Row cleaner suspension
CA 2298025 C · Owner: Juptner, Detlef · Inventors: Stephens, Lyle Eugene; Juptner, Detlef; Wendling, Ignatz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A row cleaner device for a furrow forming row unit includes a support arrangement with a parallel linkage having a single acting hydraulic cylinder connected between upper and lower links. The cylinder extension is controlled by a hydraulic circuit to provide adjustable down pressure to maintain consistent operation of the cleaner devices in varying ground conditions. A tensioning device such as a spring extending generally parallel to the cylinder acts to retract the cylinder. A blocking valve can be closed to maintain the cleaner device in the raised position and can lock the cylinder in any desired extended position. An energy storage device such as a spring compressed between the …
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 1, 2000 and granted January 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 1, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 1, 2022.
- 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.