Compatibilized internal mold release compositions for preparation of foamed and fiber-reinforced polymeric articles
CA 2057367 C · Owner: Carswell, Robert · Inventors: Carswell, Robert; Weaver, Laura B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compositions and a process for preparing a molded foamed polymeric article comprising (1) a relatively high molecular weight polyahl and a relatively low molecular weight polyol in proportions, such that the relatively high molecular weight polyahl and the relatively low molecular weight polyol are incompatible, (2) a polyisocyanate, (3) a blowing agent and (4) an internal mold release/compatibilizing agent containing (a) a metal salt of a weak acid wherein the, metal is selected from elements of the Periodic Table of the Elements having Atomic Numbers 3-5 11-14, 19-34, 37-52, 55-57, and 72-84, and (b) a compound containing at least one amine group, wherein the internal mold …
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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 10, 1991 and granted September 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 2013.
- 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.