US2998375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode of carbon material from bituminous coal and method of making the same
Assignee: Kaiser Aluminum and Chemical Corp
•
Filing: 1953-01-06
•
Granted: 1961-08-29
•
Expires: 1973-01-06
Abstract
No abstract record available.
Inventors
- 👤 Warren S Peterson
- 👤 Donald H Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:22
CPC Classifications
C; C25; C25C; C25C7/00; C25C7/02; C25C7/025; Y; Y10; Y10S; Y10S264/00; Y10S264/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A METHOD OF PRODUCING ELECTRODE CARBON MATERIAL FROM BITUMINOUS COAL, WHICH COMPRISES DE-ASHING A BITUMINOUS COKING SAID COAL TO A TEMPERATURE IN 2.5% BY WEIGHT, COKING SAID COAL TO A TEMPERATURE IN EXCESS OF 700*C. WITH A RATE OF TEMPERATURE RISE THROUGH THE PLASTIC ZONE OF NOT LESS THAN ABOUT 100*C. PER HOUR TO OBTAIN A DENSE COKE IN THE FORM OF A STRONG SWOLLEN CAKE, CALCINING SAID COAL COKE AT A TEMPERATURE OF FROM 1200 TO 1500*C. TO OBTAIN A CALCINED COKE HAVING A SPECIFIC RESISTIVITY OF NOT GREATER THAN ABOUT 0.0025 OHM/ IN./IN.2, A REAL DENSITY OF AT LEAST ABOUT 1.90 G./CC., AND A HARDNESS INDEX OF NOT LESS THAN 35, CRUSHING AND MILLING SAID COKE AND GRADING THE COKE PARTICLES TO PROVIDE AN AGGREGATE OF SUITABLE SIZE CONSIST FOR PRODUCTION OF ELECTRODES.
Claim 2
Independent Claim
135 words
A METHOD OF PRODUCING ELECTRODE CARBON MATERIAL FROM BITUMINOUS COAL, WHICH COMPRISES DE-ASHING A BITUMINOUS COKING SAID COAL TO A TEMPERATURE IN 2.5% BY WEIGHT, COKING SAID COAL TO A TEMPERATURE IN EXCESS OF 700*C. WITH A RATE OF TEMPERATURE RISE THROUGH THE PLASTIC ZONE OF NOT LESS THAN ABOUT 100*C. PER HOUR TO OBTAIN A DENSE COKE IN THE FORM OF A STRONG SWOLLEN CAKE, CALCINING SAID COAL COKE AT A TEMPERATURE OF FROM 1200 TO 1500*C. TO OBTAIN A CALCINED COKE HAVING A SPECIFIC RESISTIVITY OF NOT GREATER THAN ABOUT 0.0025 OHM/ IN./IN.2, A REAL DENSITY OF AT LEAST ABOUT 1.90 G./CC., AND A HARDNESS INDEX OF NOT LESS THAN 35, CRUSHING AND MILLING SAID COKE AND GRADING THE COKE PARTICLES TO PROVIDE AN AGGREGATE OF SUITABLE SIZE CONSIST FOR PRODUCTION OF ELECTRODES.
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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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |