US4286251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitreous enamel resistor and method of making the same
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1979-03-05
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Granted: 1981-08-25
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Expires: 1999-03-05
Abstract
Abstract A vitreous enamel resistor, and method of making the same comprising the steps of applying to the surface of a substrate and firing a mixture of glass frit and particles of a precious metal oxide such as iridium oxide, ruthenium oxide, and mixtures thereof. The mixture is fired in a neutral, inert, or reducing atmosphere for a time and at a temperature resulting in a controlled partial dissociation of the oxide and softening of the glass frit. When cooled, a resistor is provided having a glass film with conductive particles therein strongly bonded to the substrate. The resistor produced can be terminated by the use of electroless plating.
Inventors
- 👤 Robert G. Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:27
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49101
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
97 words
A method of making an electrical resistor comprising the steps of (a) coating the surface of an insulating substrate with a mixture of a glass frit and particles of a metal oxide selected from the group consisting of iridium oxide, ruthenium oxide, and mixtures thereof, (b) firing the mixture in an atmosphere and at a temperature to provide a controlled degree of dissociation of the oxide particles, and then (c) cooling the coated substrate to form a resistor film of glass having conductive particles dispersed therethrough and characterized by being terminable by an electroless plated metal film.
Claim 2
Independent Claim
97 words
A method of making an electrical resistor comprising the steps of (a) coating the surface of an insulating substrate with a mixture of a glass frit and particles of a metal oxide selected from the group consisting of iridium oxide, ruthenium oxide, and mixtures thereof, (b) firing the mixture in an atmosphere and at a temperature to provide a controlled degree of dissociation of the oxide particles, and then (c) cooling the coated substrate to form a resistor film of glass having conductive particles dispersed therethrough and characterized by being terminable by an electroless plated metal film.
Claim 3
Dependent Claim
26 words
The method in accordance with claim 1 in which the mixture is fired at a temperature of at least 600° C. in a substantially neutral atmosphere.
Claim 4
Dependent Claim
26 words
The method in accordance with claim 1 in which the mixture is fired at a temperature of at least 600° C. in a substantially reducing atmosphere.
Claim 5
Dependent Claim
24 words
The method in accordance with claim 1 in which the mixture is fired at a temperature of 600° C. in a substantially nitrogen atmosphere.
Claim 6
Dependent Claim
23 words
The method in accordance with claim 4 in which the nitrogen atmosphere includes air for controlling the degree of dissociation of the particles.
Claim 7
Dependent Claim
28 words
The method in accordance with claim 1, 2, 3, 4, or 5 in which the mixture is fired at a temperature of between 1000° C. to 1100° C.
Claim 8
Dependent Claim
27 words
The method in accordance with claim 1 in which the metal oxide particles are present in the mixture in an amount of 10 to 70% by weight.
Claim 9
Dependent Claim
29 words
The method in accordance with claim 1 in which the metal oxide and dissociated particles are present in the mixture in an amount of 20 to 50% by weight.
Claim 10
Dependent Claim
26 words
The method in accordance with claim 1 which includes the step of forming a conductive termination layer in contact with the resistor film by electroless plating.
Claim 11
Dependent Claim
55 words
The method in accordance with claim 1, 2, 3, 7, or 8 in which the glass film includes particles containing iridium and ruthenium, the particles containing iridium being present in an amount of 70-90% by weight and the particles containing ruthenium being present in an amount of 5-30% by weight of the metal containing particles.
Claim 12
Dependent Claim
19 words
The method in accordance with claim 1, 2 or 3 in which the film is of a borosilicate glass.
Claim 13
Dependent Claim
94 words
An electrical resistor made by the steps of (a) coating the surface of an insulating substrate with a mixture of a glass frit and particles of a metal oxide selected from the group consisting of iridium oxide, ruthenium oxide, and mixtures thereof, (b) firing the mixture in an atmosphere and at a temperature to provide a controlled degree of dissociation of the oxide particles, and then (c) cooling the coated substrate to form a resistor film of glass having conductive particles dispersed therethrough and characterized by being terminable by an electroless plated metal film.
Claim 14
Dependent Claim
94 words
An electrical resistor made by the steps of (a) coating the surface of an insulating substrate with a mixture of a glass frit and particles of a metal oxide selected from the group consisting of iridium oxide, ruthenium oxide, and mixtures thereof, (b) firing the mixture in an atmosphere and at a temperature to provide a controlled degree of dissociation of the oxide particles, and then (c) cooling the coated substrate to form a resistor film of glass having conductive particles dispersed therethrough and characterized by being terminable by an electroless plated metal film.
Claim 15
Dependent Claim
28 words
An electrical resistor made in accordance with claim 12 in which the mixture is fired at a temperature of at least 600° C. in a substantially neutral atmosphere.
Claim 16
Dependent Claim
28 words
An electrical resistor made in accordance with claim 12 in which the mixture is fired at a temperature of at least 600° C. in a substantially reducing atmosphere.
Claim 17
Dependent Claim
26 words
An electrical resistor made in accordance with claim 12 in which the mixture is fired at a temperature of 600° C. in a substantially nitrogen atmosphere.
Claim 18
Dependent Claim
25 words
An electrical resistor made in accordance with claim 15 in which the nitrogen atmosphere includes air for controlling the degree of dissociation of the particles.
Claim 19
Dependent Claim
30 words
An electrical resistor made in accordance with claim 12, 13, 14, 15, or 16 in which the mixture is fired at a temperature of between 1000° C. to 1100° C.
Claim 20
Dependent Claim
29 words
An electrical resistor made in accordance with claim 12 in which the metal oxide particles are present in the mixture in an amount of 10 to 70% by weight.
Claim 21
Dependent Claim
31 words
An electrical resistor made in accordance with claim 12 in which the metal oxide and dissociated particles are present in the mixture in an amount of 20 to 50% by weight.
Claim 22
Dependent Claim
28 words
An electrical resistor made in accordance with claim 12 which includes the step of forming a conductive termination film in contact with the resistor film by electroless plating.
Claim 23
Dependent Claim
57 words
An electrical resistor made in accordance with claim 12, 13, 14, 18, or 19 in which the glass film includes particles containing iridium and ruthenium, the particles containing iridium being present in an amount of 70-95% by weight and the particles containing ruthenium being present in an amount of 5-30% by weight of the metal containing particles.
Claim 24
Dependent Claim
21 words
An electrical resistor made in accordance with claim 12, 13, or 14 in which the film is of a borosilicate glass.
Claim 25
Dependent Claim
88 words
An electrical resistor characterized by being terminable by an electroless plated metal film comprising an insulating substrate, and a glass film on a surface of the substrate, the glass film having particles of metal oxide selected from the group consisting of an oxide of iridium, an oxide of ruthenium, and mixtures thereof, together with particles of the metal of the oxide particles, embedded within and dispersed throughout the glass film, which the metal oxide and metal particles are present in an amount of 10 to 70% by weight.
Claim 26
Dependent Claim
88 words
An electrical resistor characterized by being terminable by an electroless plated metal film comprising an insulating substrate, and a glass film on a surface of the substrate, the glass film having particles of metal oxide selected from the group consisting of an oxide of iridium, an oxide of ruthenium, and mixtures thereof, together with particles of the metal of the oxide particles, embedded within and dispersed throughout the glass film, which the metal oxide and metal particles are present in an amount of 10 to 70% by weight.
Claim 27
Dependent Claim
25 words
The electrical resistor of claim 23 in which the metal oxide and metal particles are present in an amount of 20 to 50% by weight.
Claim 28
Dependent Claim
51 words
The electrical resistor of claim 23 or 24 in which the glass film includes particles containing iridium and ruthenium, the particles containing iridium being present in an amount of 70-95% by weight and the particles containing ruthenium being present in an amount of 5-30% by weight of the metal containing particles.
Claim 29
Dependent Claim
18 words
The electrical resistor of claim 23 or 24 in which the glass film is of a borosilicate glass.
Claim 30
Dependent Claim
20 words
The electrical resistor of claim 23 or 24 in which the glass film is of an alkaline earth borosilicate glass.
Claim 31
Dependent Claim
20 words
The electrical resistor of claim 23 or 24 which includes a metal termination film in contact with the glass film.
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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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |