Internal gear pump for wide speed range
CA 2115795 C · Owner: Harle, Hermann · Inventors: Eisenmann, Siegfried A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an internal gear pump, which can also be constructed as pump with suction control to reduce the undesired cavitation effects in the pressure region and to permit the oil to flow off from the diminishing displacement cells between the teeth of the gears and impedance-controlled overflow passage is provided the openings of which towards the moving displacement cells are alternately opened and closed by the teeth of at least one of the gears.
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 February 16, 1994 and granted April 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 16, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2016.
- 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.