Pneumatically operated graduated release valve for rail vehicles
CA 1265563 C · Owner: Knorr Brake Holding Corporation · Inventors: Engle, Thomas; Vaughn, Lawrence; Newton, Ronald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Passenger rail vehicle brake control valve apparatus includes, a control valve device of the type limited to direct release of the brakes, having service, emergency and continu-, ous quick service portions secured to a pipe bracket and a, graduated release valve portion governed jointly by brake cylinder pressure, brake cylinder exhaust passage pressure from the control valve device, and brake pipe pressure to at times modify output of the control valve device to provide for graduated control of the passenger rail vehicle brakes.
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
- Granted February 6, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 6, 2007.
- 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.