Pneumatic diaphragm valve and method for controlling a pneumatic valve actuator
CA 2423350 A1 · Owner: Tanner, Douglas J. · Inventors: Lafler, Lawrence; Tanner, Douglas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The application relates to a pneumatically actuated pneumatic valve (46) having a housing (62, 64, 66) with supply (70) exhaust (72) and pilot , pressure (88) ports and a piston (82) confined between first (84) and second (76) diaphragms and slidable in the housing to be operated by the supply and pilot pressure in order to open or close a flow path (74) between supply and exhaust port, the second diaphragm in the closed valve position being pressed against a respective valve seat by elevated pilot pressure acting on the piston. Moreover a method of controlling a pneumatic valve actuator including the use of such a valve (46) is described.
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 July 24, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 24, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 2024.
- 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.