Heating cable
OwnerGlenwood Franklin Heizerinventor
Life of this patent
Estimating the term…
Abstract
A heating cable for maintaining pipes and related equipment at temperatures above freezing or at elevated process temperatures. The heating cable includes a pair of elongated electrode wires each coated with a layer of insulating material. The layer of insulating material is partially stripped off the wires at spaced, alternating locations. A resistive heater wire is helically wound around a yarn of fibrous insulating material to form an elongated resistor core. The elongated resistor core is spirally wound around the electrode wires and is brought into electrical contact with the electrode wires at the alternating locations where the wires are partially stripped. A second layer of insulating material covers the elongated resistor core and forms an outer surface for the cable.
Claims11
A heating cable, including:
- (a) at least a pair of elongated electrode wires, each of said wires being coated with a first layer of insulating material, said first layer of insulating material being at least partially stripped off selected ones of said wires at spaced, alternating locations;
- (b) a resistive heater wire helically wound around a yarn of fibrous insulating material to form an elongated resistor core, said resistor core being spirally wound around said electrode wires whereby said heater wire is brought into electrical contact with said selected ones of said electrode wires at said alternating locations, to electrically connect said alternating locations with said resistive heater wire;
- (c) a layer of fibrous insulating material disposed over said resistive heater wire, said layer of fibrous insulating material one of wound and braided;
- (d) a second layer of an insulating material disposed over said resistive heater wire, said second layer of insulating material forming an outer surface for said cable.
Dependencies are inferred from the claim text.