Submersible motor-driven pump with float switch
CA 2213765 C · Owner: Genz, Otto · Inventors: Genz, Otto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Liquid level-controlled submersible motor-driven pumps use so-called float switches which are capable of movement in the direction of buoyancy and enable or disable the power supply to the pump motor via a switching element depending on their, position. To this end it is customary to use float switches, which are capable of moving roughly along a reference circle on the pump housing with the aid of flexible cables. In another configuration, floats are used which actuate a switch located in the pump housing. These pumps are consequently comparatively expensive and difficult to test, in that there may be an electrical or mechanical fault either in the pump circuitry or in the pump motor …
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 August 20, 1997 and granted October 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2019.
- 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.