US3816348A
Expired / Lapsed
US
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Compositions for stable low resistivity resistors
Assignee: EIDP Inc
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Filing: 1972-07-25
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Granted: 1974-06-11
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Expires: 1992-07-25
Abstract
Abstract In finely divided resistor compositions containing dielectric material and a resistive oxide which is a polynary oxide of the approximate formula A2B2O7, improved compositions additionally comprising finely divided SiO2 or Al2O3 to enhance stability of resistors made therewith. Resistors of such compositions fired on ceramic substrates.
Inventors
- 👤 M Popowich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:29
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654; H01C7/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
13 words
Compositions according to claim 1 wherein the additive oxide is Al2O3 as corundum.
Claim 2
Dependent Claim
11 words
Compositions according to claim 1 wherein the additive oxide is SiO2.
Claim 3
Dependent Claim
10 words
Compositions of claim 1 dispersed in an inert liquid vehicle.
Claim 4
Dependent Claim
10 words
Compositions of claim 2 dispersed in an inert liquid vehicle.
Claim 5
Dependent Claim
10 words
Compositions of claim 3 dispersed in an inert liquid vehicle.
Claim 6
Dependent Claim
19 words
Compositions according to claim 2 wherein the average particle size of the Al2O3 is in the range 0.3-4 microns.
Claim 7
Dependent Claim
73 words
Improved film resistors on dielectric substrates, useful in electronic circuits, which resistors exhibit reduced room temperature resistivity drift, said resistors comprising the resistive metal oxides of claim 1, dielectric material, and, as an additive oxide, Al2O3 as corundum, SiO2 or mixtures thereof, in amounts ranging from 2 up to 25 percent, based on the weight of the resistive metal oxide, the additive oxide having an average particle size in the range 0.1-5 microns.
Claim 8
Dependent Claim
14 words
Improved resistors according to claim 8 wherein the additive oxide is Al2O3 as corundum.
Claim 9
Dependent Claim
12 words
Improved resistors according to claim 8 wherein the additive oxide is SiO2.
Claim 10
Dependent Claim
85 words
Improved film resistors on dielectric substrates, useful in electronic circuits, said resistors comprising the resistive metal oxide of claim 1, dielectric material and, as an additive oxide, Al2O3 as corundum, SiO2 or mixtures thereof, the additive metal oxide being in an amount effective to reduce room temperature resistivity drift, the amount of the additive oxide being up to about 25 percent by weight, based on the weight of said resistive metal oxides, said additive oxide having an average particle size in the range 0.1-5 microns.
Claim 11
Dependent Claim
14 words
Improved resistors according to claim 11 wherein the additive oxide is Al2O3 as corundum.
Claim 12
Dependent Claim
12 words
Improved resistors according to claim 11 wherein the additive oxide is SiO2.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |