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Expired Canadian patentCanada

Method and circuit for evaluating an analog voltage

CA 1237476 A · Owner: Ncr Corporation · Inventors: Pipkorn, Mark G.

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

Abstract of the Disclosure, A method and circuit for detecting a fault condition in a voltage distribution bus which includes sensing a first voltage drop across a test resistor wired in series with the bus, sensing a second voltage drop across a second resistor wired in series with the bus and comparing the first and second voltage drops to detect a fault condition in the voltage supply connected to the bus.

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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 May 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2005.
  • 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 17, 1986
GrantedMay 31, 1988
Term endedMay 31, 2005
Patent numberCA 1237476 A
Classification (IPC)G01R19/15 +1 more

Timeline

Timeline From CIPO dates

1987198919911993199519971999200120032005Application filedFeb 17, 1986Patent grantedMay 31, 1988Term endedMay 31, 2005

Sources & verification

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