Patent US3876505A successfully refreshed from Google Patents.
US3876505A
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Manufacture of activated carbon from sized coal
Assignee: Calgon Carbon Corp
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Filing: 1972-12-08
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Granted: 1975-04-08
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Expires: 1992-12-08
Abstract
Abstract Activated carbon comparable to conventional granular activated carbon is manufactured without the steps of pulverizing, mixing, briquetting, and carbonizing. The carbon is made from dried, subbituminous coal by sizing, simultaneously drying and oxidizing, and thereafter activating the sized coal.
Inventors
- 👤 George Robert Stoneburner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:42
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/336
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
116 words
METHOD OF MAKING GRANULAR ACTIVATED CARBON COMPRISING A. CRUSHING AND SEPARATING TO A SIZE IN THE RANGE OF 2X40 U.S. SIEVE, A COAL HAVING AN ASTM RANK OF HIGH VOLATILE C BITUMINOUS OR LOWER AND HAVING GREATER THAN 10 PERCENT BY WEIGHT BED MOISTURE AND GREATER THAN 10 PERCENT BY WEIGHT OXYGEN CONTENT; B. HEATING SAID CRUSHED AND SEPARATED COAL IN AIR AT A TEMPERATURE OF ABOUT 150*C TO ABOUT 215*C. FOR A PERIOD OF FROM 30 MINUTES TO 18 HOURS, WHEREBY ABOUT 1 PERCENT TO ABOUT 3 PERCENT BY WEIGHT OXYGEN IS ADDD TO THE COAL; AND C. ACTIVATING THE THUS OXIDIZED COAL AT A TEMPERATURE BETWEEN 1,000*F. AND 2,000*F. IN A CONTROLLED OXYGEN ATMOSPHERE.
Claim 2
Dependent Claim
116 words
METHOD OF MAKING GRANULAR ACTIVATED CARBON COMPRISING A. CRUSHING AND SEPARATING TO A SIZE IN THE RANGE OF 2X40 U.S. SIEVE, A COAL HAVING AN ASTM RANK OF HIGH VOLATILE C BITUMINOUS OR LOWER AND HAVING GREATER THAN 10 PERCENT BY WEIGHT BED MOISTURE AND GREATER THAN 10 PERCENT BY WEIGHT OXYGEN CONTENT; B. HEATING SAID CRUSHED AND SEPARATED COAL IN AIR AT A TEMPERATURE OF ABOUT 150*C TO ABOUT 215*C. FOR A PERIOD OF FROM 30 MINUTES TO 18 HOURS, WHEREBY ABOUT 1 PERCENT TO ABOUT 3 PERCENT BY WEIGHT OXYGEN IS ADDD TO THE COAL; AND C. ACTIVATING THE THUS OXIDIZED COAL AT A TEMPERATURE BETWEEN 1,000*F. AND 2,000*F. IN A CONTROLLED OXYGEN ATMOSPHERE.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein in step (b) thereof the air is oxygen-enriched.
References Cited (Backward Citations)
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US2339742A
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US2407268A
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US3070515A
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US3565827A
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |