Unitary diversionary-tubing hanger and energizable rod seal
CA 2210698 C · Owner: Reed, Lehman Thoren · Inventors: Reed, Lehman Thoren
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A unitary diversionary-tubing hanger (30) or UDTH, for attachment to a wellhead (47) that functions as a tubing hanger a diverter of flow from the vertical to the horizontal or vice versa and a securing device (38) for a removable vertical seal plug (40) and a recoverable emergency energizable vertical rod seal (130). The UDTH (30) simplifies wellhead completion by eliminating all valves in the vertical string. The UDTH (30) can also pass through a blowout protector attached to a wellhead (47). A recoverable energizable vertical rod seal (130) installable in the vertical passageway (55) of the UDTH (30) provides an emergency pump rod seal (130) in a wellhead (47) completed for rod pumping …
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 January 16, 1996 and granted October 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 16, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 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.