Hydraulic system
CA 2214209 C · Owner: Danfoss A/S · Inventors: Christensen, Carsten; Dixen, Carl Christian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a hydraulic system (1) with a pressure source (2, 3) controllable via a load sensing signal a pressure sink (4), at least two working sections (6 7), each having a hydraulic consumer (8 18) and a control, valve (9, 9') with a load sensing signal connection (19 20; 19', 20') and at least one back-pressure valve (17) arranged in a tank pipe between the control valve (9 9'9, and the pressure sink (4). In such a system the pressure required from the pump in the neutral position must be as low as possible. On the other hand, however, oscillations should not occur when an, external force acts on another hydraulic consumer in the neutral position of a control valve. In the …
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 28, 1997 and granted November 21, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 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.