Patent US4303742A successfully refreshed from Google Patents.
US4303742A
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Resistance material
Assignee: US Philips Corp
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Filing: 1980-03-05
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Granted: 1981-12-01
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Expires: 2000-03-05
Abstract
Abstract Resistance material comprising a mixture of metal oxidic compounds, metal oxides, a permanent binder and a temporary binder, the resistance-determining component consisting of at least one component having the formula MxSr1-xRh2O4-4.5 in which M is selected from Pb and Bi and wherein 1/2>x>0. By combining this component with a material having an opposite TCR, a resistor having a very small TCR is obtained. This resistor is formed by firing this resistance material on a substrate.
Inventors
- 👤 Alexander H. Boonstra
- 👤 Cornelis A. H. A. Mutsaers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:52
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654; H01C7/00; H01C7/02; H01C7/021; H01C7/04; H01C7/042; H01C7/043; H01C7/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
A resistance material comprising at least one compound having the formula M x Sr 1-x Rh 2 O 4-4 .5 wherein M is selected from the group consisting of Pb and Bi, and wherein x is between 0 and 1/2.
Claim 2
Dependent Claim
40 words
A resistance material comprising at least one compound having the formula M x Sr 1-x Rh 2 O 4-4 .5 wherein M is selected from the group consisting of Pb and Bi, and wherein x is between 0 and 1/2.
Claim 3
Dependent Claim
15 words
A resistance material as claimed in claim 1, wherein x is between 0.05 and 0.45.
Claim 4
Dependent Claim
23 words
A resistor comprising a resistor body provided with leads, said resistor body comprising a resistance material as claimed in claim 1 or 2.
Claim 5
Dependent Claim
57 words
A resistance material comprising a mixture of a permanent binder, a temporary binder, and a resistance-determining component, said resistance-determining component comprising at least one compound having the formula M x Sr 1-x Rh 2 O 4-4 .5 wherein M is selected from the group consisting of Pb and Bi, and wherein x is between 0 and 1/2.
Claim 6
Dependent Claim
57 words
A resistance material comprising a mixture of a permanent binder, a temporary binder, and a resistance-determining component, said resistance-determining component comprising at least one compound having the formula M x Sr 1-x Rh 2 O 4-4 .5 wherein M is selected from the group consisting of Pb and Bi, and wherein x is between 0 and 1/2.
Claim 7
Dependent Claim
15 words
A resistance material as claimed in claim 4, wherein x is between 0.05 and 0.45.
Claim 8
Dependent Claim
62 words
A resistance material as claimed in claim 1, 2, 4, or 5, wherein the material comprises at least two such compounds, at least one of the compounds having a negative temperature coefficient of resistance, at least one other compound having a positive temperature coefficient of resistance, the ratio of these two compounds being chosen to achieve a desired temperature coefficient of resistance.
Claim 9
Dependent Claim
57 words
A resistance material as claimed in claim 1, 2, 4 or 5, wherein M and Pb and wherein the material further comprises a substance having a negative temperature coefficient of resistance, said substance being a metal rhodate having a composition defined by the formula M' 3 Rh 7 O 15 , wherein M' is Pb or Sr.
Claim 10
Dependent Claim
53 words
A resistor comprising a resistor body provided with leads, said resistor body comprising a substrate bearing a resistance material as claimed in claim 9 or 10, said resistor body having been produced by heating the substrate and the resistance material so as to remove the temporary binder and form a coherent resistive layer.
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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |