Duplex resistor inks
AssigneeUniversal Oil Products Company
InventorKarl J. Youtsey
Life of this patent
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Abstract
Electrical resistor inks comprising a mixture of carbon black and a semi-conducting pyropolymeric inorganic material along with a vehicle consisting of a binder such as a synthetic resin or a varnish and a suitable solvent or oil, etc. are useful in forming resistors in electrical circuits, the resistor ink possessing a temperature coefficient of resistance of less than 500 ppm/.degree. C.
Claims11
An electrical resistor ink possessing a temperature coefficient of resistance of from about +500 ppm/.degree.C to about -500 ppm/.degree.C comprising a resistive component and a vehicle containing a binder of synthetic or natural resin and a solvent, oil or mixtures thereof, said resistive component comprising from about 10% to about 97% of a mixture of carbon black and an alumina or silica-alumina base having a mono-layer of a carbonaceous pyropolymer on the surface thereof, the weight percent of semiconducting pyropolymeric inorganic refractory oxide material in said resistive component being in the range of from about 25% to about 75%, and said vehicle of said resistor ink upon drying providing electrical continuity between the resistive components.
Dependencies are inferred from the claim text.