Keyless latch for orienting and anchoring downhole tools
CA 2180048 C · Owner: Comeau, Laurier E. · Inventors: Comeau, Laurier E.; Vandenberg, Elis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A joint of tubular casing with a pre-formed window in its sidewall has a tubular sleeve fixedly attached to the interior of the tubular casing by a plurality of shearable set screws. The exterior surface of the sleeve is sealed to the interior surface of the tubular casing on opposing sides of the window. The window is filled with a fluid and then the window is covered with one or more layers of a composite material such as fiberglass. In use the joint of tubular casing is run down to the depth of interest in an earth borehole and then the window is oriented with respect to the formation of interest at the depth. The joint of tubular casing is then cemented in place after which the tubular …
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 June 27, 1996 and granted October 24, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 27, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2018.
- 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.