Block copolymer of polyalkylene and halogenated poly(vinyl aromatic)
CA 2049834 A1 · Owner: Hoxmeier, Ronald J. · Inventors: Hoxmeier, Ronald J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A block copolymer is provided having the general formula S'-A-(A-S')m, in which m is 1, 2, 3 or 4 A is a polyalkylene block and S' is a, nuclear brominated and/or chlorinated poly(vinylaromatic) block having from 0.5 to 5 bromines and/or chlorines per aromatic ring. The polyalkylene block is substantially free of halogen. The block copolymer is prepared by polymerizing the monomers hydrogenating, the formed polymer in the presence of a hydrogenation catalyst and subsequently halogenating the hydrogenation catalyst and the hydrogenated polymer, all steps successively being carried out in the same, inert solvent. The compositions retain the elastomeric properties of the non-halogenated form …
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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 August 26, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 2013.
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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.