US5122302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thick film NTC thermistor compositions
Assignee: EIDP Inc
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Filing: 1991-09-30
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Granted: 1992-06-16
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Expires: 2011-09-30
Abstract
Abstract Thick film thermistor paste comprising an admixture of finely divided particles consisting essentially of a) a conductive phase consisting of (1) at least one oxide of a platinum group metal having a positive TCR, and (2) Co 2 RuO 4 , b) an inorganic binder having a Dilatometer softening point of 450°-750° C. which contains transition metal oxides and is free of alkali metal oxides, c) a filler selected from vitreous silica, zircon and mixtures thereof, all of (a) through (c) being dispersed in, d) an organic medium.
Inventors
- 👤 Jacob Hormadaly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:47
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C7/00; H01C7/02; H01C7/022; H01C7/023; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C8/00; C03C8/02; C03C8/10; C03C8/14; C03C8/20; C03C8/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
A thick film resistor paste comprising an admixture of finely divided particles consisting essentially, based on the total weight of the solids, of: A. 20-60% weight of a conductive phase consisting essentially of: (1) at least one oxide of a platinum group metal having a positive TCR, and (2) Co 2 RuO 4 in which the ratio of (1) to (2) is from 0.03 to 0.25; B. 75-20% weight of an inorganic binder having a softening point below 700° C., which is free of alkali metal oxides and contains 1-10 mole % oxide(s) of transition metals having atomic numbers 22 to 28, 41, 42 and 74; C. 5-20% weight fillers selected from vitreous silica, zircon and mixtures thereof; all of A, B and C being dispersed in: D. an organic medium.
Claim 2
Dependent Claim
131 words
A thick film resistor paste comprising an admixture of finely divided particles consisting essentially, based on the total weight of the solids, of: A. 20-60% weight of a conductive phase consisting essentially of: (1) at least one oxide of a platinum group metal having a positive TCR, and (2) Co 2 RuO 4 in which the ratio of (1) to (2) is from 0.03 to 0.25; B. 75-20% weight of an inorganic binder having a softening point below 700° C., which is free of alkali metal oxides and contains 1-10 mole % oxide(s) of transition metals having atomic numbers 22 to 28, 41, 42 and 74; C. 5-20% weight fillers selected from vitreous silica, zircon and mixtures thereof; all of A, B and C being dispersed in: D. an organic medium.
Claim 3
Dependent Claim
15 words
The composition of claim 1 in which the inorganic binder is a lead aluminoborosilicate glass.
Claim 4
Dependent Claim
17 words
The composition of claim 1 in which the filler is a mixture of vitreous silica and zircon.
Claim 5
Dependent Claim
16 words
The composition of claim 1 in which the platinum group metal oxide is a ruthenium-based oxide.
Claim 6
Dependent Claim
14 words
The composition of claim 4 in which the ruthenium-based oxide is RuO 2 .
Claim 7
Dependent Claim
14 words
The composition of claim 4 in which the ruthenium-based oxide is a pyrochlore-type compound.
Claim 8
Dependent Claim
14 words
The composition of claim 6 in which the pyrochlore-type compound is lead bismuth ruthenate.
Claim 9
Dependent Claim
19 words
The composition of claim 6 in which the inorganic binder has a Dilatometer softening point of below 600° C.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-06-16 | 1995-12-16 | 1996-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-16 | 1999-12-16 | 2000-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-16 | 2003-12-16 | 2004-06-16 | $7700.00 | Window Closed / Lapsed |