Self-regulating heating element
AssigneeU.S. Philips Corporation
InventorsAndre Marcel Alfred Van Bokestal, Charles Joseph Ghislain Belhomme
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Abstract
Self-regulating heating element comprising one or more PTC resistors enveloped by a synthetic-material/filler mixture which has a good heat conductivity such as an MgO-SiO.sub.2 -silicon rubber mixture.
Claims8
In a self-regulating heating device containing at least one resistor body provided with current conductors and consisting of a ceramic body having a positive temperature coefficient electrical resistance, a casing enclosing said resistor body and spaced from said resistor body by heat conducting electrically insulating material surrounding said resistor body and located between said resistor body and said casing, the improvement wherein both the casing and the material located between the casing and the resistor body consist essentially of a vulcanized synthetic resin material capable of resisting the highest operating temperature of said device, an electrically insulating, heat conducting metal compound and a finely divided reinforcing filler material.
Dependencies are inferred from the claim text.