Emulsion polymers for use in hair fixatives
CA 2118918 C · Owner: National Starch And Chemical Investment Holding Corporation · Inventors: Morawsky, Natalie; Leighton, John; Wanigatunga, Sirisoma
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is aqueous based emulsified hair fixative composition that comprises by weight (A) 2-15% of a carboxylated polymer comprising polymerized residues of (a) one or more acidic monomers; each containing one or more available carboxyl groups, present in an amount of 3-35% by weight of the polymer;(b) one more water water insoluble comonomers present in an amount of 65-95 % by weight of the polymer; (c) optionally up to 2O % by , weight of one or more water soluble monomers; and (B) an effecttve amount of a cosmetically acceptable organic or inorganic base to neutralize a sufficient proportion of the available carboxyl groupe to obtain shampoo removability of the hair fixative …
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 10, 1993 and granted October 26, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 10, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 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.