Combination motor/pneumatic driven train brake pipe pressure exhaust valve
CA 2213013 C · Owner: Hart, James E. · Inventors: Bezos, Angel P.; Hart, James E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A valve device is used to reduce the air pressure in a brake pipe disposed on a railroad car in a train consist at a location in the train consist remote from the locomotive of the train consist. The valve device defines a primary supply passage a, branch supply passage and an exhaust passage. The primary and branch passages communicate with the brake pipe. All of the passages communicate with an elongated bore defined within the valve device. The valve device includes an adjustable first valve, a second valve, an electric motor drive and an pneumatic drive. The adjustable first valve and the second valve are both part of an elongated valve body member that can move reciprocatingly within …
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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 August 13, 1997 and granted May 29, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 13, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 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.