Polyether polyol for petroleum recovery
CA 1137740 A · Owner: Magna Corporation · Inventors: Blair, Charles M. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of recovering petroleum from a subterranean reservoir preferably comprising the st:eps of: (1) introducing through an injection well a predeterminable amount of a polyether polyol having the formula:, wherein:, A is an alkylene oxide group -CiH2iO-;, O is oxygen;, i is a positive integer from 2 to about 10 inclusive j is a positive integer no greater than about 100; k is a positive integer no greater than about 100; N is nitrogen;, R1 is one of hydrogen, a monovalent hydrocarbon group containing less than about C11, or ALH;, L is a positive integer no greater than about 100; R is a hydrocarbon moiety of a non-aromatic polyol or an aromatic polyol containing only one aromatic ring a …
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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 December 21, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 21, 1999.
- 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.