Method for preparing films based on crosslinked poly(ethylene oxide)
CA 2470438 A1 · Owner: Riess, Gerard · Inventors: Ferrand, Maria; Riess, Gerard; Stamenova, Rayna
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a novel method for preparing films based on crosslinked poly(ethylene oxide). Said method comprises steps which consist in: a) dissolving said ethylene oxide polymer or copolymer alone or mixed with a water-soluble polymer, in a solvent system consisting of water an organic , solvent or a mixture with proportionate water and organic solvent content in , the presence of an efficient amount of a photoinitiator or a crosslinking agent; b) either drying the resulting solution until the solvent system is evaporated when the latter consists exclusively of an organic solvent to thereby obtain a dry film or treating the resulting film in conditions , enabling absorption …
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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 December 20, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 20, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2024.
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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.