US4351056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon electrodes having a low coefficient of thermal expansion
Assignee: Standard Oil Co
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Filing: 1980-12-24
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Granted: 1982-09-21
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Expires: 2000-12-24
Abstract
Abstract This invention is directed toward an improved carbon electrode having a coefficient of thermal expansion of less than 3.5×10 -7 . Composition of the electrode includes needle coke in an amount of from about 60 to 90 weight percent and a quinoline soluble binder pitch in an amount of from about 10 to 40 weight percent, having a ring and ball softening point of from about 94° to 150° C. consisting of a highly aromatic condensation product of a distilled cycle oil extract with an extractant selected from the group consisting of furfural, phenol, B,B'-dichloro diethyl ether, nitrobenzene and sulfur dioxide.
Inventors
- 👤 Oliver A. Kiikka
- 👤 Donald R. Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:09
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/06; H05B7/08; H05B7/085
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
112 words
An improved carbon electrode having a coefficient of thermal expansion less than 3.5×10 -7 comprising: needle coke in an amount of from about 60 to 90 weight percent and having a coefficient of thermal expansion of up to about 8×10 -7 ; and a quinoline soluble binder pitch in an amount of from about 10 to 40 weight percent, prior to baking and graphitization, said binder pitch having a ring and ball softening point of from about 94° to 150° C. consisting of a highly aromatic condensation product of a distilled cycle oil extract with an extractant selected from the group consisting of furfural, phenol, B,B'-dichloro diethyl ether, nitrobenzene and sulfur dioxide.
Claim 2
Dependent Claim
112 words
An improved carbon electrode having a coefficient of thermal expansion less than 3.5×10 -7 comprising: needle coke in an amount of from about 60 to 90 weight percent and having a coefficient of thermal expansion of up to about 8×10 -7 ; and a quinoline soluble binder pitch in an amount of from about 10 to 40 weight percent, prior to baking and graphitization, said binder pitch having a ring and ball softening point of from about 94° to 150° C. consisting of a highly aromatic condensation product of a distilled cycle oil extract with an extractant selected from the group consisting of furfural, phenol, B,B'-dichloro diethyl ether, nitrobenzene and sulfur dioxide.
Claim 3
Dependent Claim
36 words
An improved carbon electrode, as set forth in claim 1, wherein the amount of needle coke is 74 weight percent and the amount of said binder pitch is 26 weight percent prior to baking and graphitization.
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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |