Low wattage, high flow electrical control valve
CA 2241660 C · Owner: Westinghouse Air Brake Company · Inventors: Carroll, John B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides an electrically activated valve assembly for control of a fluid. It has a diaphragm with a control chamber on one side and a flow barrier on the second side. Portions of a first flow passage and a second flow passage are on the second side of the diaphragm with the flow, barrier between them. When the control chamber has a relatively high pressure, the diaphragm is pressed against the flow barrier, isolating the first flow passage from the second flow passage. When the control chamber has a relatively low pressure, the diaphragm moves away from the flow barrier so, flow may occur between the first flow passage and the second flow passage. The position of the diaphragm …
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 June 26, 1998 and granted February 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2020.
- 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.