Control method and control apparatus for a construction machine
CA 2250899 C · Owner: Ono, Tomoaki · Inventors: Ono, Tomoaki; Tozawa, Shoji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A technique for controlling a construction machine in which an articulated arm mechanism installed in a construction machine body is driven by a cylinder actuator connected to a hydraulic circuit having pumps (51 52) capable of , varying its discharge pressure depending upon the manipulated variable by an operating member (8) and operated by the discharge pressures of the pumps (51 52). By keeping the discharge pressures of the pumps (51 52) above , predetermined values even when the operating member (8) is at a non-driving position of the cylinder actuator, it is possible to suppress the response delay and the increase in dead zones of the pumps (51 52) even immediately , after the …
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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 November 28, 1997 and granted May 20, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 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
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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.