Patent US2922808A successfully refreshed from Google Patents.
US2922808A
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US
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Solvent extraction process
Assignee: Standard Oil Co
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Filing: 1957-12-23
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Granted: 1960-01-26
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Expires: 1977-12-23
Abstract
No abstract record available.
Inventors
- 👤 Paul N Rylander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:15
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0492; C; C07; C07C; C07C45/00; C07C45/49; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A METHOD FOR REFINING A MIXTURE COMPRISING NORMALLY LIQUID HYDROCARBONS AND OIL-SOLUBLE WATER-IMMISCIBLE ALCHOLS, WHICH PROCESS COMPRISES SELECTIVELY EXTRACTING SAID MIXTURE WITH LIQUID 2-PYRROLIDONE, AND SEPARATING A LIQUID EXTRACT PHASE.
Claim 2
Independent Claim
30 words
A METHOD FOR REFINING A MIXTURE COMPRISING NORMALLY LIQUID HYDROCARBONS AND OIL-SOLUBLE WATER-IMMISCIBLE ALCHOLS, WHICH PROCESS COMPRISES SELECTIVELY EXTRACTING SAID MIXTURE WITH LIQUID 2-PYRROLIDONE, AND SEPARATING A LIQUID EXTRACT PHASE.
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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) | 1963-01-25 | 1963-07-27 | 1964-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-25 | 1967-07-27 | 1968-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-25 | 1971-07-27 | 1972-01-26 | $7700.00 | Window Closed / Lapsed |