Aqueous viscoelastic fluid
CA 2434357 C · Owner: Zhou, Jian · Inventors: Jones, Timothy Gareth John; Zhou, Jian; Tustin, Gary John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns an aqueous viscoelastic fluid for use in the recovery of hydrocarbons. According to the invention the aqueous viscoelastic fluid , comprises a monomer a dimer or an oligomer of a viscoelastic surfactant able to form a viscoelastic gel under downhole conditions said surfactant , comprising a hydrophobic tail and a hydrophilic head and being of the , following formulae: R-X-Y-Z where R is the hydrophobic tail of the surfactant Z is the hydrophilic head of the surfactant said hydrophilic head being , charged, X is a stabilising group and Y chain is a linear saturated or , unsaturated, hydrocarbon chain of 1 2 or 3 carbon atoms or a branched, saturated or unsaturated …
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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 February 13, 2002 and granted June 21, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 13, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 2024.
- 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.