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Expired Canadian patentCanada

Protective circuit for dynamic braking resistors

CA 1068331 A · Owner: Mosebach Manufacturing Company · Inventors: Kirilloff, Victor V.

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 circuit for protecting a pair of dynamic brake resistors when either of two motors driving fans for cooling the resistors fails. A sensing circuit couples the terminal of the two motors to a switch circuit. The sensing circuit reduces the energy to the switch circuit which removes power to the resistors when the sensing circuit senses a failure in one of the motors.

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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 December 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 18, 1996.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedDecember 18, 1979
Term endedDecember 18, 1996
Patent numberCA 1068331 A
Classification (IPC)H02H3/00 +2 more

Timeline

Timeline From CIPO dates

198019821984198619881990199219941996Patent grantedDec 18, 1979Term endedDec 18, 1996

Sources & verification

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