초록 ▼

An electrical resistance heating element protected against being inimical to the health of a person using the element by enclosing the electromagnetic and electrostatic fields of an electrical current flowing through an electrical heating element providing essentially all of the heat for the element

An electrical resistance heating element protected against being inimical to the health of a person using the element by enclosing the electromagnetic and electrostatic fields of an electrical current flowing through an electrical heating element providing essentially all of the heat for the element.

대표청구항 ▼

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

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.