Olefin sulphonate composition
CA 1248340 A · Owner: Shell Canada Limited · Inventors: Craven, Sheila M.; Fernley, George W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides olefin sulphonate compositions comprising an aqueous solution containing 15 to 35 %w of a blend of (a) C12-22 linear alpha-olefin sulphonate and (b) alkyl aryl sulphonate of general formula (I), where n is o, 1 or 2, R is a C8-C18 alkyl group and M is an alkali metal or ammonium ion, the weight ratio (a):(b) being in the range 90:10 to 60:40; and use of such compositions in foam drive processes of enhanced oil recovery.
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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 January 10, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 10, 2006.
- 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.