Downhole polymer plug and liner and methods employing same
CA 2521523 C · Owner: Zhang, Jane Qing · Inventors: Zhang, Jane Qing; Chang, Benjamin Tai An
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of sealing an inner surface of a wellbore said method comprising the , steps of: providing a member having a preselected shape with a diametrical dimension and an axial dimension, said member being constructed of a material in which stored energy may be imparted and subsequently recovered at least in pan; subjecting said member to forces causing a reduction in said diametrical dimension and an increase in said axial dimension while imparting stored energy in said member; lowering said member into the wellbore to a desired location; and subjecting said member to conditions in the wellbore at said desired location to cause at least partial release of said stored energy and …
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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 April 5, 2004 and granted March 20, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 5, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 5, 2026.
- 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.