Polysiloxane copolymer useful for hair treating
CA 2021898 A1 · Owner: American Cyanamid Company · Inventors: Villamarin, Arturo A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel composition useful to impart semipermanent properties of conditioning, body and set holding, through repeated hair shampooing; comprising a blend of two reactive silicone polymers as oil-in-water emulsions in acid media, wherein the silicone polymers are a hydroxy terminated dimethyl polysiloxane having the general formula, where n is not less than 500 and, where n is from 15 to 50.
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 July 24, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 2012.
- 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.