Fluid pump apparatus and valve device
CA 1338322 C · Owner: Koiwa, Yoshinobu · Inventors: Koiwa, Yoshinobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a pump apparatus in which the action of a piston draws fluid into and pumps fluid from a valve chamber, a partition is provided between the piston cylinder and the valve chamber. The partition is able to transmit the force of the piston action and for this, purpose the cylinder side of the partition contains a suitable liquid medium that transmits the actuation of the piston. A screening means is provided in a passage between the partition and the valve chamber to screen out particles in the fluid that exceed a prescribed size. The overall effect is to eliminate wear to working parts of the valve caused by entrained particles. In addition there is a valve device which prevents bounce or …
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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 May 14, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 14, 2013.
- 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.