Graft polymerization process
CA 2072301 C · Owner: Mudge, Paul R. · Inventors: Mudge, Paul R.; Wanigatunga, Sirisoma
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the emulsion polymerization of graft copolymers comprising the steps of: a) obtaining an unsaturated polymer containing terminal or pendant polymerizable functionalities; b) dissolving the resultant unsaturated polymer in an ethylenically unsaturated monomer and admixing the resultant mixture in water in the presence of a surfactant to form an aqueous pre-emulsion; c) microfluidizing the aqueous phase of (b) to obtain an emulsion containing polymer phase droplets averaging less than 0.5 µm; and d) subsequently graft polymerizing the monomer with the unsaturated polymer in the microfluidized aqueous phase using free radical polymerization techniques.
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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 June 25, 1992 and granted February 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2014.
- 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.