Dual tubing string hanging apparatus
CA 2175641 C · Owner: Robbins & Myers Canada, Ltd. · Inventors: Wright, Andrew; Ring, Curtis Phillip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for hanging a production tubing string and a guide string within a well casing having a wellhead. The apparatus includes a primary hanger shell for supporting the production tubing string and guide string in the well casing a, production mandrel received within the primary hanger shell and connected to theproduction tubing string to hang the production tubing string within the primaryhanger shell and guide string hanging means connected to and hanging the guide string within the primary hanger shell. The guide string hanging means also allows the guide string to be removed from the well casing independently from the removal of the primary hanger shell, the production mandrel or …
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 2, 1996 and granted May 14, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 2, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 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.