Wheel spin speed processing system for multiple-axle railway vehicles
CA 2129402 C · Owner: Wood, James A. · Inventors: Wood, James A.; Drake, John W.; Jamieson, Paul E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vehicle-in-spin speed processing system for multiple wheel axle units of a self-powered railway vehicle in which a reasonably accurate vehicle speed reference signal is produced as the wheel axle units are experiencing wheel spin during acceleration of the selfpowered railway vehicle so that a minimum amount of error occurs in the output data of speedometers odometers, and, event recorders.
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 August 3, 1994 and granted February 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 3, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 2016.
- 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.