US3369871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of metallurgical carbon
Assignee: Cabot Corp
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Filing: 1965-07-15
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Granted: 1968-02-20
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Expires: 1985-07-15
Abstract
No abstract record available.
Inventors
- 👤 John F Hardy
- 👤 Porter F Gridley
- 👤 Rivin Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:35
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/08; C01; C01B; C01B32/00; C10L9/02; C10L9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A PROCESS FOR MAKING A CARBON PRODUCT FROM PETROLEUM COKE WHICH PRODUCT IS USEUFL IN METALLURGICAL APPLICATIONS, SAID PROCESS COMPRISING THE STEPS OF (1) HEATING SAID COKE AT A TEMPERATURE OF OVER ABOUT 300*F. WHILE FLOWING AN OXYGEN-CONTAINING GAS THEREOVER THEREBY REDUCING THE SULFUR CONTENT OF SAID COKE, (2) SUBJECTING THE COKE SO TREATED TO A TEMPERATURE OF AT LEAST 1600* C. THEREBY PARTIALLY GRAPHITIZING SAID COKE. (3) COOLING SAID COKE TO ABOUT 1000*F., AND (4) SUBJECTING SAID COKE TO OXIDIZING GASES AT A TEMPERATURE BETWEEN ABOUT 600* F. AND 900*F. UNTIL THE SULFUR CONTENT OF SAID PARTIALLY GRAPHITIZED COKE IS REDUCED BELOW 0.2%.
Claim 2
Dependent Claim
104 words
A PROCESS FOR MAKING A CARBON PRODUCT FROM PETROLEUM COKE WHICH PRODUCT IS USEUFL IN METALLURGICAL APPLICATIONS, SAID PROCESS COMPRISING THE STEPS OF (1) HEATING SAID COKE AT A TEMPERATURE OF OVER ABOUT 300*F. WHILE FLOWING AN OXYGEN-CONTAINING GAS THEREOVER THEREBY REDUCING THE SULFUR CONTENT OF SAID COKE, (2) SUBJECTING THE COKE SO TREATED TO A TEMPERATURE OF AT LEAST 1600* C. THEREBY PARTIALLY GRAPHITIZING SAID COKE. (3) COOLING SAID COKE TO ABOUT 1000*F., AND (4) SUBJECTING SAID COKE TO OXIDIZING GASES AT A TEMPERATURE BETWEEN ABOUT 600* F. AND 900*F. UNTIL THE SULFUR CONTENT OF SAID PARTIALLY GRAPHITIZED COKE IS REDUCED BELOW 0.2%.
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) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |