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Expired Canadian patentCanada

Depth sensing skid assembly

CA 1282275 C · Owner: Deere & Company · Inventors: Pearson, Michael Lee

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

Abstract of the Disclosure A depth sensing skid arrangement for an implement including a spring steel depth skid connected to a shank which in turn is pivotally connected to a shank support bracket including a spring trip arrangement which permits backing of the implement without damage to the skid or shank. The shank support bracket in turn is connected to a transverse beam operably connected to valve control structure for operating a hydraulic cylinder to maintain a preselected depth of penetration of earth-working tools mounted on the frame. To provide an averaging effect two, resilient depth skids are transversely spaced on the beam.

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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 April 2, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 2, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 6, 1987
GrantedApril 2, 1991
Term endedApril 2, 2008
Patent numberCA 1282275 C
Classification (IPC)A01B63/11 +1 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedAug 6, 1987Patent grantedApril 2, 1991Term endedApril 2, 2008

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.