Cationic methylenedioxy benzenes, their use for oxidation dyeing of keratin fibres, dyeing compositions and methods
CA 2322990 A1 · Owner: L'Oreal · Inventors: Genet, Alain; Lagrange, Alain
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns novel methylenedioxy-benzenes comprising at least a cationic group Z Z being selected among quaternized aliphatic chains aliphatic chains comprising at least a saturated quaternized cycle and aliphatic chains comprising at least an unsaturated quaternized cycle their use as oxidation dye precursors for oxidation dyeing of keratin fibres dyeing compositions containing them, and dyeing methods using them.
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 January 14, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 14, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 14, 2022.
- 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.