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Expired Canadian patentCanada

Control system

CA 1258484 A · Owner: Kabushiki Kaisha Toshiba · Inventors: Kurosawa, Ryoichi

CIPO record

Overview

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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 control system capable of improving a disturbance response characteristic, includes a control processing unit and a power converter. The control processing unit includes a block for providing a signal A equals to a predetermined transfer function GX(s) of a detected value of a controlled variable n a block, for providing a signal B equals to a transfer function (1 + Gx(s).GLH(s)) of a first command value and a block for providing, as a second command value a difference, T* between said A and B signals where GLH(s) is a, simulated transfer function which is from T* to n. The power converter controls the controlled variable according to the second command value.

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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 August 15, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 15, 2006.
  • 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 3, 1986
GrantedAugust 15, 1989
Term endedAugust 15, 2006
Patent numberCA 1258484 A
Classification (IPC)G05B11/36 +2 more

Timeline

Timeline From CIPO dates

1987198919911993199519971999200120032005Application filedFeb 3, 1986Patent grantedAug 15, 1989Term endedAug 15, 2006

Sources & verification

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