Hydraulic pressure regulator
CA 2075371 C · Owner: Schiefer, Rolf · Inventors: Schiefer, Rolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is a hydraulic pressure regulator with automatic self-relief. A control piston disposed in a regulator housing between an inlet pressure chamber and an outlet pressure chamber for a hydraulic medium is adapted to be doubly acted upon. The inlet pressure of the hydraulic medium to be regulated on the one hand and a resilient control pressure force on the other hand act on the control piston. The control piston has on its side towards the inlet pressure a smaller piston surface on a lower projecting piston part and a larger piston surface provided on an upper piston part. The lower piston part has a flow duct for the hydraulic medium which opens beneath the, larger piston surface …
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 December 2, 1991 and granted October 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 2, 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.