Copolymers of ethylene and geminally disubstituted olefins
CA 2248767 C · Owner: Shaffer, Timothy D. · Inventors: Canich, Jo Ann M.; Shaffer, Timothy D.; Squire, Kevin R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Substantially random ethylene copolymers containing at least 3.0 mole percent of geminally disubstituted olefin monomers are described. The geminally disubstituted olefin monomers can be represented by the generic formula R1 = R2(R3)(R4), where R1 is CH2, R2 is C, and R3 and R4 are independently, essentially linear hydrocarbyl groups having from 1 to 30 carbon atoms or , more, and containing one carbon atom bound directly to R2. The copolymers can be prepared by coordination polymerization by means of contacting at least one geminally disubstituted olefin monomer and ethylene optionally with one or , more other coordination polymerizable monomers with a catalyst system , comprising a …
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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 May 21, 1997 and granted January 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 2019.
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Timeline
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.