaminopyrimidine developers'1977Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977Patents assigned to HENKEL & CIE GMBH (2)· patent assignee history
1977–1980Based in Haan, DE· patent location history
1977–1980Based in Dusseldorf, DE· patent location history
1978–1980Patents assigned to HENKEL KGAA (6)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HENKEL KGAA | 6 | 1978–1980 |
| HENKEL & CIE GMBH | 2 | 1977 |
Locations
| Location | Patents | Span |
|---|---|---|
| Haan, DE | 7 | 1977–1980 |
| Dusseldorf, DE | 2 | 1977–1980 |