Hair colouring compositions
CA 2527993 C · Owner: Marsh, Jennifer Mary · Inventors: Clarke, Colin John; Marsh, Jennifer Mary
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to hair colouring and bleaching compositions comprising i) at least one source of peroxymonocarbonate ions ii) at least , one alkalizing agent, preferably a source of ammonium ions and iii) at least , one radical scavenger wherein said composition has a pH of up to 9.5 which , provide a high level of lift and lightening and the required dye deposition and grey coverage whilst reducing the concentration of peroxide the ammonia , odour and reducing the hair fibre damage.
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 June 1, 2004 and granted August 7, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 1, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 1, 2026.
- 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.