Patent US2516233A successfully refreshed from Google Patents.
US2516233A
Expired / Lapsed
US
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Alternate oxidation and reduction of carbon
Assignee: Union Oil Company of California
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Filing: 1947-02-17
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Granted: 1950-07-25
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Expires: 1967-02-17
Abstract
No abstract record available.
Inventors
- 👤 Art C Mckinnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:19
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/342; C01P; C01P2006/00; C01P2006/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A METHOD FOR THE IMPROVEMENT OF ACTIVATED CARBON BY INCREASING ADSORPTIVE SELECTIVITY AND THE ADSORPTIVE CAPACITY THEREOF WHICH COMPRISES SUBJECTING SAID ACTIVATED CARBON TO A PLURALITY OF OXIDIZING TREATMENTS WITH NITRIC ACID HAVING A CONCENTRATION OF FROM ABOUT 70 WEIGHT PER CENT, SAID OXIDIZING TREATMENT BEING PERFORMED AT A TEMPERATURE OF ABOUT 120*C. FOR A PERIOD OF FROM ABOUT 0.5 TO 5 MINUTES, SAID OXIDIZING TREATMENTS ALSO BEING PERFORMED IN ALTERNATION WITH A PLURALITY OF REDUCING TREATMENTS WITH A GAS CONTAINING STEAM, SAID REDUCING TREATMENTS BEING PERFORMED AT A TEMPERATURE OF ABOUT 850*C. FOR A PERIOD BETWEEN ABOUT 2 AND 15 MINUTES.
Claim 2
Independent Claim
102 words
A METHOD FOR THE IMPROVEMENT OF ACTIVATED CARBON BY INCREASING ADSORPTIVE SELECTIVITY AND THE ADSORPTIVE CAPACITY THEREOF WHICH COMPRISES SUBJECTING SAID ACTIVATED CARBON TO A PLURALITY OF OXIDIZING TREATMENTS WITH NITRIC ACID HAVING A CONCENTRATION OF FROM ABOUT 70 WEIGHT PER CENT, SAID OXIDIZING TREATMENT BEING PERFORMED AT A TEMPERATURE OF ABOUT 120*C. FOR A PERIOD OF FROM ABOUT 0.5 TO 5 MINUTES, SAID OXIDIZING TREATMENTS ALSO BEING PERFORMED IN ALTERNATION WITH A PLURALITY OF REDUCING TREATMENTS WITH A GAS CONTAINING STEAM, SAID REDUCING TREATMENTS BEING PERFORMED AT A TEMPERATURE OF ABOUT 850*C. FOR A PERIOD BETWEEN ABOUT 2 AND 15 MINUTES.
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) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |