Retrievable bridge plug and a running tool therefor
CA 2107210 C · Owner: Zwart, Klaas Johannes · Inventors: Zwart, Klaas Johannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tool (10) for downhole use in oil and gas wells comprises a number of relatively-axially-slidable members (32,34,40). Upper and lower toothed locking slips (26,28) are mounted on respective upper and lower members (40,32) and a resilient ring member (24) is mounted on a further member between (34) the locking slips (26,28) and is compressible into sealing engagement with a bore wall on relative movement of the slips (26,28) towards each other. The locking slips (26,28) are moved into radially extended bore wall engaging positions by relative axial movement of the respective members (32,40) and the central member (34). The upper and lower locking slips (26,28) are extended by application …
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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 3, 1992 and granted June 15, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2014.
- 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.