Hair dyes based upon tetra-aminopyrimidine developers and mono- and dialkyl -m- dihydroxybenzene couplers
CA 1085733 A · Owner: Henkel Kommanditgesellschaft Auf Aktien (Henkel Kgaa) · Inventors: Lieske, Edgar; Rose, David; Weinrich, Erwin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aqueous hair dye preparation comprising an oxidation dyestuff combination of a developer component consisting of a tetraaminopyrimidine derivative or a water-soluble acid addition salt thereof and a coupler component consisting of a mono- and/or dialkyl-m- dihydroxybenzene wherein the alkyl, radical has 1-4 carbon atoms; as well as a process for dyeing hair by utilizing this oxidation dyestuff combination. - A -
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 16, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 16, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.