US4057777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Termination for electrical resistor and method of making same
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1975-11-19
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Granted: 1977-11-08
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Expires: 1995-11-19
Abstract
Abstract A termination material for a vitreous enamel electrical resistor which includes a mixture of a glass frit and particles of nickel and iron. 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 particles of an alloy of nickel and iron embedded therein. The termination material may be applied to the substrate either before or after the resistance material is applied to the substrate.
Inventors
- 👤 Kenneth M. Merz
- 👤 Howard E. Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:14
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/14; H01B1/16; 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: 42
Claim 1
Independent Claim
25 words
A conductive termination material for electrical components comprising a mixture of fine metal particles of an alloy of nickel and iron and a glass frit.
Claim 2
Dependent Claim
25 words
A conductive termination material for electrical components comprising a mixture of fine metal particles of an alloy of nickel and iron and a glass frit.
Claim 3
Dependent Claim
22 words
A termination material in accordance with claim 1 in which the mixture contains 45% to 72% by volume of the alloy particles.
Claim 4
Dependent Claim
20 words
A termination material in accordance with claim 2 in which the mixture contains 63% by volume of the alloy particles.
Claim 5
Dependent Claim
21 words
A termination material in accordance with claim 2 in which the alloy particles contain 36% to 50% by weight of nickel.
Claim 6
Dependent Claim
21 words
A termination material in accordance with claim 4 in which the alloy particles contain 40% to 45% by weight of nickel.
Claim 7
Dependent Claim
36 words
An electrical termination device for a resistor comprising a substrate, a termination on the substrate, said termination comprising a layer of glass having particles of an alloy of nickel and iron dispersed throughout the glass layer.
Claim 8
Dependent Claim
36 words
An electrical termination device for a resistor comprising a substrate, a termination on the substrate, said termination comprising a layer of glass having particles of an alloy of nickel and iron dispersed throughout the glass layer.
Claim 9
Dependent Claim
22 words
An electrical device in accordance with claim 6 in which the termination contains 45% to 72% by volume of the alloy particles.
Claim 10
Dependent Claim
20 words
An electrical device in accordance with claim 6 in which the termination contains 63% by volume of the alloy particles.
Claim 11
Dependent Claim
20 words
An electrical device in accordance with claim 8 in which the alloy contains 36% to 50% by weight of nickel.
Claim 12
Dependent Claim
20 words
An electrical device in accordance with claim 9 in which the alloy contains 40% to 45% by weight of nickel.
Claim 13
Dependent Claim
21 words
An electrical device in accordance with claim 6 including a film of a resistance material on the substrate contacting the termination.
Claim 14
Dependent Claim
29 words
An electrical device in accordance with claim 11 in which the resistance material comprises a layer of glass having particles of a conductive material dispersed throughout the glass layer.
Claim 15
Dependent Claim
25 words
An electrical device in accordance with claim 12 in which the conductive particles of the resistance material are a mixture of tantalum nitride and tantalum.
Claim 16
Dependent Claim
25 words
An electrical resistor in accordance with claim 12 in which the conductive particles of the resistance material are a mixture of tungsten carbide and tungsten.
Claim 17
Independent Claim
90 words
A method of making an electrical termination device for a resistor 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 of nickel and iron, applying a layer of the composition to an insulating substrate, firing the coated substrate in a non oxidizing atmosphere 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 18
Independent Claim
90 words
A method of making an electrical termination device for a resistor 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 of nickel and iron, applying a layer of the composition to an insulating substrate, firing the coated substrate in a non oxidizing atmosphere 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 19
Dependent Claim
22 words
The method of claim 15 in which the terminal composition is fired in nitrogen at a temperature between 850° and 1200° C.
Claim 20
Dependent Claim
21 words
The method of claim 15 in which the metal particles of the termination mixture are an alloy of nickel and iron.
Claim 21
Dependent Claim
20 words
The method of claim 17 in which the termination composition contains 45% to 72% by volume of the alloy particles.
Claim 22
Dependent Claim
18 words
The method of claim 18 in which the termination composition contains 63% by volume of the alloy particles.
Claim 23
Dependent Claim
22 words
The method of claim 18 in which the alloy particles of the termination composition contain 36% to 50% by weight of nickel.
Claim 24
Dependent Claim
22 words
The method of claim 20 in which the alloy particles of the termination composition contain 40% to 45% by weight of nickel.
Claim 25
Dependent Claim
39 words
The method of claim 15 which includes the step of forming on the substrate in contact with the termination a vitreous enamel resistor comprising a layer of glass having particles of a conductive material dispersed throughout the glass layer.
Claim 26
Dependent Claim
21 words
The method of claim 22 in which the conductive particles of the resistor are a mixture of tantalum nitride and tantalum.
Claim 27
Dependent Claim
21 words
The method of claim 22 in which the conductive particles of the resistor are a mixture of tungsten carbide and tungsten.
Claim 28
Dependent Claim
28 words
The method of claim 22 in which the vitreous enamel resistor is formed on the substrate after the application and firing of the termination layer on the substrate.
Claim 29
Dependent Claim
40 words
The method of claim 22 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 30
Dependent Claim
73 words
An electrical termination device for a resistor made by preparing a vitreous enamel termination composition comprising a glass frit and finely divided conductive particles of nickel and iron, applying a layer of the composition to an insulating substrate. firing the coated substrate in a non oxidizing atmosphere 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
73 words
An electrical termination device for a resistor made by preparing a vitreous enamel termination composition comprising a glass frit and finely divided conductive particles of nickel and iron, applying a layer of the composition to an insulating substrate. firing the coated substrate in a non oxidizing atmosphere 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 32
Dependent Claim
27 words
An electrical device made in accordance with claim 27 in which the terminal composition is fired in nitrogen at a temperature between 850° C and 1200° C.
Claim 33
Dependent Claim
25 words
An electrical device made in accordance with claim 27 in which the metal particles of the termination mixture are an alloy of nickel and iron.
Claim 34
Dependent Claim
24 words
An electrical device made in accordance with claim 29 in which the termination composition contains 45% to 72% by volume of the alloy particles.
Claim 35
Dependent Claim
22 words
An electrical device made in accordance with claim 30 in which the termination composition contains 63% by volume of the alloy particles.
Claim 36
Dependent Claim
26 words
An electrical device made in accordance with claim 30 in which the alloy particles of the termination composition contain 36% to 50% by weight of nickel.
Claim 37
Dependent Claim
26 words
An electrical device made in accordance with claim 32 in which the alloy particles of the termination composition contain 40% to 45% by weight of nickel.
Claim 38
Dependent Claim
43 words
An electrical device made in accordance with claim 27 which includes the step of forming on the substrate in contact with the termination a vitreous enamel resistor comprising a layer of glass having particles of a conductive material dispersed throughout the glass layer.
Claim 39
Dependent Claim
25 words
An electrical device made in accordance with claim 34 in which the conductive particles of the resistor are a mixture of tantalum nitride and tantalum.
Claim 40
Dependent Claim
25 words
An electrical device made in accordance with claim 34 in which the conductive particles of the resistor are a mixture of tungsten carbide and tungsten.
Claim 41
Dependent Claim
32 words
An electrical device made in accordance with claim 34 in which the vitreous enamel resistor is formed on the substrate after the application and firing of the termination layer of the substrate.
Claim 42
Dependent Claim
44 words
An electrical device made in accordance with claim 34 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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |