Patent US2764530A successfully refreshed from Google Patents.
US2764530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Producing low resistivity carbon for electrodes
Assignee: Research Corp
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Filing: 1952-10-06
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Granted: 1956-09-25
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Expires: 1972-10-06
Abstract
No abstract record available.
Inventors
- 👤 Edwin N Klemgard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:54
CPC Classifications
C; C10; C10B; C10B57/00; C10B57/04; C10B57/08; C10L; C10L9/00; C10L9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
THE PROCESS FOR MANUFACTURING ELECTRODE CARBON HAVING A SPECIFIC RESISTIVITY OF LESS THAN .0027 OHM PER INCH CUBE WHICH COMPRISES THE STEPS OF FINELY DIVIDING A COAL HAVING LESS THAN 20% ASH CONSTUTUENTS, LEACHING THE COAL WITH AN AQUEOUS SOLUTION OF MINERAL ACID, WASHING THE COAL TO REMOVE SOLUBLE SALTS, DRYING THE COAL, COMBINING THE DRIED COAL WITH PITCH IN PROPORTIONS OF ABOUT 60% COAL TO ABOUT 40% PITCH BY WEIGHT, HEATING THE MIXTURE OF COAL AND PITCH GRADUALLY TO A TEMPERATURE OF THE ORDER OF 1000 DEGREES C. TO 1200 DEGREES C. AND CALCINING THE MITURE AT SUCH TEMPERATURE IN THE PRESENCE OF AIR TO DRIVE OFF VOLATILE MATERIAL, THEN BRINGING THE PRODUCT IN THE ABSENCE OF AIR TO A TEMPERATURE ABOVE 1600 DEGREES C. AND BELOW 2000 DEGREES C.
Claim 2
Dependent Claim
131 words
THE PROCESS FOR MANUFACTURING ELECTRODE CARBON HAVING A SPECIFIC RESISTIVITY OF LESS THAN .0027 OHM PER INCH CUBE WHICH COMPRISES THE STEPS OF FINELY DIVIDING A COAL HAVING LESS THAN 20% ASH CONSTUTUENTS, LEACHING THE COAL WITH AN AQUEOUS SOLUTION OF MINERAL ACID, WASHING THE COAL TO REMOVE SOLUBLE SALTS, DRYING THE COAL, COMBINING THE DRIED COAL WITH PITCH IN PROPORTIONS OF ABOUT 60% COAL TO ABOUT 40% PITCH BY WEIGHT, HEATING THE MIXTURE OF COAL AND PITCH GRADUALLY TO A TEMPERATURE OF THE ORDER OF 1000 DEGREES C. TO 1200 DEGREES C. AND CALCINING THE MITURE AT SUCH TEMPERATURE IN THE PRESENCE OF AIR TO DRIVE OFF VOLATILE MATERIAL, THEN BRINGING THE PRODUCT IN THE ABSENCE OF AIR TO A TEMPERATURE ABOVE 1600 DEGREES C. AND BELOW 2000 DEGREES C.
References Cited (Backward Citations)
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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) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |