Railroad crossing traffic warning system apparatus and method thereof
CA 2211547 C · Owner: Eva Signal Corporation · Inventors: Pace, Joseph A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A railroad traffic warning system for alerting a motorist or a maintenance-of-way crew of an approaching train. The system has magnetometer sensor probes (50) along the right-of-way adjacent to a railroad track. These sensor probes (50) provide a signal to a controller unit (32) when the presence of a train is sensed. The system may be powered by a battery which may be recharged by a solar panel array (40).
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 January 13, 1997 and granted March 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 13, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 13, 2019.
- 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.