Automatic pressurized reservoir bleed valve
CA 2095274 C · Owner: Pall Corporation · Inventors: Cencula, Michael A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An automatic bleed valve 34 for bleeding air from a pressurized liquid reservoir includes a piston 4 in a piston chamber 25 located in a flow channel leading from the reservoir. A first orifice 6 is provided in a piston passage 24 through the piston 4, and the piston 4 is urged upstream by a resilient spring 8. A second orifice 16 is located in the flow channel. When gas is expelled from the reservoir the resilient spring 8 will retain the piston 4 in an equilibrium region, allowing the gas to be bled from the reservoir through the flow channel. When liquid beings to flow through the flow channel the pressure differential over the piston 4 increases causing the piston 4 to move against a …
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 30, 1993 and granted August 11, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2015.
- 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.