Method and apparatus for raising well fluids
CA 1185119 A · Owner: Barnard, Jack A. · Inventors: Barnard, Jack A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A piston-and-cylinder engine powered by compressed gaseous medium such as air, nitrogen, methane, helium or hydrogen supplied, at up to 20 atmospheres from a plenum via cylinder port to a face of a free piston fixed on a tubular piston rod extending through an end wall, the rod being connected to the piston of a reciprocating double-acting piston/cylinder pump raising a well fluid. A gasdistribution valve has an actuator rod formed with a shoulder which is pushed by the engine piston near the end of a stroke to energize a spring, and has a slender extension terminated in a head captive in the piston rod which is pulled by the piston near the end of its alternative stroke. At a predetermined …
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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 April 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 9, 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.