Charging cut-off valve arrangement for microprocessor-based electropneumatic locomotive brake control system
CA 2105151 C · Owner: Westinghouse Air Brake Company · Inventors: Cunkelman, Brian L.; Balukin, Richard F.; Neilson, George B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A microprocessor-based locomotive brake control system having an electropneumatic brake pipe pressure regulating circuit via which a train brake pipe pressure is controlled and a normally closed charging cut-off valve between the brake pipe regulating circuit and the brake pipe. The charging cut-off valve is electropneumatically controlled in order to effect opening of the normally closed charging cut-off valve on a controlling locomotive. An arrangement is provided for maintaining the charging cut-off valve open when electric power is lost on a controlling locomotive while, providing for closure of the charging cut-off valve on a non-controlling locomotive irrespective of the presence or …
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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 30, 1993 and granted August 4, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 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
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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.