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US4597897A
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Hexaboride resistor composition
Assignee: EIDP Inc
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Filing: 1985-06-24
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Granted: 1986-07-01
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Expires: 2005-06-24
Abstract
Abstract A composition for the preparation of thick film resistors comprising an admixture of finely divided particles of a conductive metal hexaboride, glass inorganic binder which is substantially irreducible by the metal hexaboride and a small amount of finely divided silica.
Inventors
- 👤 Paul C. Donohue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:17
CPC Classifications
H; H01; H01C; H01C7/00; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06573; H01C17/0658; H01C17/06513; H01C17/06566
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
In a composition for the preparation of thick film resistors comprising an admixture of finely divided particles of conductive metal hexaboride and a glass inorganic binder at least 70 mole % of which binder consists of oxides which are irreducible by the conductive metal hexaboride, the improvement in combination therewith consisting essentially of addition to the admixture of finely divided SiO 2 particles in the amount of 0.3-2.5% wt., basis total solids.
Claim 2
Dependent Claim
72 words
In a composition for the preparation of thick film resistors comprising an admixture of finely divided particles of conductive metal hexaboride and a glass inorganic binder at least 70 mole % of which binder consists of oxides which are irreducible by the conductive metal hexaboride, the improvement in combination therewith consisting essentially of addition to the admixture of finely divided SiO 2 particles in the amount of 0.3-2.5% wt., basis total solids.
Claim 3
Dependent Claim
18 words
The composition of claim 1 in which the finely divided SiO 2 is 0.7-1.5% wt. basis total solids.
Claim 4
Dependent Claim
38 words
The composition of claim 1 in which the inorganic binder is a crystallizable glass comprising 70-95 mole % components which are irreducible by the conductive metal hexaboride having dissolved therein 30-5 mole % Ta 2 O 5 .
Claim 5
Dependent Claim
16 words
The composition of claim 3 in which the crystallizable glass is an alkaline earth metal aluminosilicate.
Claim 6
Dependent Claim
16 words
The composition of claim 4 in which the crystallizable glass is an alkaline earth metal boroaluminosilicate.
Claim 7
Dependent Claim
16 words
The composition of claim 1 in which the glass contains 5-10% Ta 2 O 5 .
Claim 8
Dependent Claim
15 words
The composition of claim 1 in which the conductive metal hexaboride is LaB 6 .
Claim 9
Dependent Claim
20 words
The composition of claim 1 in which the particle size of the conductive metal hexaboride is less than one micron.
Claim 10
Dependent Claim
14 words
A screen printable composition comprising the composition of claim 1 dispersed in organic medium.
References Cited (Backward Citations)
GB1282023A
Cited
US4225648A
Cited
FR2397704A1
Cited
EP0008437B1
Cited
US4260525A
Cited
US4420338A
Cited
US4512917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |