Vinyl halide polymers modified with olefinic nitrile polymers
CA 2069918 A1 · Owner: Braden, Thomas C. · Inventors: Perry, Scott; Braden, Thomas C.; Kline, Sally A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Vinyl halide polymer compositions exhibiting reduced gas permeability are described which comprise a mixture of (A) at least one vinyl halide polymer; and (B) from about 1 to about 40 parts by weight per 100 parts of vinyl halide polymer (A) of at least one olefinic nitrile polymer. The vinyl halide polymers preferably are vinyl chloride homopolymers and copolymers and the olefinic, nitrile polymers are copolymers of an olefinically unsaturated nitrile such as acrylonitrile and one or more monomers from the group of conjugated dienes, monoolefins, olefinically unsaturated carboxylic acid esters, and vinyl aromatic compounds. The olefinic nitrile polymer can be chosen or manufactured to …
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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 October 26, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 2012.
- 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.