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Expired Canadian patentCanada

Inertia type fluid mount using electrorheological and other fluid

CA 1282802 C · Owner: Hodgson, Douglas A. · Inventors: Duclos, Theodore G.; Carlson, J. David; Hodgson, Douglas A.

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

The mount includes first and second chambers containing water, glycol or similar conventional hydraulic fluid of low viscosity, and at least a third chamber containing electrorheological fluid that is used to "tune" the frequencies at which the mount experiences abrupt reduction of dynamic stiffness. The third chamber is contiguous with one of the first and second chambers, and with one end of an inertia track passageway whose opposite end is contiguous with the other of the first and second chambers. Energization of an electrode-type of valve associated with the third chamber produces a high voltage electrical field and fluid solidification within the third chamber. Pressure pulses are …

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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 9, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 9, 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 31, 1987
GrantedApril 9, 1991
Term endedApril 9, 2008
Patent numberCA 1282802 C
Classification (IPC)F16F13/00 +2 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedAug 31, 1987Patent grantedApril 9, 1991Term endedApril 9, 2008

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