Vehicle activated wheel chock positioning device
CA 2184815 C · Owner: Ellis, Elwood · Inventors: Ellis, Elwood
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for loading and unloading a vehicle including: a vehicle actuated wheel chock positioning device (10) for at least one tire (T2) of such a vehicle which is rotatable on a treadway (S) between an initial position (A) and a plurality of operating positions (A B) the, chock positioning device (10) including a mechanism (15) engageable by such tire (T2) at the initial position (A) and movable with the tire (T2) as it rolls on the treadway (S) a chock (16) positionable behind the tire (T2) when the mechanism (15) is in any of the operating positions (A, B) in response to engagement of the mechanism (15) by the rolling tire (T2) and a lock (30) capable of selectively locking the chock …
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 February 21, 1995 and granted February 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 21, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 21, 2017.
- 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.