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Expired Canadian patentCanada

Transformer tap changer

CA 1280474 C · Owner: Honeywell Bull Inc. · Inventors: Genuit, Luther Levi

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

One of a plurality of taps of at least one transformer is selected by choosing a predetermined plug to mate with a predetermined jack. The connection arrangement between each transformer and a corresponding jack is such that each pin of a respective jack is operatively connected to a predetermined transformer tap of the corresponding transformer whereby the corresponding taps of each of the transformers are connected to different corresponding pins for each of the corresponding jacks. Further, the starting tap of each transformer is operatively connected to the same corresponding pin of the jack corresponding to the transformer. A plurality of plugs, the number of plugs corresponding to one …

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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 February 19, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 19, 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.
FiledJune 5, 1987
GrantedFebruary 19, 1991
Term endedFebruary 19, 2008
Patent numberCA 1280474 C
Classification (IPC)H01F29/02 +1 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedJune 5, 1987Patent grantedFeb 19, 1991Term endedFeb 19, 2008

Sources & verification

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