Soft compounds derived from polypropylene grafted disubstituted ethylene-maleimide copolymers
CA 2270312 A1 · Owner: Mashita, Naruhiko · Inventors: Mashita, Naruhiko; Lawson, David F.; Wang, Xiaorong
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The instant invention teaches a method for enabling the formation of a high damping, soft, polymer gel. The method includes: reacting a poly(disubstituted ethylene-comaleimide) polymer, with a maleated polyalkylene and an alkyl diamine under substantially dry conditions sufficient to, form a polyalkylene grafted poly(disubstituted ethylene-co-maleimide) polymer product; and, dispersing the polyalkylene grafted poly(disubstituted ethylene-co-maleimide) polymer product, with an extender oil sufficient to form the gel. The instant invention also contemplates a polymer, gel composition a polymer composition and an article manufactured from the polymer gel, composition.
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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
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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.