Please download the dossier by clicking on the dossier button x
×

Electrical heating element for use in a personal comfort device

  • US 4,910,391 A
  • Filed: 08/29/1988
  • Issued: 03/20/1990
  • Est. Priority Date: 08/29/1988
  • Status: Expired due to Fees
First Claim
Patent Images

1. An electrical heating element protected against being inimical to the health of a person using the element, comprising:

  • (a) an electrical heating means for generating heat in proportion to an amount of electrical current flowing therethrough, said heating means providing essentially all of the heat for said element and including a non-conductive core and a conductive resistance portion helically wrapped around said core and a positive temperature conductive polymer surrounding said conductive resistance portions and electrically contacting said conductive resistance portion; and

    ,(b) means disposed over said electrical heating means for enclosing the electromagnetic and electrostatic fields of the electrical current flowing therethrough including an electrically conductive foil portion wrapped over said conductive polymer and electrically contacting said conductive polymer, said electrically conductive foil portion surrounding and enclosing said conductive polymer for enclosing the electromagnetic and electrostatic fields of the electrical current flowing through said conductive resistance portion.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×