Patent US4209764A successfully refreshed from Google Patents.
US4209764A
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Resistor material, resistor made therefrom and method of making the same
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1978-11-20
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Granted: 1980-06-24
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Expires: 1998-11-20
Abstract
Abstract A vitreous enamel resistor material comprising a mixture of a vitreous glass frit and fine particles of tantalum. The vitreous enamel resistor material may also include fine particles selected from titanium, boron, tantalum oxide (Ta 2 O 5 ), titanium oxide (TiO), barium oxide (BaO 2 ), zirconium dioxide (ZrO 2 ), tungsten trioxide (WO 3 ), tantalum nitride (Ta 2 N), titanium nitride (TiN), molybdenum disilicide (MoSi 2 ), and magnesium silicate MgSiO 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 particles and particles of the additive material, if used, embedded therein and dispersed therethroughout.
Inventors
- 👤 Kenneth M. Merz
- 👤 Howard E. Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:43
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06573; H01C17/0658; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
85 words
A resistor material comprising a mixture of a glass frit, particles of tantalum, and additive particles, said additive particles being present in up to approximately 50% by weight of the tantalum particles and selected from the group consisting of titanium, boron, tantalum oxide (Ta 2 O 5 ), titanium oxide (TiO), barium oxide (BaO 2 ), zirconium dioxide (ZrO 2 ), tungsten trioxide (WO 3 ), tantalum nitride (Ta 2 N), titanium nitride (TiN), molybdenum disilicide (MoSi 2 ), and magnesium silicate (MgSiO 3 ).
Claim 2
Dependent Claim
85 words
A resistor material comprising a mixture of a glass frit, particles of tantalum, and additive particles, said additive particles being present in up to approximately 50% by weight of the tantalum particles and selected from the group consisting of titanium, boron, tantalum oxide (Ta 2 O 5 ), titanium oxide (TiO), barium oxide (BaO 2 ), zirconium dioxide (ZrO 2 ), tungsten trioxide (WO 3 ), tantalum nitride (Ta 2 N), titanium nitride (TiN), molybdenum disilicide (MoSi 2 ), and magnesium silicate (MgSiO 3 ).
Claim 3
Dependent Claim
26 words
A resistor material in accordance with claim 1 in which the tantalum particles are present in the amount of about 28% to about 77% by weight.
Claim 4
Dependent Claim
25 words
A resistor material in accordance with claim 4 in which the tantalum is present in the amount of about 30% to about 73% by weight.
Claim 5
Dependent Claim
55 words
An electrical resistor having a temperature coefficient of resistance which is relatively stable as a function of resistivity comprising a ceramic substrate and a resistor material on a surface of said substrate, said resistor material comprising a film of glass having conductive particles consisting essentially of tantalum metal embedded in and dispersed throughout the glass.
Claim 6
Dependent Claim
55 words
An electrical resistor having a temperature coefficient of resistance which is relatively stable as a function of resistivity comprising a ceramic substrate and a resistor material on a surface of said substrate, said resistor material comprising a film of glass having conductive particles consisting essentially of tantalum metal embedded in and dispersed throughout the glass.
Claim 7
Dependent Claim
24 words
An electrical resistor in accordance with claim 4 in which the resistor material contains about 28% to about 77% by weight of the tantalum.
Claim 8
Dependent Claim
24 words
An electrical resistor in accordance with claim 4 in which the resistor material contains about 30% to about 73% by weight of the tantalum.
Claim 9
Dependent Claim
109 words
An electrical resistor comprising a ceramic substrate and a resistor material on a surface of said substrate, said resistor material comprising a film of glass and particles of tantalum and additive particles embedded in and dispersed throughout the glass film, said additive particles being present in up to approximately 50% by weight of the tantalum particles and selected from the group consisting of titanium, boron, tantalum oxide (Ta 2 O 5 ), titanium oxide (TiO), barium oxide (BaO 2 ), zirconium dioxide (ZrO 2 ), tungsten trioxide (WO 3 ), tantalum nitride (Ta 2 N), titanium nitride (TiN), molybdenum disilicide (MoSi 2 ), and magnesium silicate (MgSiO 3 ).
Claim 10
Dependent Claim
109 words
An electrical resistor comprising a ceramic substrate and a resistor material on a surface of said substrate, said resistor material comprising a film of glass and particles of tantalum and additive particles embedded in and dispersed throughout the glass film, said additive particles being present in up to approximately 50% by weight of the tantalum particles and selected from the group consisting of titanium, boron, tantalum oxide (Ta 2 O 5 ), titanium oxide (TiO), barium oxide (BaO 2 ), zirconium dioxide (ZrO 2 ), tungsten trioxide (WO 3 ), tantalum nitride (Ta 2 N), titanium nitride (TiN), molybdenum disilicide (MoSi 2 ), and magnesium silicate (MgSiO 3 ).
Claim 11
Dependent Claim
24 words
An electrical resistor in accordance with claim 7 in which the resistor material contains about 28% to about 77% by weight of the tantalum.
Claim 12
Dependent Claim
24 words
An electrical resistor in accordance with claim 7 in which the resistor material contains about 30% to about 73% by weight of the tantalum.
Claim 13
Independent Claim
85 words
A method of making an electrical resistor comprising the steps of mixing together a glass frit and particles consisting essentially of tantalum metal, coating the mixture onto the surface of a substrate of an electrical insulating material, firing said coated substrate in a substantially inert atmosphere at a temperature for providing a resistor having a temperature coefficient of resistance which is relatively stable as a function of resistivity and at which the glass frit melts, and then cooling said coated substrate to form the resistor.
Claim 14
Independent Claim
85 words
A method of making an electrical resistor comprising the steps of mixing together a glass frit and particles consisting essentially of tantalum metal, coating the mixture onto the surface of a substrate of an electrical insulating material, firing said coated substrate in a substantially inert atmosphere at a temperature for providing a resistor having a temperature coefficient of resistance which is relatively stable as a function of resistivity and at which the glass frit melts, and then cooling said coated substrate to form the resistor.
Claim 15
Dependent Claim
21 words
The method in accordance with claim 10 in which the mixture contains about 28% to about 77% by weight of tantalum.
Claim 16
Dependent Claim
21 words
The method in accordance with claim 10 in which the mixture contains about 30% to about 73% by weight of tantalum.
Claim 17
Independent Claim
131 words
A method of making an electrical resistor comprising the steps of mixing together a glass frit, and particles of tantalum, and particles of an additive material selected from the group consisting of titanium, boron, tantalum oxide (Ta 2 O 5 ), titanium oxide (TiO), barium oxide (BaO 2 ), zirconium dioxide (ZrO 2 ), tungsten trioxide (WO 3 ), tantalum nitride (Ta 2 N), titanium nitride (TiN), molybdenum disilicide (MoSihd 2), and magnesium silicate (MgSiO 3 ), the additive particles being present in up to approximately 50% by weight of the tantalum particles, coating the mixture onto the surface of a substrate of an electrical insulating material, firing said coated substrate in a substantially inert atmosphere at a temperature at which the glass frit melts, and then cooling said coated substrate.
Claim 18
Independent Claim
131 words
A method of making an electrical resistor comprising the steps of mixing together a glass frit, and particles of tantalum, and particles of an additive material selected from the group consisting of titanium, boron, tantalum oxide (Ta 2 O 5 ), titanium oxide (TiO), barium oxide (BaO 2 ), zirconium dioxide (ZrO 2 ), tungsten trioxide (WO 3 ), tantalum nitride (Ta 2 N), titanium nitride (TiN), molybdenum disilicide (MoSihd 2), and magnesium silicate (MgSiO 3 ), the additive particles being present in up to approximately 50% by weight of the tantalum particles, coating the mixture onto the surface of a substrate of an electrical insulating material, firing said coated substrate in a substantially inert atmosphere at a temperature at which the glass frit melts, and then cooling said coated substrate.
Claim 19
Dependent Claim
25 words
The method in accordance with claim 13 in which the tantalum particles are present in the amount of about 28% to about 77% by weight.
Claim 20
Dependent Claim
25 words
The method in accordance with claim 13 in which the tantalum particles are present in the amount of about 30% to about 73% by weight.
Claim 21
Dependent Claim
82 words
An electrical resistor made by the steps of mixing together a glass frit and particles consisting essentially of tantalum metal, coating the mixture onto the surface of a substrate of an electrical insulating material, firing said coated substrate in a substantially inert atmosphere at a temperature for providing a resistor having a temperature coefficient of resistance which is relatively stable as a function of resistivity and at which the glass frit melts, and then cooling said coated substrate to form the resistor.
Claim 22
Dependent Claim
82 words
An electrical resistor made by the steps of mixing together a glass frit and particles consisting essentially of tantalum metal, coating the mixture onto the surface of a substrate of an electrical insulating material, firing said coated substrate in a substantially inert atmosphere at a temperature for providing a resistor having a temperature coefficient of resistance which is relatively stable as a function of resistivity and at which the glass frit melts, and then cooling said coated substrate to form the resistor.
Claim 23
Dependent Claim
23 words
An electrical resistor made in accordance with claim 16 in which the mixture contains about 28% to about 77% by weight of tantalum.
Claim 24
Dependent Claim
23 words
An electrical resistor made in accordance with claim 16 in which the mixture contains about 30% to about 73% by weight of tantalum.
Claim 25
Dependent Claim
128 words
An electrical resistor made by the steps of mixing together a glass frit, and particles of tantalum, and particles of an additive material selected from the group consisting of titanium, boron, tantalum oxide (Ta 2 O 5 ), titanium oxide (TiO), barium oxide (BaO 2 ), tantalum nitride (Ta 2 N), titanium nitride (TiN), zirconium dioxide (ZrO 2 ), tungsten trioxide (WO 3 ), molybdenum disilicide (MoSi 2 ), and magnesium silicate (MgSiO 3 ), the additive particles being present in up to approximately 50% by weight of the tantalum particles, coating the mixture onto the surface of a substrate of an electrical insulating material, firing said coated substrate in an inert atmosphere at a temperature at which the glass frit melts, and then cooling said coated substrate.
Claim 26
Dependent Claim
128 words
An electrical resistor made by the steps of mixing together a glass frit, and particles of tantalum, and particles of an additive material selected from the group consisting of titanium, boron, tantalum oxide (Ta 2 O 5 ), titanium oxide (TiO), barium oxide (BaO 2 ), tantalum nitride (Ta 2 N), titanium nitride (TiN), zirconium dioxide (ZrO 2 ), tungsten trioxide (WO 3 ), molybdenum disilicide (MoSi 2 ), and magnesium silicate (MgSiO 3 ), the additive particles being present in up to approximately 50% by weight of the tantalum particles, coating the mixture onto the surface of a substrate of an electrical insulating material, firing said coated substrate in an inert atmosphere at a temperature at which the glass frit melts, and then cooling said coated substrate.
Claim 27
Dependent Claim
27 words
An electrical resistor made in accordance with claim 19 in which the tantalum particles are present in the amount of about 28% to about 77% by weight.
Claim 28
Dependent Claim
23 words
An electrical resistor made in accordance with claim 19 in which the mixture contains about 30% to about 73% by weight of tantalum.
References Cited (Backward Citations)
US3394087A
Cited
US4053866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |