Keratin fibre dye composition containing pyrazolo-pyrimidineoxo compounds, use thereof as dye couplers, and dyeing methods
CA 2249467 A1 · Owner: Vidal, Laurent · Inventors: Malle, Gerard; Vidal, Laurent
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition for dyeing keratin fibres particularly human hair, consisting of a medium suitable for use in dyeing and containing as the coupler, at least one compound of formula (I) or an acid addition salt thereof, wherein R¿1? is particularly hydrogen alkyl, aryl, a heterocyclic ring, halogen etc. R¿2? is particularly hydrogen, halogen alkoxy, aryloxy, acyloxy, arylthio, alkylthio etc. R¿3? has the same meaning as R¿1? and each of Za and Zb, which are different is C=O or CR¿4?, where R¿4? has the same meaning as R¿1? as well as at least one oxidation base is disclosed.
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 21, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 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.