Pumping unit
CA 1286152 C · Owner: Mestieri, Renzo · Inventors: Mestieri, Renzo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pumping unit particularly for pumping oil from an oil bore has an inner stationary cylinder unit and an outer cylinder unit reciprocatable relative to the inner unit by hydraulic fluid; the units are enclosed in a casing and the outer unit functions as a piston in the casing; as the outer unit moves downwardly in the down-stroke under the, action of gravity and hydraulic fluid air in the, casing beneath it is displaced into a reservoir to form a supply of pressurized air; in the upstroke the supply of pressurized air is exploited to drive the outer cylinder upwardly, aided by the hydraulic fluid.
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 July 16, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 16, 2008.
- 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.