Method and apparatus for controlling trains by determining a direction taken by a train through a railroad switch
CA 2273400 C · Owner: Montgomery, Stephen R. · Inventors: Halvorson, David H.; Hungate, Joe B.; Montgomery, Stephen R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for determining the presence of a third rail disposed between parallel railroad tracks as a train progresses along said parallel railroad, tracks and further for determining the relative direction of motion of said third rail, with respect to said first two rails and further for determining the rate at which the, third rail moves with respect to the first rails is disclosed which is a low , power, radar sensor disposed underneath the rail vehicle and directed toward the rail on, the opposing side of the vehicle. In a preferred embodiment two rail , detectors, are shown which are disposed on opposite sides of the rail vehicle. The radar detectors are coupled with an onboard …
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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 May 31, 1999 and granted April 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2021.
- 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.