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Expired Canadian patentCanada

Composite sheet winding for an electromagnetic induction apparatus

CA 1077147 A · Owner: Canadian General Electric Company Limited · Inventors: Katchanoski, Kenneth J.

CIPO record

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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 composite sheet winding for an electromagnetic induction apparatus (such as a transformer) comprises two or more sheet winding portions, spaced apart axially and wound, on a common insulated core. The turns of each winding portion as well as the winding portions themselves are insulated from, one another by common insulation which extends uninterrupted for the complete axial length of the composite winding. Electrically insulated conductors located at the radial peripheries of the composite winding connect the start and the finish of each winding portion to the end of the composite winding. Preferably all the insulated conductors exit the composite winding at one common end, and …

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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 May 6, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 6, 1997.
  • 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—
GrantedMay 6, 1980
Term endedMay 6, 1997
Patent numberCA 1077147 A
Classification (IPC)H01F27/28 +2 more

Timeline

Timeline From CIPO dates

198119831985198719891991199319951997Patent grantedMay 6, 1980Term endedMay 6, 1997

Sources & verification

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