Pressure modulating and reducing valve
CA 1189424 A · Owner: Caterpillar Tractor Co. · Inventors: Blake, William W.; Coutant, Alan R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
21-, Pressure Modulating and Reducing Valve Abstract, A pressure modulating and reducing valve communicates pressurized hydraulic fluid from a pump to a hydraulically actuated clutch of a transmission at a modulated rate of pressure rise and at a reduced pressure. In order to provide a compact valve the, valve has a pressure reducing valve spool slidably nested within a sleeve member of a load piston to provide a valving action therebetween for controlling fluid flow between an inlet port, a load port and a drain port in a body. Movement of the sleeve member causes an increase in the pressure at the load port which causes the pressure reducing valve spool to move against a spring to …
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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
- Granted June 25, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 25, 2002.
- 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.