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Expired Canadian patentCanada

Power transmission system with current limiting device

CA 1261388 A · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Suzuki, Hiroshi; Shinozaki, Yasuhide; Yokouchi, Kazuhiro

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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 power transmission system having a plurality of power transmission stations for transmitting power from a power-receiving line to respective branch circuits wherein each power transmission station includes a protection circuit providing a current path for transmitting power to or receiving power from other stations. Each protection circuit has a series circuit of a current limiting breaker and a current detector and a bypass switch in parallel with the series circuit. When operation of one station is selectively interrupted to allow inspection for example, of, the main transformer, the bypass switch of the one station is closed to provide a current path for the associated branch circults …

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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 September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 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.
FiledDecember 14, 1984
GrantedSeptember 26, 1989
Term endedSeptember 26, 2006
Patent numberCA 1261388 A
Classification (IPC)H02H7/22 +1 more

Timeline

Timeline From CIPO dates

19851988199119941997200020032006Application filedDec 14, 1984Patent grantedSep 26, 1989Term endedSep 26, 2006

Sources & verification

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