초록

An heating unit made of a sheet of non-woven fibrous material having carbon particles embedded therein in a concentration to provide passage of low level electricity. A pair of electrodes disposed opposite each other and a wire connecting each electrode to a source of electricity.

대표청구항 ▼

An electrical heating unit comprising a base sheet of fibrous material having metallic particles embedded therein in an arrangement throughout substantially the entire area of said sheet and in a concentration sufficient to permit a low level of electric current to pass through said sheet, and an el

An electrical heating unit comprising a base sheet of fibrous material having metallic particles embedded therein in an arrangement throughout substantially the entire area of said sheet and in a concentration sufficient to permit a low level of electric current to pass through said sheet, and an electrode disposed near each of a pair of opposed edges of said sheet, connectable to a source of electric current, each of said electrodes comprising a narrow foil of highly conductive metal attached to the surface of said sheet and secured to each other and to said base sheet by a stitched thread passing therethrough, said base sheet and foils being sandwiched between a pair of resilient flexible insulating covers extending beyond the peripheral edges of said base sheet and being adhesively secured together to seal said heating unit therein.