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Expired Canadian patentCanada

Wound type high voltage resistance wire

CA 1333494 C · Owner: Sumitomo Wiring System, Ltd. · Inventors: Koto, Katsumi

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 wound type high voltage resistance wire comprises a covering layer provided on the resistance wire and being formed of a semiconductive material with the thickness of 4 - 8 µm and the value of resistivity being 102 .OMEGA..cm - 105 .OMEGA..cm. The wire having the covering layer is closely wound around a core member such that adjacent coils contact with each other.

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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 December 13, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 13, 2011.
  • 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 27, 1989
GrantedDecember 13, 1994
Term endedDecember 13, 2011
Patent numberCA 1333494 C
Classification (IPC)H01C3/00

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedSep 27, 1989Patent grantedDec 13, 1994Term endedDec 13, 2011

Sources & verification

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