Automatic wheel chock system
CA 2297384 C · Owner: United Dominion Industries · Inventors: Alexander, James C.; Hersey, Robert C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A chocking device for securing a vehicle at a loading dock having a guide rail mountable to a driveway and a carriage movable on the guide rail. A drive mechanism which, may be hydraulic or electric is employed to advance said carriage from a stored position to a position proximate to a wheel of said vehicle. A chock assembly is pivotedly mounted on said carriage and is movable by the drive mechanism from a retracted position to an engaging position. In one embodiment the chock assembly comprises an arm having a sensor bar to contact one portion the wheel and a chock plate movable in response to contact of the sensor against the wheel to contact another portion of said wheel and block …
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 October 17, 1996 and granted February 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 2018.
- 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.