Polysiloxane-polyoxyalkylene compositions for polyurethane foam manufacture
CA 1283993 C · Owner: Blevins, Charles Henry · Inventors: Murphy, Gerald Joseph; Blevins, Charles Henry; Herdle, William Bruce
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polysiloxan-polyoxyalkylene composition of the nominal formula:, wherein R is an alkyl group having 1 to 3 carbon atoms and R°, R', R'' and R''' are individually monovalent polyoxyalkylene polyethers attached to the silicon atom through a difunctional link; and, the polyoxyalkylene of R' is a poly- (oxypropylene-oxyethylene) ether which ontains 20% to 60% oxyethylene by weight and has an average molecular weight of from about 3,000 to about 5,500; the polyoxyalkylene of R'' is a poly-, (oxypropylene-oxyethylene) ether which contains 20% to 60% oxyethylene by weight and has an average molecular weight of from about 800 to about 2,900; and, the polyoxyalkylene of R''' is a, polyoxypropylene …
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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
- Granted May 7, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 7, 2008.
- 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.