A simplified sealing and anchoring device for a well tool
CA 2218917 C · Owner: Pringle, Ronald E. · Inventors: Pringle, Ronald E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A resilient sealing element (26) is adapted for connection to a well tool with an integral anchoring device, such as a slip (28) embedded therein. When , compressive forces are applied thereto the sealing element (26) compresses and moves its outside diameter and the slip (28) into sealable engagement with the inside wall of a well tubing or casing (42). Releasing the sealing and anchoring element is accomplished by applying tension to a wire (22) which passes longitudinally therethrough to cause retraction of the slip.
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 April 16, 1996 and granted September 4, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 16, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 2018.
- 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.