Mixtures of poly(alkylene carbonate) polyols and polymers of ethylenically unsaturated esters
CA 2004392 C · Owner: Prier, Donald G. · Inventors: Prier, Donald G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Modified mixtures of poly(alkylene carbonate) polyols and polymers of certain unsaturated esters are prepared by, (A)forming a mixture of a polymer of an ethylenically unsaturated ester and a polyalkylene carbonate polyol and, (B)subjecting such mixture to conditions sufficient to induce a transesterification reaction between the polymer of an acrylic ester and a polyalkylene carbonate polyol.
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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 1, 1989 and granted November 14, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 1, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 2011.
- 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
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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.