Stuffing box for progressing cavity pump drive
CA 2397360 A1 · Owner: Hult, Vern Arthur · Inventors: Hult, Vern Arthur
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. Because crude oil typically contains fine, sand particles, alignment between the stuffing box and the polished rod is imperfect, and PC drive heads run continuously it is very difficult make stuffing boxes that last as, long as desirable by oil production companies. By using a flexibly mounted standpipe, in various configurations, around which is a bearing supported shaft carrying the, sealing means, long term durability of the stuffing box can be achieved. By using a, pressurization …
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 9, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 9, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2024.
- 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.