Independent continual quick service valve device
CA 2005295 C · Owner: American Standard Inc. · Inventors: Gaughan, Edward W.; Hart, James E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Case No. 8351), ABSTRACT OF THE DISCLOSURE A continual type quick service valve adapted to be independently mounted on a railway car to provide local supplemental venting of the car brake pipe pressure as, long as the brake pipe pressure continues to be reduced externally. This quick service venting of the brake pipe pressure is achieved utilizing a single piston actuated exhaust valve that is either, cyclically-operated between open and closed states or is held open continuously depending upon the degree of brake application in effect. By selective tuning the, open duration of the exhaust valve can be made to exceed the duration the exhaust valve is closed during each cycle of operation or …
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 December 12, 1989 and granted November 8, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2011.
- 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.