Hair bleaching and colouring compositions having a ph greater than ph 10 comprising cholesterol
CA 2394535 C · Owner: Unilever Plc · Inventors: Brownbill, Susan; Pearce, Matthew Leslie; Vrettou, Christina
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hair bleaching composition comprising: (a) a peroxygen compound; (b) a buffering agent; and (c) cholesterol , and/or derivatives thereof or mixtures thereof; characterised in that the pH of the composition is greater than pH 10. The composition effectively bleaches hair whilst causing less dammage than conventional bleaches.
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 November 30, 2000 and granted March 15, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 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.