Keratin fibre oxidation dye composition and dye process using the composition
CA 2223726 C · Owner: L'Oreal · Inventors: Cotteret, Jean; Rondeau, Christine; De La Mettrie, Roland
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a ready-to-use composition for the oxidation dye of keratin fibre in particular human keratin fibres such as hair consisting of at least one oxidation base in association with at least one substituted meta-aminophenol coupler at least one selected direct cationic dye and at least one oxidizing agent and the dye process using this composition.
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
- Filed December 22, 1997 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 22, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 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.