US4087778A
Expired / Lapsed
US
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Termination for electrical resistor and method of making the same
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1976-04-05
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Granted: 1978-05-02
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Expires: 1996-04-05
Abstract
Abstract A termination material for a vitreous enamel electrical resistor includes a mixture of a glass frit and particles of either molybdenum, tungsten, tantalum or titanium. The termination material is applied to a substrate and fired to melt the glass frit, and then cooled to form a layer of the glass with the metal particles embedded therein. The termination material may be applied to the substrate either before or after the resistance material is applied to the substrate and is particularly useful with vitreous enamel resistance materials which include either a mixture of tantalum nitride and tantalum, a mixture of tungsten carbide and tungsten, or an alloy of copper and nickel.
Inventors
- 👤 Kenneth M. Merz
- 👤 Howard E. Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:31
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/28; H01C17/281; H01C17/283; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49101
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
36 words
An electrical termination material comprising a mixture of a glass frit and a conductive phase, said conductive phase consisting essentially of particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium.
Claim 2
Dependent Claim
36 words
An electrical termination material comprising a mixture of a glass frit and a conductive phase, said conductive phase consisting essentially of particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium.
Claim 3
Dependent Claim
56 words
An electrical device including a substrate of an electrical insulating material and a termination area on a surface of said substrate, said termination area comprising a layer of glass having embedded therein a conductive phase, said conductive phase consisting essentially of particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium.
Claim 4
Dependent Claim
56 words
An electrical device including a substrate of an electrical insulating material and a termination area on a surface of said substrate, said termination area comprising a layer of glass having embedded therein a conductive phase, said conductive phase consisting essentially of particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium.
Claim 5
Dependent Claim
77 words
An electrical resistor comprising a substrate of an electrical insulating material, a pair of spaced termination areas on a surface of said substrate, each of said termination areas comprising a layer of glass having embedded therein a conductive phase, said conductive phase consisting essentially of particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, and a resistance material layer on said surface of the substrate between and contacting said termination areas.
Claim 6
Dependent Claim
77 words
An electrical resistor comprising a substrate of an electrical insulating material, a pair of spaced termination areas on a surface of said substrate, each of said termination areas comprising a layer of glass having embedded therein a conductive phase, said conductive phase consisting essentially of particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, and a resistance material layer on said surface of the substrate between and contacting said termination areas.
Claim 7
Dependent Claim
27 words
An electrical resistor in accordance with claim 3 in which the resistance material layer comprises a layer of glass having embedded therein particles of a conductive material.
Claim 8
Dependent Claim
46 words
An electrical resistor in accordance with claim 4 in which the conductive particles in the resistance material layer are selected from the group consisting of a mixture of tantalum nitride and tantalum, a mixture of tungsten carbide and tungsten, and an alloy of copper and nickel.
Claim 9
Dependent Claim
25 words
An electrical resistor in accordance with claim 3 in which the resistance material layer overlies at least a portion of each of the termination areas.
Claim 10
Dependent Claim
35 words
An electrical resistor in accordance with claim 6 in which a portion of the termination areas not covered by the resistance material layer is coated with a conductive metal which is easily wetted by solder.
Claim 11
Dependent Claim
23 words
An electrical resistor in accordance with claim 3 in which each of the termination areas overlies a portion of the resistance material layer.
Claim 12
Dependent Claim
30 words
An electrical resistor in accordance with claim 8 in which each of the termination areas is at least partially coated with a conductive metal which is easily wetted by solder.
Claim 13
Independent Claim
105 words
A method of making an electrical device wherein a vitreous enamel termination composition is applied to a substrate comprising the steps of preparing a vitreous enamel termination composition comprising a glass frit and a conductive phase, said conductive phase consisting essentially of finely divided conductive particles selected from the group consisting of molybdenum, tungsten, tantalum and titanium, applying a layer of the composition to an insulating substrate, firing the coated substrate in a non oxidizing atmosphere at a temperature sufficient to form an adherent vitreous composite, and cooling the coated substrate to form a termination thereon having a glass matrix with conductive particles dispersed therein.
Claim 14
Independent Claim
105 words
A method of making an electrical device wherein a vitreous enamel termination composition is applied to a substrate comprising the steps of preparing a vitreous enamel termination composition comprising a glass frit and a conductive phase, said conductive phase consisting essentially of finely divided conductive particles selected from the group consisting of molybdenum, tungsten, tantalum and titanium, applying a layer of the composition to an insulating substrate, firing the coated substrate in a non oxidizing atmosphere at a temperature sufficient to form an adherent vitreous composite, and cooling the coated substrate to form a termination thereon having a glass matrix with conductive particles dispersed therein.
Claim 15
Dependent Claim
23 words
The method of claim 10 in which the terminal composition is fired in nitrogen at a temperature between about 1100° and 1200° C.
Claim 16
Dependent Claim
40 words
The method of claim 10 which includes the step of forming on the substrate a vitreous enamel resistor comprising a layer of glass having particles of a conductive material dispersed throughout the glass layer, which is contacted by the termination.
Claim 17
Dependent Claim
41 words
The method of claim 12 in which the conductive particles of the resistor are selected from the group consisting of a mixture of tantalum nitride and tantalum, a mixture of tungsten carbide and tungsten, and an alloy of copper and nickel.
Claim 18
Dependent Claim
28 words
The method of claim 12 in which the vitreous enamel resistor is formed on the substrate after the application and firing of the termination layer on the substrate.
Claim 19
Dependent Claim
40 words
The method of claim 12 in which the vitreous enamel resistor is formed by applying and firing a resistive layer on the substrate before the application and firing of the termination layer on the substrate in contact with the resistor.
Claim 20
Dependent Claim
44 words
An electrical termination material comprising a mixture of a glass frit and particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, and in which the metal particles are present in the amount of 45% to 85% by volume.
Claim 21
Dependent Claim
44 words
An electrical termination material comprising a mixture of a glass frit and particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, and in which the metal particles are present in the amount of 45% to 85% by volume.
Claim 22
Dependent Claim
25 words
An electrical termination material in accordance with claim 16 in which the metal particles are present in the amount of 45% to 65% by volume.
Claim 23
Dependent Claim
68 words
An electrical device including a substrate of an electrical insulating material and a termination area on a surface of said substrate, said termination area comprising a layer of glass having embedded therein particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, and in which the metal particles are present in the termination area in the amount of 45% to 85% by volume.
Claim 24
Dependent Claim
68 words
An electrical device including a substrate of an electrical insulating material and a termination area on a surface of said substrate, said termination area comprising a layer of glass having embedded therein particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, and in which the metal particles are present in the termination area in the amount of 45% to 85% by volume.
Claim 25
Dependent Claim
28 words
An electrical device in accordance with claim 18 in which the metal particles are present in the termination area in the amount of 45% to 65% by volume.
Claim 26
Dependent Claim
86 words
An electrical resistor comprising a substrate of an electrical insulating material, a pair of spaced termination areas on a surface of said substrate, each of said termination areas comprising a layer of glass having embedded therein particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, the metal particles being present in the termination areas in the amount of 45% to 85% by volume, and a resistance material layer on said surface of the substrate between and contacting said termination areas.
Claim 27
Dependent Claim
86 words
An electrical resistor comprising a substrate of an electrical insulating material, a pair of spaced termination areas on a surface of said substrate, each of said termination areas comprising a layer of glass having embedded therein particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, the metal particles being present in the termination areas in the amount of 45% to 85% by volume, and a resistance material layer on said surface of the substrate between and contacting said termination areas.
Claim 28
Dependent Claim
28 words
An electrical resistor in accordance with claim 20 in which the metal particles are present in the termination areas in the amount of 45% to 65% by volume.
Claim 29
Independent Claim
114 words
A method of making an electrical device wherein a vitreous enamel termination composition is applied to a substrate comprising the steps of preparing a vitreous enamel termination composition comprising a glass frit and finely divided conductive particles selected from the group consisting of molybdenum, tungsten, tantalum and titanium, the metal particles of the termination composition being present in the amount to 45% to 85% by volume, applying a layer of the composition to an insulating substrate, firing the coated substrate in a non oxidizing atmosphere at a temperature sufficient to form an adherent vitreous composite, and cooling the coated substrate to form a termination thereon having a glass matrix with conductive particles dispersed therein.
Claim 30
Independent Claim
114 words
A method of making an electrical device wherein a vitreous enamel termination composition is applied to a substrate comprising the steps of preparing a vitreous enamel termination composition comprising a glass frit and finely divided conductive particles selected from the group consisting of molybdenum, tungsten, tantalum and titanium, the metal particles of the termination composition being present in the amount to 45% to 85% by volume, applying a layer of the composition to an insulating substrate, firing the coated substrate in a non oxidizing atmosphere at a temperature sufficient to form an adherent vitreous composite, and cooling the coated substrate to form a termination thereon having a glass matrix with conductive particles dispersed therein.
Claim 31
Dependent Claim
25 words
The method of claim 22 in which the metal particles of the termination composition are present in the amount of 45% to 65% by volume.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |