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Expired Canadian patentCanada

Magnetic material having high permeability in the high frequency range

CA 1263435 C · Owner: Ochiai, Yoshitaka · Inventors: Hayashi, Kazuhiko; Aso, Koichi; Ochiai, Yoshitaka

CIPO record

Overview

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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 magnetic structure having improved permeability characteristics at very high frequencies and comprising a plurality of magnetic metal layers, together with electrically insulating layers which are interposed between successive magnetic metal layers to form a laminate therewith and at least, one conductive strip electrically connecting together at least two of the magnetic metal layers, the conductive strip being of lesser width than the surface on which it is located and serving, to reduce eddy current losses.

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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 November 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 28, 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.
FiledSeptember 5, 1985
GrantedNovember 28, 1989
Term endedNovember 28, 2006
Patent numberCA 1263435 C
Classification (IPC)G11B5/12 +1 more

Timeline

Timeline From CIPO dates

1986198919921995199820012004Application filedSep 5, 1985Patent grantedNov 28, 1989Term endedNov 28, 2006

Sources & verification

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