Howard S Shapiro

US Patent:

41683447, Sep 18, 1979

Filed:

Sep 26, 1977

Appl. No.:

5/836574

Inventors:

Howard E. Shapiro - Philadelphia PA
Kenneth M. Merz - Gladwyne PA

Assignee:

TRW Inc. - Cleveland OH

International Classification:

H01B 102

US Classification:

428427

Abstract:

A material for a vitreous enamel electrical resistor includes a mixture of a glass frit and particles of nickel, iron and cobalt. The material is applied to a substrate and fired to melt the glass frit, and then cooled to form a layer of the glass with particles of an alloy of nickel, iron and cobalt embedded therein. The material provides a resistor having a high temperature coefficient of resistance and which can be self terminating.

US Patent:

42052980, May 27, 1980

Filed:

Nov 20, 1978

Appl. No.:

5/962233

Inventors:

Howard E. Shapiro - Philadelphia PA
Kenneth M. Merz - Gladwyne PA

Assignee:

TRW Inc. - Cleveland OH

International Classification:

H01C 1012

US Classification:

338308

Abstract:

A vitreous enamel resistor material comprising a mixture of a vitreous glass frit and fine particles of tantalum nitride (Ta. sub. 2 N). The vitreous enamel resistor material may also include fine particles selected from boron, tantalum, silicon, zirconium dioxide (ZrO. sub. 2), and magnesium zirconate (MgZrO. sub. 3). An electrical resistor is made from the resistor material by applying the material to a substrate and firing the coated substrate to a temperature at which the glass melts. Upon cooling, the substrate has on a surface thereof a film of glass having the tantalum nitride particles and particles of the additive material, if used, embedded therein and dispersed therethroughout.