Improved process for particle circulation in a porous medium
CA 2068223 C · Owner: De Farcy De Malnoe, Jacques-Philippe · Inventors: Putz, Antide; Sardin, Michel; De Farcy De Malnoe, Jacques-Philippe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The purpose of the invention is an improved process for injecting and transporting small-sized particles in a natural porous medium. The process is characterized by a first phase wherein the porous medium is conditioned with an aqueous solution containing a hydrocarbonic polymer or surfactant compound, a second involving injection of a plug of particles suspended in an aqueous solution containing at least one hydrocarbonic polymer or surfactant compound, and a third wherein the plug of particles is propelled by a suitable aqueous medium. The process is notably useful for establishing bacteria in a porous medium.
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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 November 9, 1990 and granted October 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2012.
- 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.