Patent US2556859A successfully refreshed from Google Patents.
US2556859A
Expired / Lapsed
US
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Process of further activating activated carbon
Assignee: Standard Oil Development Co
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Filing: 1949-06-23
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Granted: 1951-06-12
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Expires: 1969-06-23
Abstract
No abstract record available.
Inventors
- 👤 Hans G Vesterdal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:30
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/336
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
PROCESS FOR THE PREPARATION OF AN ACTIVATED CARBON ADAPTABLE FOR THE ADSORPTIVE SEPARATION OF NORMAL PARAFFIN HYDROCARBONS FROM ISO-PARAFFIN HYDROCARBONS WHICH COMPRISES, COKING CARBONACEOUS MATERIAL AT A TEMPERATURE OF 7001200* F. TO PRODUCE A CARBON, ACTIVATING SAID CARBON BY TREATMENT WITH STEAM AT A TEMPERATURE OF 1200-1600* F. AND THEREAFTER FURTHER ACTIVATING SAID ACTIVATED CARBON BY HEATING THE SAME IN AN INERT ATMOSPHERE SUBSTANTIALLY COMPLETELY FREE OF OXGEN AT A TEMPERATURE OF 1800-2700* F. FOR A PERIOD OF AT LEAST TWO HOURS.
Claim 2
Dependent Claim
82 words
PROCESS FOR THE PREPARATION OF AN ACTIVATED CARBON ADAPTABLE FOR THE ADSORPTIVE SEPARATION OF NORMAL PARAFFIN HYDROCARBONS FROM ISO-PARAFFIN HYDROCARBONS WHICH COMPRISES, COKING CARBONACEOUS MATERIAL AT A TEMPERATURE OF 7001200* F. TO PRODUCE A CARBON, ACTIVATING SAID CARBON BY TREATMENT WITH STEAM AT A TEMPERATURE OF 1200-1600* F. AND THEREAFTER FURTHER ACTIVATING SAID ACTIVATED CARBON BY HEATING THE SAME IN AN INERT ATMOSPHERE SUBSTANTIALLY COMPLETELY FREE OF OXGEN AT A TEMPERATURE OF 1800-2700* F. FOR A PERIOD OF AT LEAST TWO HOURS.
References Cited (Backward Citations)
US1774341A
Cited
US1780154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |