Hair coloring compositions
CA 2274841 A1 · Owner: Dias, Louis Carlos · Inventors: Dias, Louis Carlos; Pratt, Dominic; Dunbar, James Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hair coloring composition comprising: (a) an inorganic peroxygen oxidising agent; and (b) an oxidative hair coloring agent; wherin the pH of each of components (a) and (b) is in the range of from about pH 1 to about pH 4.5 and wherein the pH of the composition is in the range of from about pH 1 to about pH 4.5. The products can provide excellent hair coloring and in-use efficacy benefits including excellent initial color and good wash fastness in combination with reduced hair damage at low pH.
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 December 9, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 9, 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.