US3928245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal oxide voltage-variable resistor composition
Assignee: General Electric Co
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Filing: 1973-07-09
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Granted: 1975-12-23
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Expires: 1993-07-09
Abstract
Abstract A metal oxide resistor of the type consisting essentially of zinc oxide and containing significant amounts of the impurities bismuth trioxide, cobalt trioxide, manganese dioxide, antimony oxide, chromic oxide, and silicon dioxide contains also significant amounts of the impurities barium oxide and boron oxide.
Inventors
- 👤 Herbert Fishman
- 👤 James S Kresge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:29
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
51 words
A VOLTAGE-VARIBLE SINTERED BODY RESISTOR COMPOSITION OF THE TYPE CONSISTING MOSTLY OF ZINC OXIDE AND COMPRISING A SIGNIFICANT AMOUNT OF SILICON DIOXIDE, WHEREIN THE IMPROVEMENT COMPRISES THAT SAID COMPOSITION ALSO CONTAINS SIGNIFICANT AMOUNTS OF AT LEST ONE OF THE IMPURITIES CHOOSEN FROM THE GROUP CONSISTING OF BARIUM OXIDE AND BORON OXIDE.
Claim 2
Dependent Claim
51 words
A VOLTAGE-VARIBLE SINTERED BODY RESISTOR COMPOSITION OF THE TYPE CONSISTING MOSTLY OF ZINC OXIDE AND COMPRISING A SIGNIFICANT AMOUNT OF SILICON DIOXIDE, WHEREIN THE IMPROVEMENT COMPRISES THAT SAID COMPOSITION ALSO CONTAINS SIGNIFICANT AMOUNTS OF AT LEST ONE OF THE IMPURITIES CHOOSEN FROM THE GROUP CONSISTING OF BARIUM OXIDE AND BORON OXIDE.
Claim 3
Dependent Claim
23 words
The composition defined in claim 1 wherein the barium oxide is present to a concentration of on the order of 0.1 molar percent.
Claim 4
Dependent Claim
24 words
The composition defined in claim 1 wherein the boron oxide is present to a concentration of on the order of about 0.1 molar percent.
Claim 5
Dependent Claim
30 words
THE COMPOSITION DEFINED IN CLAIM 1 AND COMPRISING ADDITIONALLY AT LEAST ONE IMPURITY CHOSEN FROM THE GROUP CONSISTING OF BISMUTH TRIOXIDE, COBALTIC TRIOXIDE, MANGANESE DIOIDE, ANTIMONY OXIDE, AND CHROMIC OXIDE.
Claim 6
Dependent Claim
63 words
The composition defined in claim 4 and comprising: about 96.3 molar percent zinc oxide, about 0.5 molar percent bismuth trioxide, about 0.5 molar percent cobaltic trioxide, about 0.5 molar percent manganese dioxide, about 1.0 molar percent antimony trioxide, about 0.5 molar percent chromic oxide, about 0.1 molar percent barium oxide, about 0.1 molar percent boron oxide, and about 0.25 molar percent silicon dioxide.
References Cited (Backward Citations)
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |