Hair treatment method
CA 2282674 A1 · Owner: Duvault, Yolanda · Inventors: Malle, Gerard; Duvault, Yolanda; Leroy, Frederic
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for treating hair keratin fibres to provide them with new appropriate properties comprising the following steps: reducing the sulphur bonds of hair keratin to generate only at the surface of the fibres at a depth less than 10 µm. reactive sites and in fixing covalently on said reactive sites at least one active compound for providing the hair keratin fibres with new appropriate properties said active compound containing at least a reactive function capable of reacting with said reactive sites formed at the keratin fibre surface. This method is applicable to the treatment of fibrous or non-fibrous keratin substances of human or animal origin.
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 4, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 4, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 4, 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.