Stable foams and methods of use
CA 1185778 A · Owner: The Dow Chemical Company · Inventors: Ainley, Brian R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Enhanced foams are described which comprise: an aqueous medium, a surfactant, a gas a heteropoly-, saccharide, and a water soluble inorganic salt. For example, a foam fracturing fluid was prepared by foaming an aqueous solution of a xanthan gum, KCl and a commercial blend of surfactants with nitrogen. This foamed fracturing fluid had excellent proppant carrying capacity low, fluid loss, and excellent stability even at elevated temperatures. -29-
Read the whole patent
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 April 23, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 23, 2002.
- 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.