Method for dyeing keratin fibres with oxidation dye precursors and direct powder dyes
CA 2252499 A1 · Owner: Zemori, Nicole · Inventors: Rondeau, Christine; Zemori, Nicole
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for dyeing keratin fibres, particularly human keratin fibres and more particularly hair, is disclosed. It is characterised by the fact that when it is used an extemporaneous mixture is applied on the keratin fibres of a composition (A) containing one or more oxidation dye precursors and optionally one or more couplers of a composition (B), in powder form, containing one or more direct dyes preferably cationic, optionally dispersed in an organic pulverulent excipient and/or a mineral pulverulent excipient and a composition (C) containing one or more oxidizing agents. The invention also features a ready-to-use composition of three components (A) (B), and (C) stored separately and …
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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
- Filed April 11, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 11, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 11, 2019.
- 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.