초록 ▼

A self-regulating heating article comprising a layer of material exhibiting a positive temperature coefficient of resistance (PTC) and said PTC layer having at least partially contiguous therewith at least one layer of constant wattage output material. The article operates such that when connected t

A self-regulating heating article comprising a layer of material exhibiting a positive temperature coefficient of resistance (PTC) and said PTC layer having at least partially contiguous therewith at least one layer of constant wattage output material. The article operates such that when connected to an electric power source, the current flows through at least a portion of the thickness of the PTC layer and of the constant wattage layer.

대표청구항 ▼

A self-regulating electrical device which comprises (a) at least one PTC layer composed of a PTC material which exhibits PTC behavior with an anomaly temperature Ts; (b) at least one CW layer which exhibits CW behavior at Ts and below, at least a part of a surface of the CW layer being in direct ele

A self-regulating electrical device which comprises (a) at least one PTC layer composed of a PTC material which exhibits PTC behavior with an anomaly temperature Ts; (b) at least one CW layer which exhibits CW behavior at Ts and below, at least a part of a surface of the CW layer being in direct electrical and physical contact with at least a part of a surface of the PTC layer; and (c) at least two electrodes which, when connected to a source of electrical power, cause electrical current to flow through the device; wherein (1) each of said PTC and CW layers is a layer through which pass all conductive paths between the electrodes; (2) the preferred current path between the electrodes is unchanged as the passage of current through the device converts it from a low resistance state to a high resistance state; and (3) when the device is at room temperature, the ratio RCW/RPTC is at least 0.7, where RCW is the total resistance of the CW layer or layers and RPTC is the total resistance of the PTC layer or layers.