Patent US2809938A successfully refreshed from Google Patents.
US2809938A
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Activatable chars, activated carbons, and process for preparing the same
Assignee: KERR MC GEE OIL IND Inc
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Filing: 1954-05-26
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Granted: 1957-10-15
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Expires: 1974-05-26
Abstract
No abstract record available.
Inventors
- 👤 Mayer B Goren
- 👤 Ira D Elkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:50
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/318; C01B32/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE PROCESS FOR MAKING AN ACTIVATABLE CHAR FROM AN ASPHALT WHICH COMPRISES THE STEPS OF HEATING ASPHALT IN PARTICULATE FORM WITHIN THE TEMPERATURE RANGE 60150*C. AND IN THE PRESENCE OF 1/2 TO 9 PARTS BY WEIGHT OF CONCENTRATED SULFURIC ACID FOR EACH PART BY WEIGHT OF ASPHALT THEREBY SULFONATING AND OBTAINING A PRODUCT READILY WET BY WATER, DISTILLING OFF SULFUR DIOXIDE BY GRADUALLLY INCREASING THE TEMPERATURES OF THE REACTION MIXTURE, HEATING TO DRYNESS AT A TEMPERATURE BETWEEN 300 AND 450*C., AND SUBSEQUENTLY CHARRING THE PRODUCT AT ELEVATED TEMPERATURE IN THE ABSENCE OF OXYGEN.
Claim 2
Dependent Claim
93 words
THE PROCESS FOR MAKING AN ACTIVATABLE CHAR FROM AN ASPHALT WHICH COMPRISES THE STEPS OF HEATING ASPHALT IN PARTICULATE FORM WITHIN THE TEMPERATURE RANGE 60150*C. AND IN THE PRESENCE OF 1/2 TO 9 PARTS BY WEIGHT OF CONCENTRATED SULFURIC ACID FOR EACH PART BY WEIGHT OF ASPHALT THEREBY SULFONATING AND OBTAINING A PRODUCT READILY WET BY WATER, DISTILLING OFF SULFUR DIOXIDE BY GRADUALLLY INCREASING THE TEMPERATURES OF THE REACTION MIXTURE, HEATING TO DRYNESS AT A TEMPERATURE BETWEEN 300 AND 450*C., AND SUBSEQUENTLY CHARRING THE PRODUCT AT ELEVATED TEMPERATURE IN THE ABSENCE OF OXYGEN.
References Cited (Backward Citations)
US2201050A
Cited
US2585454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |