Stuffing box for progressing cavity pump drive
CA 2711206 C · Owner: Hult, Vern · Inventors: Hult, Vern
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Progressive cavity (PC) pump drive heads require a stuffing box to seal crude oil from leaking onto the ground where the polish rod passes from the crude oil passage in the wellhead to the drive head. Using a pressurization system for the stuffing box such that the pressure output exceeds the pressure at the wellhead stuffing box seal life can be extended. Pressurization fluids are introduced between a primary rotary well fluid seal and a pressurization rotary seal. Any leakage of pressurization fluids from the pressurization rotary seal can be directed through a leak passage from the stuffing box or re-circulated through the leak passage to a source of pressurization fluid.
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 August 11, 2003 and granted September 11, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 11, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 11, 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.