Coded railway track circuit having reduced power standby mode capability
CA 2099204 C · Owner: Brown, James P. · Inventors: Brown, James P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coded railway track circuit apparatus is disclosed having the capability of operating during periods of low vehicle activity in a reduced power standby mode. This is accomplished by switching circuitry which interrupts power to most of the components within the track circuit apparatus in response to the recognition by standby initiation circuitry of a preselected standby initiation signal. Power to failover indicators which would normally be activated due to a power failure is also interrupted by fail-over interrupt circuitry. During the standby mode monitor, circuitry remains active to recognize occurrence of a preselected wake-up signal. When the wake-up signal is received, full power …
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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 June 25, 1993 and granted January 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2015.
- 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.