Functional polymers bearing non-metal oxyacid derivatives on dimethylene spacers
CA 2222833 A1 · Owner: Stranix, Brent R. · Inventors: Darling, Graham D.; Stranix, Brent R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Many spacer-containing functional polymers were produced by modifying beads of (vinyl)polystyrene, as obtained by free-radical suspension polymerization of commercial 55:45 divinylbenzene:ethylstyrene mixture, or from commercial sources. Thus in the presence of, free-radical initiators compounds HBr, HPR2, HP(OR)2 and HSR (R = various alkyl aryl or acyl, some also containing further -COOH/R -OH/R, -SH/R, -N(H/R)2 groups) underwent anti-Markovnikov addition to the residual vinyl groups. Similar free-radical functionalization with various HSiR3 also proved feasible but more difficult. Other products corresponding to formal anti-Markovnikov addition of H2S, HSO3- HP(OH)2, H2, HBR2, HOH and …
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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 28, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 28, 2019.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.