Lock mandrel for downhole assemblies
CA 2113468 C · Owner: Petroline Wellsystems Limited · Inventors: Mchardy, Colin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A locking mandrel is provided for use in downhole assemblies and comprises a cylindrical body (12) having an annular series of openings (20) in which locking keys (21) are movably positioned the keys (21) being biassed, radially inwardly and an inner mandrel (13, 14) for moving the keys (21) from awithdrawn primed condition to an extended set position. Additionally the body (12) includes a series of movable no-go members (22) below the keys (21) which are extended in said primed condition so as to be engageable with a no-go ring (R2) on a downhole tubing string to axially arrest the body. The outer surface of the inner mandrel (13, 14) is suitably profiled and the arrangement, is such that …
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 August 19, 1992 and granted June 23, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 19, 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.