Polymers of ethylenically unsaturated cyclic ortho esters
CA 2056459 A1 · Owner: Campbell, John R. · Inventors: Campbell, John R.; Shea, Timothy J.; Khouri, Farid F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Ethylenically unsaturated cyclic ortho esters are prepared by the reaction of a hydroxy-substituted cyclic ortho ester such as 4-hydroxymethyl-2-methoxy-2-methyl-1,3dioxolane with acryloyl chloride, methacryolyl chloride vinylbenzyl chloride or the like. They form polymers especially EPDM graft copolymers, which are useful in the formation of copolymer-containing compositions with polyesters, polyamides and the like. The copolymercontaining compositions have excellent physical properties and may be employed to compatibilize blends of the same polymers.
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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 November 28, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 28, 2013.
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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.