US3723256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic hydrocarbon recovery by extractive distillation, extraction and plural distillations
Assignee: Universal Oil Products Co
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Filing: 1971-06-14
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Granted: 1973-03-27
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Expires: 1991-06-14
Abstract
Abstract AROMATIC HYDROCARBONS ARE SEPARATED FROM A MIXTURE OF AROMATICS AND NON-AROMATICS, SUCH AS A C6-C8 ANPHTHA FRACTION, BY A COMBINATION OF PRELIMINARY FRACTIONATION, EXTRACTIVE DISTILLATION OF THE FRACTIONATION OVERHEAD, AND SOLVENT EXGTRACTION OF THE FRACTIONATION BOTTOMS. D R A W I N G
Inventors
- 👤 H Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:22
CPC Classifications
C; C10; C10G; C10G7/00; C10G7/08; C10G21/00
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |