Methods for expanding threaded tubulars
CA 2759774 C · Owner: Weatherford/Lamb, Inc. · Inventors: Duggan, Andrew Michael; Harrall, Simon John; Simpson, Neil Andrew Abercrombie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods for expanding threaded tubulars to prevent separation thereof. In a first aspect, a method for expanding a threaded coupling comprises forming a threaded coupling by threadly connecting a first tubular to a second tubular, wherein a nose portion on the first tubular is spaced apart from a groove portion on the second tubular at a first axial distance; and expanding the threaded coupling with an expander tool, causing the threads to form an interference therebetween and causing the groove portion to accommodate any axial extension of the first tubular due to expansion thereof such that the nose portion is spaced apart from the groove portion at a second smaller axial …
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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 July 3, 2003 and granted November 24, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 3, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 3, 2025.
- 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.