2-hydroxy-5-aminobiphenyl derivatives and oxidative hair dyes containing these compounds
CA 2383577 A1 · Owner: P&G-Clairol, Inc. · Inventors: Braun, Hans-Jurgen; Chassot, Laurent
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an oxidative colouring agent for keratin fibres in , particular hair, based on a developing agent-coupling agent combination which , contains as a developing agent at least one 2-hydroxy-5-amino-biphenyl derivative of general formula (I), in addition to novel 2-hydroxy-5-aminobiphenyl derivatives.
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 10, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 10, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2023.
- 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.