Oxidation dyeing composition for keratinous fibres and dyeing method using same
CA 2400459 A1 · Owner: L'Oreal · Inventors: Lang, Gerard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns an oxidation dyeing composition for keratinous fibres and in particular human keratinous fibres such as hair comprising in a suitable dyeing medium, at least an oxidation base selected among certain substituted paraphenylenediamine derivatives and their addition salts with an acid at least a polymer selected among amphoteric polymers cationic polymers with specific repeat structural units or amphiphilic polymers comprising at least a fatty chain and the dyeing method using said 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 March 5, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 5, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2023.
- 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.