Liner wiper plug apparatus and method
CA 2211228 A1 · Owner: Fraser, James M. Iii · Inventors: Stringfellow, Steven W.; Fraser, James M. Iii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method are disclosed for pumping segregated through atubular member such as is required when cementing a liner into a well bore. A liner wiper plug has an internal bore formed therethrough with a flapper valve mounted in, the liner wiper plug. The flapper valve can pivot to an open position to allow fluid flow through the wiper plug, and the flapper valve can pivot to a closed position to prevent fluid flow through the wiper plug. A work string or a stinger attached to a, work string can be positioned within the internal bore to the wiper plug holding the, flapper valve in the open position. The wiper plug can be run into the well on the work string, with the flapper valve …
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 July 23, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 23, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2019.
- 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.