US3947277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplex resistor inks
Assignee: Universal Oil Products Co
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Filing: 1973-12-19
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Granted: 1976-03-30
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Expires: 1993-12-19
Abstract
Abstract Electrical resistor inks comprising a mixture of a semi-conducting pyropolymeric inorganic material and a transition metal oxide along with a vehicle consisting of a binder such as a synthetic resin or a varnish and a suitable solvent or oil, etc. are useful in forming resistors in electrical circuits, the resistor ink possessing a temperature coefficient of resistance of less than about 500 ppm/° C.
Inventors
- 👤 Robert D. Carnahan
- 👤 Karl J. Youtsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:11
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/02; H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/0652
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
146 words
An electrical resistor ink possessing a temperature coefficient of resistance of from about +500 ppm/° C to about -500 ppm/° C comprising a resistive component and a vehicle containing a binder of synthetic or natural resin and a solvent, oil or mixture thereof, said resistive component comprising from about 10% to about 97% of a mixture of an alumina or silica-alumina base having a mono-layer of a carbonaceous pyropolymer on the surface thereof and an oxide of a transition metal selected from the group consisting of titanium, zirconium, vanadium, chromium, tungsten, niobium, tantalum, rhenium, osmium, ruthenium, rhodium, molybdenum, iridium, calcium, lanthanum, strontium, barium, and cadmium, the weight percent of semiconducting pyropolymeric inorganic refractory oxide material in said resistive component being in the range of from about 25% to about 90%, and said vehicle of said resistor ink upon drying providing electrical continuity between the resistive components.
Claim 2
Dependent Claim
146 words
An electrical resistor ink possessing a temperature coefficient of resistance of from about +500 ppm/° C to about -500 ppm/° C comprising a resistive component and a vehicle containing a binder of synthetic or natural resin and a solvent, oil or mixture thereof, said resistive component comprising from about 10% to about 97% of a mixture of an alumina or silica-alumina base having a mono-layer of a carbonaceous pyropolymer on the surface thereof and an oxide of a transition metal selected from the group consisting of titanium, zirconium, vanadium, chromium, tungsten, niobium, tantalum, rhenium, osmium, ruthenium, rhodium, molybdenum, iridium, calcium, lanthanum, strontium, barium, and cadmium, the weight percent of semiconducting pyropolymeric inorganic refractory oxide material in said resistive component being in the range of from about 25% to about 90%, and said vehicle of said resistor ink upon drying providing electrical continuity between the resistive components.
Claim 3
Dependent Claim
41 words
The electrical conductor ink as set forth in claim 1 in which said mono-layer is formed on the surface of said base by passing a decomposable organic compound over the base at a temperature of from about 400° to about 800°C.
Claim 4
Dependent Claim
27 words
The electrical conductor ink as set forth in claim 1 in which said base has a surface area of from 1 to 500 square meters per gram.
Claim 5
Dependent Claim
19 words
The electrical resistor ink as set forth in claim 1 in which said transition metal oxide is rhenium oxide.
Claim 6
Dependent Claim
19 words
The electrical resistor ink as set forth in claim 1 in which said transition metal oxide is ruthenium oxide.
Claim 7
Dependent Claim
19 words
The electrical resistor ink as set forth in claim 1 in which said transition metal oxide is titanium oxide.
Claim 8
Dependent Claim
19 words
The electrical resistor ink as set forth in claim 1 in which said transition metal oxide is zirconium oxide.
Claim 9
Dependent Claim
19 words
The electrical resistor ink as set forth in claim 1 in which said vehicle is varnish and isopropyl alcohol.
Claim 10
Dependent Claim
29 words
The electrical resistor ink as set forth in claim 1 in which said vehicle is a copolymer of vinyl chloride, vinyl acetate and vinyl alcohol, and methyl isobutyl ketone.
Claim 11
Dependent Claim
21 words
The electrical resistor ink as set forth in claim 1 in which said vehicle is an alkyl resin and mineral spirits.
Claim 12
Dependent Claim
19 words
The electrical resistor ink as set forth in claim 1 in which said vehicle is shellac and isopropyl alcohol.
Claim 13
Dependent Claim
20 words
The electrical resistor ink as set forth in claim 1 in which said vehicle is ethyl cellulose and methyl alcohol.
Claim 14
Dependent Claim
20 words
A resistor formed by applying the electrical resistor ink of claim 1 upon a solid surface and drying said ink.
Claim 15
Dependent Claim
32 words
The resistor as set forth in claim 13 in which said mixture of said ink is present in an amount of from about 50% to about 90% by weight of said resistor.
Claim 16
Dependent Claim
16 words
The electrical conductor ink as set forth in claim 1 in which said base is gamma-alumina.
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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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |