In situ solvent free method for making anhydride based graft copolymers
CA 2266255 A1 · Owner: Peach State Labs, Inc. · Inventors: Rodrigues, Klein A.; Moss, Thomas H. Iii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In situ solvent free methods for making anhydride based graft copolymers which involve mixing an ethylenically unsaturated monomer an, anhydride monomer, either a monofunctional polyglycol having a hydroxyl or amine terminal group or a polyfunctional polyglycol having a weight average molecular weight of greater than 5,000 and at least one terminal hydroxyl group, and a free radical initiator to form a mixture. The mixture is heated to form a, copolymer having repeat units derived from the ethylenically unsaturated monomer and anhydride monomer, and a copolymer grafted polyglycol comprising a main polyglycol backbone having copolymer side chains which are heated to form an anhydride based …
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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 March 23, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 23, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 23, 2021.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.