Forced closed-loop cooling for a submersible pump motor
CA 2283603 A1 · Owner: Behnke, Paul W. · Inventors: Cronin, Richard J.; Behnke, Paul W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A forced closed-loop cooling system is provided for an electric motor driven submersible pump having a motor housing containing an electric motor with a rotatable motor shaft extending therefrom, and a pump housing attached to the motor housing, the pump housing having a fluid inlet a fluid outlet, and a pump impeller mounted therein on the motor shaft. The closed-loop cooling system consists of a coolant jacket surrounding the motor housing to define an annular motor cooling chamber; an end plate interposed between the motor housing and the pump housing to define a coolant sump about the motor shaft. The coolant sump is in fluid communication with the annular motor cooling chamber and …
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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
- Filed September 27, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 27, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 27, 2021.
- 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.