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Flexible spirally shaped heating element

  • US 6,539,171 B2
  • Filed: 01/08/2001
  • Issued: 03/25/2003
  • Est. Priority Date: 01/08/2001
  • Status: Expired due to Fees
First Claim
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1. A method of manufacturing a heating element comprising:

  • winding a first resistance heating material in a continuous spiral path having a plurality of spiral forms disposed in three dimensions along a longitudinal axis, and connected by “

    u”

    shaped bends, coating a portion of said resistance heating material with an electrically insulating, polymeric material, whereby said resulting heating element has a first radius of curvature at ambient temperature, and a second radius of curvature at 160°

    F., as measured on the surface of the polymer material, which is substantially greater than said first radius of curvature.

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