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ELECTRIC RESISTANCE HEATING CABLE

  • US 3,646,322 A
  • Filed: 01/05/1971
  • Issued: 02/29/1972
  • Est. Priority Date: 02/13/1970
  • Status: Expired due to Term
First Claim
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1. An electric redistance heating cable comprising a flexible core of electrically insulating material, a heating wire wound helically around said core and extending throughout the length of the cable and a covering of electrically insulating material, the cable being divided into at least two groups of alternating sectors extending in the longitudinal direction of the cable, which sectors assume mutually different temperatures during use of the cable, said heating wire comprising sections having a comparatively high resistance per unit of length alternated by sections having a comparatively low resistance per unit of length.

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