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Expired Canadian patentCanada

High-voltage transformer comprising a foil winding

CA 1051985 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Baggermans, Albertus B.A.

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

The low-voltage winding of a line transformer consists of a foil winding. In order to tune the line transformer to the third or the fifth harmonic, the coupling factor is adjusted by sliding the highvoltage winding with respect to the low-voltage winding. The length of the leg of the core whereabout the low-voltage winding and the highvoltage winding are arranged substantially exceeds thewidth of the lowvoltage winding. The high-voltage winding can be partly slid off the low-voltage winding, with the result that the coupling factor is reduced.

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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 April 3, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 3, 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—
GrantedApril 3, 1979
Term endedApril 3, 1996
Patent numberCA 1051985 A
Classification (IPC)H01F21/04 +2 more

Timeline

Timeline From CIPO dates

198019821984198619881990199219941996Patent grantedApril 3, 1979Term endedApril 3, 1996

Sources & verification

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