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Expired Canadian patentCanada

Three-point suspension for pavers

CA 1302439 C · Owner: Musil, Joseph E. · Inventors: Fairchild, Louis F.; Musil, Joseph E.

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

An improved "3-point" suspension for a paver disposes two of the suspension "points" at the front of the tractor unit and the third "point" at the rear. Preferably the third suspension "point" is achieved by suspending the rear of the tractor unit via laterally spaced hydraulic cylinders interconnected such that upward or downward movement of one rear wheel or track results in corresponding downward or upward movement of the other rear wheel or track. The hydraulic suspension also allows the height of the rear of the tractor unit and thus the height of, the spreader screws relative to the ground to be adjusted on the, run by conjoint upward or downward movement of both rear wheels or tracks.

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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 June 2, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 2, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 29, 1988
GrantedJune 2, 1992
Term endedJune 2, 2009
Patent numberCA 1302439 C
Classification (IPC)E01C19/22

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedSep 29, 1988Patent grantedJune 2, 1992Term endedJune 2, 2009

Sources & verification

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