US3825489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction process
Assignee: Sunoco Inc
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Filing: 1972-11-21
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Granted: 1974-07-23
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Expires: 1992-11-21
Abstract
Abstract A SOLVENT EXTRACTION PROCESS, MORE PARTICULARLY A FURFURAL EXTRACTION PROCESS WHEREIN A PORTION OF THE EXTRACT PHASE IS WITHDRAWN FROM THE EXTRACTION ZONE, CONCENTRATED AND COOLED BY EVAPORATION OF PART OF THE SOLVENT CONTAINED THEREIN AND BY COOLING MENS AND RETURNED TO THE EXTRACTION VESSEL, THEREBY ENHANCING THE AROMATICPARAFFINIC SEPARATION TAKING PLACE THEREIN. D R A W I N G
Inventors
- 👤 I Steinmetz
- 👤 W Wentzheimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:43
CPC Classifications
C; C10; C10G; 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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |