Composition for oxidation staining of keratin fibres and production process
CA 2210367 C · Owner: Audousset, Marie-Pascale · Inventors: Audousset, Marie-Pascale
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a composition for oxidation staining of keratin fibres including 2-amino 3-hydroxy pyridine as a first coupler in association with an oxidation base chosen from among formula (I) paraphenylenediamines and/or formula (II) para-aminophenols and a second coupler chosen from among formula (III) meta-aminophenol derivatives and the staining process producing this composition with an oxidating agent.
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 July 18, 1997 and granted January 28, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 18, 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.