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US3914514A
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Termination for resistor and method of making the same
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1973-08-16
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Granted: 1975-10-21
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Expires: 1993-08-16
Abstract
Abstract A method of making a resistor termination comprising the steps of applying to the surface of a substrate and firing a mixture of glass frit and particles of a compound taken from the group consisting of ruthenium oxide, iridium oxide, and rhodium oxide and mixtures thereof, until the compound dissociates to form and sinter the metal. The mixture is fired at a temperature of at least 900*C and preferably at 1,150*C in a reducing or nonoxidizing atmosphere such as that provided by nitrogen. When cooled there is provided a glass film with metal particles therein strongly bonded to the substrate.
Inventors
- 👤 George D Mackenzie
- 👤 Michael G Noblett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:47
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/28; H01C17/281; H01C17/283; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
A METHOD OF MAKING A TERMINATION FOR REFRACTORY METAL GLAZE RESISTORS COMPRISING THE STEPS OF: A. APPLYING TO THE SURFACE OF A SUBSTRATE A MIXTURE OF A GLASS FRIT AND PARTICLES OF A COMPOUND TAKEN FROM THE GROUP CONSISTING OF RUTHENIUM OXIDE, IRIDIUM OXIDE, RHODIUM OXIDE, AND MIXTURES THEREOF, THE METAL OXIDE PARTICLES BEING PRESENT IN THE AMOUNT OF 79% BY WEIGHT AND B. FIRING THE MIXTURE AT A TEMPERATURE OF AT LEAST 900*C IN
Claim 2
Independent Claim
75 words
A METHOD OF MAKING A TERMINATION FOR REFRACTORY METAL GLAZE RESISTORS COMPRISING THE STEPS OF: A. APPLYING TO THE SURFACE OF A SUBSTRATE A MIXTURE OF A GLASS FRIT AND PARTICLES OF A COMPOUND TAKEN FROM THE GROUP CONSISTING OF RUTHENIUM OXIDE, IRIDIUM OXIDE, RHODIUM OXIDE, AND MIXTURES THEREOF, THE METAL OXIDE PARTICLES BEING PRESENT IN THE AMOUNT OF 79% BY WEIGHT AND B. FIRING THE MIXTURE AT A TEMPERATURE OF AT LEAST 900*C IN
Claim 3
Dependent Claim
24 words
The method in accordance with claim 1 in which the mixture is fired at a temperature of at least 900*C in a nitrogen atmosphere.
Claim 4
Dependent Claim
21 words
The method in accordance with claim 1 in which the mixture is fired at a temperature of between 1,100*C to 1,150*C.
Claim 5
Dependent Claim
34 words
The method in accordance with claim 2 in which the metal oxide particles are present in the mixture, such that the amount of metal in the termination is between 60% and 92% by volume.
Claim 6
Dependent Claim
35 words
The method in accordance with claim 4 in which copper particles are present in the mixture and in which of the metal oxide and copper particles no greater than 5% are of the copper particles.
Claim 7
Dependent Claim
19 words
The method in accordance with claim 5 in which the copper particles include particles of copper and copper oxide.
Claim 8
Dependent Claim
61 words
A termination film for an electrical refractory metal glaze resistor consisting of a glass film bonded to the surface of an insulating substrate, and particles of metal from the group consisting of ruthenium, iridium and rhodium, and mixtures thereof, embedded within and dispersed throughout the glass film, the metal particles being present in the amount of 60% to 92% by volume.
Claim 9
Dependent Claim
61 words
A termination film for an electrical refractory metal glaze resistor consisting of a glass film bonded to the surface of an insulating substrate, and particles of metal from the group consisting of ruthenium, iridium and rhodium, and mixtures thereof, embedded within and dispersed throughout the glass film, the metal particles being present in the amount of 60% to 92% by volume.
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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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |