Hydraulic oil pump
CA 1196547 A · Owner: M.E.F. Holdings Ltd. · Inventors: Fraser, Morris E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1-, Abstract:, A jack pump of the type used to pump crude oil from oil wells. The jack pump comprises a reciprocating hydraulic motor fox operating sucker rods extending down the well to a down hole pump. The motor has a power stroke for lifting the sucker rods and a dissipating stroke allowing the sucker rods to fall again. The jack pump includes a variable displacement hydraulic pump a, gas-charged accumulator, a reservoir for hydraulic fluid and a hydraulic flow control circuit connecting the motor pump, accumulator and reservoir. The flow control circuit allows the jack pump to operate as follows. During the power stroke of the hydraulic motor, pressurized fluid flows from the …
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
- Granted November 12, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2002.
- 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.