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Expired Canadian patentCanada

Method and apparatus for rechipping wood chips

CA 1108969 A · Owner: Rader Companies Inc. · Inventors: Smith, William C.

CIPO record

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

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Abstract From the Canadian patent

A wood chip rechipping method and apparatus are provided wherein a slotted, cylindrical drum rotates about a concentrically mounted rotatable anvil rotor having a plurality of arms, each of which has a blade at its out extremity. The drum and anvil rotor arms rotate in the same direction but at different speeds. The rotating apparatus induces centrifugal force on the wood chips to position them against the inner periphery of the drum where the blades on the relatively faster rotating anvil arms shear off a chip slice having a predetermined thickness. This shearing action continues until each chip has been rechipped into slices capable of passing through one of the drum knife slots and into …

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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 September 15, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 15, 1998.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 15, 1980
GrantedSeptember 15, 1981
Term endedSeptember 15, 1998
Patent numberCA 1108969 A
Classification (IPC)B27L11/02 +1 more

Timeline

Timeline From CIPO dates

198119831985198719891991199319951997Application filedFeb 15, 1980Patent grantedSep 15, 1981Term endedSep 15, 1998

Sources & verification

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