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Expired Canadian patentCanada

Ampholyte terpolymers providing superior conditioning properties in shampoos and other hair care products

CA 2072185 C · Owner: Lubrizol Advanced Materials, Inc. · Inventors: Vaughan, Craig W.; Chen, Shih-Ruey T.

CIPO record

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Abstract From the Canadian patent

Ampholyte terpolymer conditioning additives for hair care products are disclosed which improve wet and dry hair combability, especially detangling and reduced static flyaway, sheen, and fixative properties, especially curl retention. The ampholyte terpolymers may have a weight average molecular weight of from about 10 thousand to 10 million and, comprise (a) from at least 1 to as much as 95 weight percent of a nonionic monomer, (b) from at least 5 to as much as 80 weight percent of a cationic monomer and (c) from at least 1 to as much as 75 weight percent of an anionic monomer. In a preferred embodiment, the amount of the cationic and anionic components is such that the overall % net charge …

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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 June 23, 1992 and granted October 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 23, 2012.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2014.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 23, 1992
GrantedOctober 1, 2002
Term endedJune 23, 2012
Patent numberCA 2072185 C
Classification (IPC)A61K8/81 +2 more

Timeline

Timeline From CIPO dates

1993199519971999200120032005200720092011Application filedJune 23, 1992Patent grantedOct 1, 2002Term endedJune 23, 2012

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.