Downhole force generator
CA 2034962 C · Owner: Halliburton Company · Inventors: Kilgore, Marion D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydraulic well tool is provided for running into a flow conduit of a well on a handling string such, as reeled tubing or jointed pipe for generating and, applying an axial force to an object in the well. The tool is anchored in the flow conduit by an anchoring mechanism actuatable by fluid pressure in the handling string and it also includes a piston/cylinder arrangement that is actuatable by fluid pressure in the handling string for moving the object. The tool may be provided with means to permit increasing the fluid pressure for actuation of the anchoring mechanism and the piston/cylinder arrangement. Such means including flow restrictors ball valves, velocity check valves and plugs. …
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 January 25, 1991 and granted November 18, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 2013.
- 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.