Wellhead equipment that use polymer sealing elements to seal off well pressure
CA 2227399 C · Owner: Wiedemann, Jim Lee · Inventors: Wiedemann, Jim Lee
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Wellhead equipment includes a body having a drilling conduit passage whereby drilling conduit is passed through the body. Polymer sealing elements are disposed within the body and disposed in relation to the passage to seal off well pressure. A circulation passage extends through the body in the vicinity of the polymer sealing elements. The circulation passage has an inlet and an outlet whereby warm fluid is circulated through the circulation passage from the inlet to the outlet thereby raising the temperature of the polymer sealing elements to improve their cold weather performance.
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 20, 1998 and granted March 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 20, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 2020.
- 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.