Weight transfer system for an agricultural machine
CA 2116791 C · Owner: Deere & Company · Inventors: Foley, Daniel Michael; Snyder, Michael Duane
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pair of grain drills are positional for side by side operation in the field and connected to a towing tractor by weight transfer hitch having a rear end portion connected to the grain drills and a forward tongue portion having its front end connectable to the tractor drawbar and its rearward end totally connected to the forward end of the rear hitch portion for swinging about a transverse horizontal pivot. A hydraulic cylinder has its ends respectively connected to the tongue and the rear hitch portion and pressure to the cylinder is controlled by an adjustable pressure control valve that delivers pressurized fluid from the tractor hydraulic system to the cylinder at a pre-selected …
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 March 2, 1994 and granted November 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 2, 2016.
- 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.