Longstroke pumping apparatus for oil wells
CA 1068551 A · Owner: Bethlehem Steel Corporation · Inventors: Gault, Robert H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Invention, A longstroke pumping apparatus for oil well pumping is provided with turnaround capability and more efficient operation by the use of a two section grooved capstan arrangement from which a flexible pumping cable extends down the well and a flexible counterweight cable extends to a counterweight in a counterweight well. The first section of the capstan from which the pumping cable extends has a basically constant diameter while the second section of the rotatable capstan from which the counterweight cable extends is formed from three contiguous interconnected portions. The central portion has a substantially constant diameter and the two end portions have …
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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 December 25, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 25, 1996.
- 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.