Patent US2466495A successfully refreshed from Google Patents.
Patent US3702295A successfully refreshed from Google Patents.
US3702295A
Expired / Lapsed
US
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Aromatic hydrocarbon recovery method
Assignee: Universal Oil Products Co
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Filing: 1971-05-27
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Granted: 1972-11-07
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Expires: 1991-05-27
Abstract
Abstract HIGH PURITY AROMATIC HYDROCARBONS ARE EXTRACTED FROM A MIXTURE OF AROMATIC AND NON-AROMATIC HYDROCARBONS BY A COMBINATION OF SOLVENT EXTRACTION, STRIPPING OF THE AROMATIC EXTRACT AND THE RECTIFICATION OF A VAPOR SIDE CUT FROM THE AROMATIC STRIPPING IN THE PRESENCE OF A WATER REFLUX.
Inventors
- 👤 Herbert Lytle Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:24
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |