US4301042A
Expired / Lapsed
US
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Resistance material
Assignee: US Philips Corp
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Filing: 1980-03-05
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Granted: 1981-11-17
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Expires: 2000-03-05
Abstract
Abstract A resistance material comprising a mixture of a permanent binder, a temporary binder and a bismuth-strontium rhodate having a composition defined by the formula Bi x Sr 1-x Rh 2 .5 O 5-5 .5 wherein 1/2>x>O as a resistance determining component. This component has a linear positive temperature coefficient of resistance (TCR). A resistor having a very low TCR may be made using a mixture of this resistance-determining material with a resistance-determining component having a negative TCR. The resistor is produced 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 17:34
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654; H01C7/02; H01C7/021
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
32 words
A resistance material comprising a bismuth-strontium rhodate compound having a composition defined by the formula Bi x Sr 1-x Rh 2 .5 O 5-5 .5, wherein x is between 0 and 1/2.
Claim 2
Dependent Claim
32 words
A resistance material comprising a bismuth-strontium rhodate compound having a composition defined by the formula Bi x Sr 1-x Rh 2 .5 O 5-5 .5, 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
21 words
A resistor having a resistor body provided with leads, said resistor body comprising the resistance material of claim 1 or 2.
Claim 5
Dependent Claim
48 words
A resistance material comprising a mixture of a permanent binder, a temporary binder and a resistance-determining component, said resistance-determining component comprising a bismuth-strontium rhodate having a composition defined by the formula Bi x Sr 1-x Rh 2 .5 O 5-5 .5, wherein x is between 0 and 1/2.
Claim 6
Dependent Claim
48 words
A resistance material comprising a mixture of a permanent binder, a temporary binder and a resistance-determining component, said resistance-determining component comprising a bismuth-strontium rhodate having a composition defined by the formula Bi x Sr 1-x Rh 2 .5 O 5-5 .5, 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
24 words
A resistance material as claimed in claim 1, 2, 4 or 5, further comprising a resistance-determining component having a negative temperature coefficient of resistance.
Claim 9
Dependent Claim
43 words
A resistance material as claimed in claim 6, wherein the resistance-determining component having a negative temperature coefficient of resistance is 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
46 words
A resistance material as claimed in claim 6, wherein the resistance-determining component having a negative temperature coefficient of resistance is a metal rhodate having a composition defined by the formula Bi x Sr 1-x Rh 2 O 4-4 .5, wherein x is between 0 and 1/2.
Claim 11
Dependent Claim
52 words
A resistor having a resistor body provided with leads, said resistor body comprising a substrate bearing a resistance material as claimed in claim 4 or 5, said resistor body having been produced by heating the substrate and 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) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |