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Controllable thermal warming devices

  • US 9,877,526 B2
  • Filed: 12/27/2011
  • Issued: 01/30/2018
  • Est. Priority Date: 04/19/2001
  • Status: Active Grant
First Claim
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1. A portable heating system comprising a controllable thermal warming device, the controllable warming device comprising;

  • a thermal heating element comprised of conductive inks printed in the form of a series of interconnected lines having a definite or definitive pattern and fixedly disposed on a single sheet of nonconductive substrate;

    a power source operatively coupled to the conductive ink pattern, the power source adapted to deliver a voltage to the conductive ink to cause the conductive ink pattern to radiate heat;

    a controller operatively coupled to the power source and the conductive ink, the controller adapted to control the voltage to the conductive ink pattern whereby the heating element, the power source and the controller comprise a portable unit.

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