Patent US4548742A successfully refreshed from Google Patents.
US4548742A
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Resistor compositions
Assignee: EIDP Inc
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Filing: 1983-12-19
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Granted: 1985-10-22
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Expires: 2003-12-19
Abstract
Abstract Thick film resistor composition which is a dispersion of (a) a conductive phase of a nonprecious metal pyrochlore and SnO2, (b) inorganic binder and (c) CoCrO4 and/or NiCrO4 in (d) organic medium. The metal chromate functions as a TCR driver.
Inventors
- 👤 Jacob Hormadaly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:01
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C8/00; C03C8/14; H01C7/00; H01C7/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31627
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A thick film resistor composition comprising an admixture of finely divided particles of (a) 40-85% wt. of a conductive phase consisting essentially of 1-95% wt. of a pyrochlore corresponding to the formula: Sn.sub.2-x.sup.2.spsp.+ Ta.sub.Y.sbsb.3 Nb.sub.Y.sbsb.2 Sn.sub.Y.sbsb.1.sup.4.spsp.+ O.sub.7-x-y.sbsb.1/2.sup.4, wherein x=0-0.55 Y 3 =0-2 Y 2 =0-2 Y 1 =0-0.5 and Y 1 +Y 2 +Y 3 =2 or precursive mixtures thereof and 99-1% wt. SnO 2 ; (b) 60-15% wt. inorganic binder, and (c) 0.05-10% wt. CoCrO 4 , NiCrO 4 or mixtures thereof, dispersed in (d) an organic medium.
Claim 2
Dependent Claim
89 words
A thick film resistor composition comprising an admixture of finely divided particles of (a) 40-85% wt. of a conductive phase consisting essentially of 1-95% wt. of a pyrochlore corresponding to the formula: Sn.sub.2-x.sup.2.spsp.+ Ta.sub.Y.sbsb.3 Nb.sub.Y.sbsb.2 Sn.sub.Y.sbsb.1.sup.4.spsp.+ O.sub.7-x-y.sbsb.1/2.sup.4, wherein x=0-0.55 Y 3 =0-2 Y 2 =0-2 Y 1 =0-0.5 and Y 1 +Y 2 +Y 3 =2 or precursive mixtures thereof and 99-1% wt. SnO 2 ; (b) 60-15% wt. inorganic binder, and (c) 0.05-10% wt. CoCrO 4 , NiCrO 4 or mixtures thereof, dispersed in (d) an organic medium.
Claim 3
Dependent Claim
20 words
The composition of claim 1 in which (a) is 60-80% wt., (b) is 40-20% wt. and (c) is 0.05-2.5% wt.
Claim 4
Dependent Claim
20 words
The composition of claim 1 in which the conductive phase contains 2-50% wt. pyrochlore and 90-50% wt. SnO 2 .
Claim 5
Dependent Claim
10 words
The composition of claim 1 in which Y 2 =0.
Claim 6
Dependent Claim
15 words
The composition of claim 1 in which the chromate comprises 0.05-2.5% wt. of the solids.
Claim 7
Dependent Claim
62 words
A resistor element made by (a) forming on a substrate a patterned thin layer of the composition of claim 1; (b) drying the layer of step (a); and (c) firing the dried layer of step (b) in a nonoxidizing atmosphere to effect volatilization of the organic medium, decomposition of the metal chromate and sintering of the inorganic binder and the conductive phase.
References Cited (Backward Citations)
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Cited
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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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |