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Expired Canadian patentCanada

Motor torque control with improved linearity

CA 1201162 A · Owner: Wilkerson, Alan W. · Inventors: Wilkerson, Alan W.

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Abstract From the Canadian patent

Motor Torque Control with Improved Linearity Abstract of the Disclosure, A direct current motor control circuitry provides linearity between an input signal to the circuitry and torque developed in the motor energized by the circuitry. A signal divider algebraically divides a numerator signal by a denominator signal and provides a quotient signal as the output. The input signal is provided to the signal divider as the numerator signal. A field circuit energizes the field winding of the motor. An armature circuit energizes the armature winding. One of the field or armature circuit provides a signal proportional to the respective one of field current or armature current to the denominator …

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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 February 25, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 25, 2003.
  • 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, 1983
GrantedFebruary 25, 1986
Term endedFebruary 25, 2003
Patent numberCA 1201162 A
Classification (IPC)H02P7/06 +1 more

Timeline

Timeline From CIPO dates

1984198619881990199219941996199820002002Application filedAug 31, 1983Patent grantedFeb 25, 1986Term endedFeb 25, 2003

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