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Expired Canadian patentCanada

Circuit breaker test kit

CA 1283446 C · Owner: Purkayastha, Indrajit · Inventors: Purkayastha, Indrajit; Burton, Thomas Douglas

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 test kit for a digital and analog, electronic circuit breaker determines the calibration and overcurrent response of the circuit breaker when connected within an electric power circuit. The test kit simulates an overcurrent condition and provides verification of the circuit breaker response without de-energizing the circuit breaker or interfering with the circuit breaker's protection functions. The test kit connects with the digital communications circuit within the digital circuit breaker to obtain status information concerning pick-up conditions trip, conditions and fault currents which are viewed on the test kit liquid crystal display. A ground fault suppression circuit is included …

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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 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 23, 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.
FiledMay 19, 1988
GrantedApril 23, 1991
Term endedApril 23, 2008
Patent numberCA 1283446 C
Classification (IPC)G01R31/02 +2 more

Timeline

Timeline From CIPO dates

1989199119931995199719992001200320052007Application filedMay 19, 1988Patent grantedApril 23, 1991Term endedApril 23, 2008

Sources & verification

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