Railroad crossing gate mechanism control system
CA 2243811 C · Owner: Moe, James E. · Inventors: Levoir, Donald L.; Moe, James E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A railroad crossing gate electrical control system for moving a crossing gate in up and down directions and providing snubbing protection to gate movement in failure modes includes an electrical motor having two diametrically positioned permanent magnet poles and two series connected electromagnet poles. There is an armature which rotates inside of the poles. There is a motor and snub relay which has contacts connected to the armature and the series connected electromagnet poles. A terminal board has movable contacts which are connected to the motor and snub relay and to a relay coil for moving the contacts of the motor and snub relay. A source of power is connected to the terminal board …
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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 July 23, 1998 and granted September 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2020.
- 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.