Annulus isolation valve
CA 2430724 A1 · Owner: Makar, Dennis · Inventors: Thompson, Gary; Makar, Dennis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved downhole tool apparatus and method for injection and production of steam that allows a packer to remain set while steam is injected into the annular, area of a wellbore, or while steam is produced through the annular area of the wellbore. As steam is injected to into the annular area or produced through , the, annular area oil and gas production may take place through the center bore of the apparatus. The apparatus also allows closure of the annulus and the center bore in order to conduct well repairs. The apparatus allows production from adjacent wellbores to continue while repairs are made in a problem wellbore. The apparatus is retrievable.
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 June 3, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 3, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 3, 2025.
- 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.