Keratinous fibre oxidation dyeing compositions containing a laccase and dyeing method using same
CA 2318308 A1 · Owner: L'Oreal · Inventors: Lang, Gerard; Cotteret, Jean
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 oxidation composition for dyeing keratinous fibres in particular human keratinous fibres such as hair comprising in a medium suitable for dyeing, at least one oxidation colouring agent at least an acid direct colouring agent comprising in its structure at least a sulphonic function or at least a carboxylic function and at least an enzyme such as laccase as well as 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 December 21, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2020.
- 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.