Pressure relief valve
CA 2065224 C · Owner: Ando, Tsuyoshi · Inventors: Leng, John Leslie; Mito, Akio; Hatakenaka, Kousuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A proportional pressure release valve comprising a valve body incorporating a valve seat, a valve closure member mounted in the valve body and co-operable with the valve seat to control flow of fluid through the valve from an inlet pressure port to an outlet tank port, and electromagnetic control means having a push pin operable to move via, resilient means, the valve closure member in dependence upon the magnitude of a control current applied thereto wherein, the valve further comprises damper means provided between the push pin and the valve closure member. The valve may also comprise an anti-cavitation ring having a bore and disposed downstream of the valve seat, the anti-cavitation ring …
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 April 6, 1992 and granted December 6, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 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.