Disk harrow hydraulic wing balancing system
CA 1263286 C · Owner: Deere & Company · Inventors: Delfs, Larry Marvin; Burk, Ronnie Franklin; Gilmore, Michael Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A weight-balancing system for a farm implement such as a, disk harrow with foldable wings operated by wingfold cylinders includes a selective control valve for controlling fluid communication to the head and rod ends of the wingfold cylinders. A pair of pressure-reducing/relieving valves permit individual adjustment of the pressures in both the head and rod ends to achieve the desired balance. In a preferred embodiment a pilot-operated, two-position valve is connected between the rod ends and one of the pressure-responsive valves. The twoposition valve is operated by pressure signals generated by a flow-responsive switching valve connected between the twoposition …
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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
- Granted November 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 28, 2006.
- 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.