Pressure relief valve with pneumatic pilot
CA 2249266 C · Owner: Westinghouse Air Brake Company · Inventors: Cunkelman, Brian L.; Santoro, Ralph Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pressure relief valve for rapidly exhausting air pressure from a source of such pressure. The valve includes a housing containing a valve member located across a main port provided in the housing that directly receives the air pressure from the pressure source. A second port is provided for receiving a pilot pressure from the pressure source and a, piston is located adjacent the second port. At least one exhaust port is provided in the housing for exhausting to atmosphere the air received through the main port and against the valve member.
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 October 1, 1998 and granted March 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 1, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 1, 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.