Alcohol compatible copolymer
CA 2544453 C · Owner: National Starch And Chemical Investment Holding Corporation · Inventors: Sanders, Jannifer; Holt, Stuart; Crossman, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Alcohol compatible, water-soluble copolymer useful as a corrosion inhibitor. The copolymer includes at least one olefinically unsaturated carboxylic acid monomer at least one olefinically unsaturated mono- or di-alkyl ester of a di-carboxylic acid monomer and at least one olefinically unsaturated hydrophilic non-ionic monomer. The molar ratio of the alkyl ester groups of the mono- or di-alkyl ester of the dicarboxylic acid monomer to the hydrophilic groups of the hydrophilic non-ionic monomers is from 0.01:1 to 1000:1 and the molar ratio of the sum of the alkyl ester groups and hydrophilic groups of the hydrophilic non-ionic monomers to the carboxylic acid groups is from 0.001:1 to 100:1. …
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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 April 21, 2006 and granted April 16, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 21, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
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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.