Method and apparatus for tracking trains through multiple false track circuit occupancies
CA 2017320 C · Owner: Aeg Transportation Systems, Inc. · Inventors: Milnes, Robert D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A central control system for monitoring a plurality of trains throughout a transit system having means for tracking the location of the trains throughout the system and for detecting and recording false train occupancy indications. The system being designed to handle an infinite number of false occupancy designations and always associating each train with a physical track circuit location.
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 May 23, 1990 and granted December 27, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2012.
- 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.