Anti-rotation tool
CA 2238910 C · Owner: Laclare, G. Maurice · Inventors: Kobes, Michael; Laclare, G. Maurice
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An anti-rotation device prevents righthand rotation of a tubing string within a stationary well casing. The device includes a tubular housing connected, inline with the tubing string. A fixed jaw configured for gripping the well casing, projects outwardly from the housing. A pair of collars free to rotate about the, housing support two floating jaws which are also configured for gripping the well, casing. The floating jaws rotate about the housing between a free position in which, the floating jaws are positioned adjacent the fixed jaw and the overall diameter of the, device is less than the diameter of the well casing and an engaged position with the, floating jaws and the fixed …
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 May 28, 1998 and granted December 4, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 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
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.