Method and apparatus for controlling reactive torque on a drill string while drilling
CA 2237309 C · Owner: Tartan Completions Systems Inc. · Inventors: Honan, Hugh Michael; Laird, William; Mcgillivray, Miles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for controlling reactive torque on a drill string while drilling. The apparatus includes a housing and a tubular mandrel. The housing has a flow passage extending therethrough. The tubular mandrel is rotatably mounted to the housing coaxially with an outlet of the fluid flow passage. Fluids exiting through the outlet of the fluid flow passage pass through the tubular mandrel. A ratchet mechanism is used for controlling rotation of the tubular mandrel so that the tubular mandrel rotates freely in a clockwise direction and does not rotate in a counterclockwise direction. In accordance with the method the apparatus is, suspended from a service rig with a drill string …
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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 May 8, 1998 and granted June 22, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 8, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 8, 2020.
- 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
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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.