Shifting tool for sliding sleeve valves
CA 2115702 C · Owner: Halliburton Company · Inventors: Collins, Leo G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shifting tool for sliding sleeve valves used in oil or gas wells the tool having, locating dogs for selectively locating and engaging a shoulder inside the valve; primary keys for engaging and selectively shifting the sliding sleeve to the equalizing position and, for preventing premature shifting of the sliding sleeve to the fully open position; means for selectively overriding the preventing means following equalization of pressure across the port; secondary keys leading the primary keys in the shift direction for engaging and selectively shifting the sliding sleeve to the fully open detent position; and means for selectively disengaging the shifting tool from the sliding sleeve valve …
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 February 15, 1994 and granted March 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 15, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 2016.
- 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.