Gels derived from extending grafted comb polymers and polypropylene via a solution synthesis
CA 2270310 A1 · Owner: Wang, Xiaorong · Inventors: Wang, Xiaorong; Hogan, Terrence E.; Lawson, David F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention teaches a method for enabling the formation of a high damping, soft, polymer gel. The method includes: reacting in a suitable solvent a poly(alkenyl benzene-co-malefic, anhydride) and a primary amine to form a poly(alkenyl benzene-co-maleimide) polymer. The poly(alkenyl benzene-co-maleimide) polymer while remaining in solvent is grafted with a, maleated polyalkylene through the use of a grafting agent such as an alkyl diamine to form a, polyalkylene grafted poly(alkenyl benzene-co-maleimide) polymer product. The solvent is then, removed from the polyalkylene grafted poly(alkenyl benzene-co-maleimide) polymer product and, the polymer is mixed with extender such …
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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 28, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 28, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 28, 2021.
- 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
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.