Patent US2633448A successfully refreshed from Google Patents.
US2633448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double solvent extraction of oils
Assignee: Consolidation Coal Co
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Filing: 1950-09-12
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Granted: 1953-03-31
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Expires: 1970-09-12
Abstract
No abstract record available.
Inventors
- 👤 Martin B Neuworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:46
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/02; C10G21/04; C10G21/06; C10G21/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
AN EXTRACTION PROCESS FOR SEPARATING AROMATIC AND SATURATED HYDROCARBONS, CONTAINED IN A SUBSTANTIALLY TAR ACID FREE OIL BOILING BELOW 350*C., WHICH COMPRISES FEEDING SAID OIL INTO A VERTICAL COUNTERCURRENT EXTRACTION ZONE, FEEDING A SOLVENT CONSISTING OF PARAFFINIC NAPHTHA BOILING WITHIN THE RANGE 60 TO 130* C. AND HAVING A DENSITY OF LESS THAN 0.8 INTO THE BOTTOM OF SAID EXTRACTION ZONE, FEEDING A SECOND SOLVENT CONSISTING OF AN AQUEOUS METHANOL SOLUTION CONTAINING 75 TO 96 PER CENT BY WEIGHT OF METHANOL AND THE BALANCE WATER INTO THE TOP OF SAID EXTRACTION ZONE, PASSING SAID NAPHTHA THROUGH SAID EXTRACTION ZONE COUNTERCURRENTLY TO AND IN INTIMATE CONTACT WITH SAID AQUEOUS METHANOL SOLUTION, AND RECOVERING AN AQUEOUS METHANOL EXTRACT AND A NAPTHA SOLUTION FROM SAID EXTRACTION ZONE.
Claim 2
Dependent Claim
124 words
AN EXTRACTION PROCESS FOR SEPARATING AROMATIC AND SATURATED HYDROCARBONS, CONTAINED IN A SUBSTANTIALLY TAR ACID FREE OIL BOILING BELOW 350*C., WHICH COMPRISES FEEDING SAID OIL INTO A VERTICAL COUNTERCURRENT EXTRACTION ZONE, FEEDING A SOLVENT CONSISTING OF PARAFFINIC NAPHTHA BOILING WITHIN THE RANGE 60 TO 130* C. AND HAVING A DENSITY OF LESS THAN 0.8 INTO THE BOTTOM OF SAID EXTRACTION ZONE, FEEDING A SECOND SOLVENT CONSISTING OF AN AQUEOUS METHANOL SOLUTION CONTAINING 75 TO 96 PER CENT BY WEIGHT OF METHANOL AND THE BALANCE WATER INTO THE TOP OF SAID EXTRACTION ZONE, PASSING SAID NAPHTHA THROUGH SAID EXTRACTION ZONE COUNTERCURRENTLY TO AND IN INTIMATE CONTACT WITH SAID AQUEOUS METHANOL SOLUTION, AND RECOVERING AN AQUEOUS METHANOL EXTRACT AND A NAPTHA SOLUTION FROM SAID EXTRACTION ZONE.
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) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |