Pumping system
CA 2035091 C · Owner: Hulinsky, Raymond · Inventors: Hulinsky, Raymond; Carson, Douglas Timothy; Wright, Paul George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To meter liquid pumped from a well through a long tube, changes in the strain in a portion of the tube carrying the liquid are measured and used to determine when the liquid has reached the portion. Pumping cycles are counted to determine the amount of liquid that flows past the portion. The determination is based on an increase in the amplitude of the pulses indicating liquid is approaching the pump. Gaps in the pulses may be sensed and accounted for in the measurements.
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
- Filed January 28, 1991 and granted April 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 28, 2013.
- 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.