Preparation of poly(aryl ether/thioether)-polyester block copolymers
CA 2002086 A1 · Owner: Woo, Edmund P. · Inventors: Woo, Edmund P.; Mullins, Michael J.; Murray, Daniel J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel poly(aryl ether/thioether)-polyester block copolymers are prepared by reacting a polyester with a poly(aryl ether/thioether) having at least one electron-withdrawing group located in a position ortho or para to its ether/thioether linking group in the, presence of an exchange catalyst. The copolymers of the present invention exhibit high temperature stability and excellent thermoplastic engineering properties as well, as superior solvent resistance making them particularly, suited for producing molded plastic components for the automotive and eletrical housings markets. 37,080-F
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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 2, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 2, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 2, 2011.
- 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.