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Expired Canadian patentCanada

Vibratory spiral elevator

CA 1293949 C · Owner: General Kinematics Corporation · Inventors: Musschoot, Albert

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

A spiral elevator is described for conveying product from one level to another level up a spiral track. The elevator is powered by a two-mass system having an exciter resiliently supported on the vertical tube. The exciter has a pair of parallel shafts with a vibration generating member mounted on each shaft. A motor is provided for driving each shaft independent of the other shaft. Controls are provided for controlling the vibratory forces generated by the vibration generating members to vary the vibratory forces from substantially zero unbalance to a desired level of unbalance to convey product from the inlet to the outlet of the spiral track.

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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 January 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 7, 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.
FiledJanuary 26, 1988
GrantedJanuary 7, 1992
Term endedJanuary 7, 2009
Patent numberCA 1293949 C
Classification (IPC)B65G33/00 +2 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedJan 26, 1988Patent grantedJan 7, 1992Term endedJan 7, 2009

Sources & verification

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