A method of selecting a preload oil pressure value for a die cushion pin pressure equalizing system of a press machine
CA 2111671 C · Owner: Kabushiki Kaisha Komatsu Seisakusho · Inventors: Kaji, Nobuyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a die cushion pin pressure equalizing system wherein a plurality of die cushion pins are vertically movably provided in a bolster of a press machine pressure equalizing, hydraulic cylinders supported by die cushions are respectively provided downwardly of the plurality of die cushion pins and the plurality of pressure equalizing hydraulic cylinders are connected to one another through hydraulic paths, so that oil pressure is applied to the pressure equalizing hydraulic cylinders and the hydraulic paths, preload oil pressure acting on the plurality of pressure equalizing cylinders is raised to thereby prevent the plungers from bottoming.
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 June 17, 1992 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2014.
- 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.