Patent ID: 6963054

Claim:
A device for heating air, fluid and materials, destined to cover surfaces and objects flat or otherwise, all sizes and shapes, filled-in or cellular, comprising a non-electrically conducting base surface having first and second electrodes separated from one another by a fixed or variable distance, length L, said first and second electrodes being adapted to be electrically connected to a source of electric current; and a material coated on at least a portion of said base surface over length L, said material having an adjustable specific resistance, such that when said first and second electrodes are connected to said source of electric current, said material acts as a heating element, wherein said material comprises a binding agent containing from 10 to 90% by weight in conductive charge of a mixture of a granular base and a base in strip form to provide electrical specific resistance, said granular base and base in strip form being present in a proportion of from 50/50 to 10/90% according to the required final specific resistance.