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Air warmer

  • US 8,143,554 B2
  • Filed: 03/14/2008
  • Issued: 03/27/2012
  • Est. Priority Date: 03/16/2007
  • Status: Expired due to Fees
First Claim
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1. A heating element comprising:

  • a chamber having and an inlet and an outlet and defining a flow direction that extends from the inlet to the outlet;

    a resistive material positioned on at least one substrate, wherein a combination of the resistive material and the at least one substrate are folded into a plurality of folds that extend substantially parallel to the flow direction;

    the resistive material disposed on the substrate, wherein adjacent folds of the combination of the resistive material and the substrate define a plurality of gaps through which at least a portion of air entering the inlet passes; and

    at least one electrical lead operatively coupled to the resistive material such that an electrical current can be delivered through the resistive material;

    wherein the resistive material is configured to produce heat when electrically energized; and

    wherein heat transfer is configured to occur between heat generated along the folded substrate and air passing through the plurality of gaps.

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