Jackknife prevention device
CA 2024099 C · Owner: Rainville, Edmond · Inventors: Rainville, Edmond
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a coupling mechanism for a tractor trailer combination a Jackknife , prevention device consisting of; a main plate which is free to rotate about the king pin and held in position by a snap ring and a washer, a, coupling wedge which transmits the torque exerted by the fifth wheel to the main plate and is attached, firmly to the underside of the mainplate a mainplate which acts as a sheave , wheel cables which operate a, hydraulic cylinder a set of grooved pulleys reducing the amount of travel required by the hydraulic, cylinder, two fluid velocity sensing lock-up valves and a shut off valve which allows the hydraulic fluid to, by-pass the two fluid velocity sensing loch-up valves.
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 June 4, 1990 and granted November 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 4, 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.