Well pump
CA 1203749 A · Owner: Otis Engineering Corporation · Inventors: Canalizo, Carlos R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A well pumping system in which a production piston having a traveling valve therein is arranged in a production cylinder with a standing valve in its inlet and is reciprocated by a power piston attached to the production piston in which power for reciprocating the production system is provided by hydraulic fluid acting on the rod end of the power piston to move the piston in one direction and when the force on the power piston fluid is removed, the hydrostatic head of pressure acting on the head end of the power piston moves the pair of pistons in the opposite direction either by the power fluid having lesser weight than the production fluid or by isolating the hydrostatic head of fluid in …
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 April 29, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 29, 2003.
- 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.