Patent US4018943A successfully refreshed from Google Patents.
US4018943A
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Method of forming a conducting material for a conducting device
Assignee: Universal Oil Products Co
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Filing: 1972-02-14
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Granted: 1977-04-19
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Expires: 1992-02-14
Abstract
Abstract A method of making conductive material for a conducting device. The material is formed by reacting an organic pyrolyzable substance in the presence of a refractory oxide having a surface area of from about 1 to about 500 square meters per gram in a non-oxidizing atmosphere at a temperature of at least 400° C.
Inventors
- 👤 Karl J. Youtsey
- 👤 William C. Holt, Jr.
- 👤 Robert D. Carnahan
- 👤 David H. Spielberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:08
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141; C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5001; H01; H01B; H01B1/00; H01C; H01C17/00; H01C17/06; H01C17/20; H01M; H01M4/00; H01M4/86; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
127 words
A method of making a conductive composition for use in a conducting device and comprising carbonaceous pyropolymer on a refractory oxide which comprises, contacting a pyrolyzable hydrocarbon, in the vapor phase and in a nonoxidizing atmosphere, with a refractory oxide selected from the group consisting of alumina and silica-alumina and having a surface area of from about 1 to about 500 square meters per gram, at a temperature of at least 400° C and for a time sufficient to form at least a monolayer of carbonaceous pyropolymer on said refractory oxide, said temperature and time of contacting being correlated to result in said conductive composition having a conductivity of at least about 10.sup. -8 inverse ohm-centimeters and within the semiconducting range, and recovering the resulting conductive composition.
Claim 2
Independent Claim
127 words
A method of making a conductive composition for use in a conducting device and comprising carbonaceous pyropolymer on a refractory oxide which comprises, contacting a pyrolyzable hydrocarbon, in the vapor phase and in a nonoxidizing atmosphere, with a refractory oxide selected from the group consisting of alumina and silica-alumina and having a surface area of from about 1 to about 500 square meters per gram, at a temperature of at least 400° C and for a time sufficient to form at least a monolayer of carbonaceous pyropolymer on said refractory oxide, said temperature and time of contacting being correlated to result in said conductive composition having a conductivity of at least about 10.sup. -8 inverse ohm-centimeters and within the semiconducting range, and recovering the resulting conductive composition.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said pyrolyzable hydrocarbon is an aliphatic hydrocarbon.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein said aliphatic hydrocarbon is an alkane.
Claim 5
Dependent Claim
10 words
The method of claim 3 wherein said alkane is hexane.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein said pyrolyzable hydrocarbon is an aromatic hydrocarbon.
Claim 7
Dependent Claim
21 words
The method of claim 5 wherein said aromatic hydrocarbon is selected from the group consisting of benzene, toluene, naphthalene and anthracene.
Claim 8
Dependent Claim
13 words
The method of claim 1 wherein said pyrolyzable hydrocarbon is an alicyclic hydrocarbon.
Claim 9
Dependent Claim
13 words
The method of claim 7 wherein said alicyclic hydrocarbon is cyclohexane or cyclohexene.
Claim 10
Dependent Claim
18 words
The method of claim 1 wherein said temperature is in the range of 600° C to 700° C.
Claim 11
Dependent Claim
11 words
The method of claim 1 wherein said refractory oxide is alumina.
Claim 12
Dependent Claim
11 words
The method of claim 1 wherein said refractory oxide is silica-alumina.
Claim 13
Dependent Claim
11 words
The method of claim 1 wherein said refractory oxide is gamma-alumina.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |