Amplified pressure air driven diaphragm pump and pressure relief valve therefor
CA 2255757 C · Owner: Wilden Pump And Engineering Company · Inventors: Kennedy, Dennis Earl; Pascual, Wilfred David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air driven diaphragm pump having two opposed pumping cavities (26). A center section assembly (104) between the pumping cavities includes a cylinder (108) and a power amplifier piston (124). The power amplifier piston as well as the diaphragms (88) are coupled with a common control shaft (116). A valve assembly (138, 144) is arranged with a manifold (162) to receive pressurized air and distribute that air in alternating fashion to the sides of the power amplifier piston as well as to each of the diaphragms. By directing pressure to a side of the power amplifier piston facing the same direction as the diaphragm receiving pressure, an amplified pressure on a pump chamber is …
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 May 1, 1997 and granted April 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 1, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 2019.
- 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.