Control system for field markers of an agricultural machine
CA 2201245 C · Owner: Sjoberg, Rodney E. · Inventors: Scott, William A.; Sjoberg, Rodney E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control apparatus for use with two opposed ground markers of an agricultural machine comprises a hydraulic circuit including a plurality of hydraulic, valves for communicating fluid to first and second cylinders to actuate said movements of the first and second markers and an electrical control system including a plurality of manually operable actuating switches the electrical , control, system being arranged to effect operation of said hydraulic valves in response to, operation of said manually operable switches. Each of the switches is of the type, providing an output in response to a singled actuation thereof and there is provided an output timer operable to effect operation of said …
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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
- Filed March 27, 1997 and granted May 23, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2019.
- 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.