Emulsifier compositions for applying silicone oil to hair
CA 2131029 C · Owner: Alberto-Culver Company · Inventors: Mariahazy, Andrea E.; Wood, James L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid hair care composition for conditioning hair with silicone oil comprises a stable emulsion of a water-insoluble hair conditioning silicone oil dispersed in a polyoxyalkylene glycol liquid carrier containing an effective emulsifying amount of a complex formed from (i) an anionic copolymer of dimethylpolysiloxane and polyoxethylene wherein the siloxane chain contains from 20 to 40 dimethylsiloxy units and the oxyethylene chain contains from 3 to 15 oxyethylene units and terminates in an anionic phosphate or sulfate group, and (ii) a cationic hair conditioner compound containing at least one cationic quaternary nitrogen or amido amino group and at least one hydrophobic aliphatic or …
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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 19, 1993 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2015.
- 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.