Interpolymer dispersions from vinyl esters of branched chain carboxylic acids and ethylenically unsaturated acids and/or their esters
CA 2044831 A1 · Owner: Gerets, Carine H. P. · Inventors: Van Kerckhove, Marc M. J. M.; Gerets, Carine H. P.; Andre, Olivier L. P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hydroxyl groups and carboxyl groups containing interpolymers, obtainable by radical solution polymerization of:, (a) hydroxyalkyl esters of ethylenically unsaturated acids;, (b) an ethylenically unsaturated acid such as specified hereinbefore, in an amount of from 4 to 20 %wt, calculated relative to the weight of the complete monomer mixture;, (c) alkyl esters of ethylenically unsaturated acids; (d) VeoVa 9 (a trademark), optionally mixed with VeoVa 10 (a trademark); and, (e) alkyl esters of methacrylic acid and/or acrylic acid. C11/T0818FF
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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 18, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 2013.
- 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
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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.