Downhole stabilisers
CA 1329931 C · Owner: Anderson, Charles Abernethy · Inventors: Anderson, Charles Abernethy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Downhole Stabilisers", There is described a directional downhole stabiliser for use in a drill string. The stabiliser has an effective diameter which is selectively variable between a minimum diameter and a maximum diameter depending on the load on the drill string. The effective diameter is determined by radially movable spacers which are caused to move radially on relative movement of a mandrel which telescopes within the stabiliser casing and which has cam surfaces which engage the radial spacers. The telescopic movement of the mandrel within the casing is controlled via a mechanical detent arrangement which is actuated by the compressive force on the stabiliser.
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
- Granted May 31, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2011.
- 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.