Methods and apparatus for wellbore construction and completion
CA 2708591 C · Owner: Moyes, Peter Barnes · Inventors: Giroux, Richard L.; Maguire, Patrick G.; Murray, Mark
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates methods and apparatus for lining a wellbore. In one aspect a drilling assembly having an earth removal member and a wellbore lining conduit is manipulated to advance into the earth. The drilling assembly includes a first fluid flow path and a second fluid flow path. Fluid is flowed through the first fluid flow path and at least a portion of which may return through the second fluid flow path. In one embodiment the drilling assembly is provided with a third fluid path. After drilling has been completed wellbore lining conduit may be cemented in the wellbore.
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
- Filed February 9, 2004 and granted May 1, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 9, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 9, 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.