Drive head for downhole rotary pump
CA 2106658 C · Owner: Kudu Industries Inc. · Inventors: Mills, Robert A. R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drive head for a downhole rotary pump operated by a drive string rotatable in a production string includes a hollow rotatable drive shaft having an axial bore for a polished rod a housing attachable to a, wellhead assembly radial bearings centering the drive shaft in the housing and one axial thrust bearing to support the weight of the drive shaft and the drive string suspended therefrom. A pulley mounted on the shaft for the driving of the drive shaft which includes a chuck, arrangement for the concentrical clamping of the polished rod in the drive shaft. The drive head is used in combination with a polished rod clamp which is affixed to the polished rod for the suspending of the weight …
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 September 21, 1993 and granted October 14, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 21, 2015.
- 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.