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Expired Canadian patentCanada

Static inverter and a transformer for use in a static inverter

CA 1138542 A · Owner: General Electric Company · Inventors: Schmitz, Nicholas A.; Harris, James E.; Peil, William

CIPO record

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Abstract From the Canadian patent

A static inverter and a transformer for use in a static inverter are disclosed. The inverter comprises one or two switching semiconductor devices and a novel power transformer having a primary winding and first and second control windings associated with a linear magnetic core. A pair of serially arranged apertures partition the core into five localized branches. The second control winding is coupled via a central branch lying between the apertures, to the first control winding. At the initial part of each switching cycle, regenerative control action is provided to the associated switching device by the first control winding. As the cycle progresses, a pair of branches saturate reducing the …

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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 28, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 28, 1999.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 2, 1979
GrantedDecember 28, 1982
Term endedDecember 28, 1999
Patent numberCA 1138542 A
Classification (IPC)H01F38/00 +2 more

Timeline

Timeline From CIPO dates

1980198219841986198819901992199419961998Application filedMarch 2, 1979Patent grantedDec 28, 1982Term endedDec 28, 1999

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