Piston structure of pressure reducing valve
CA 1294513 C · Owner: Oike, Tadashi · Inventors: Yokoyama, Takeshi; Oike, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A piston structure for a pressure reducing valve in which a piston is formed on the side surface with an annular groove for disposing a piston ring therein. The piston is slidably inserted into a cylinder along with the piston ring. A main valve is operatively opened and closed by regulating the operating pressure of the piston through a pilot valve that detects operatively the secondary pressure. The outer peripheral edge of the upper surface of the piston is located in the outer peripheral direction contained within an axial projection of point located on the inner surface of the annular groove to prevent the upper corner of the piston from colliding with the inner wall of the cylinder …
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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 January 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 21, 2009.
- 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.