Patent US1000633A successfully refreshed from Google Patents.
Patent US3682815A successfully refreshed from Google Patents.
US3682815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duo-sol process with split feed of polar solvent
Assignee: Union Oil Company of California
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Filing: 1970-07-27
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Granted: 1972-08-08
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Expires: 1990-07-27
Abstract
Abstract A DUO-SOL PROCESS WHEREIN A RESIDUUM IS SUBJECTED TO A COUNTERCURRENT LIQUID-LIQUID EXTRACTION PROCESS UTILIZING A PARAFFINIC SOLVENT TO EXTRACT PARAFFINS AND A POLAR SOLVENT TO EXTRACT AROMATICS, NAPHTHENES AND ASPHALTENES IS IMPROVED BY INTRODUCING 5-50 PERCENT OF THE POLAR SOLVENT INTO THE RESIDUM FEED STAGE. IN ANOTHER EMOBDIMENT, 1-5 PERCENT OF THE POLAR SOLVENT IS INTRODUCED INTO THE PARAFFINIC SOLVENT FEED STAGE. THE INVENTION IS PARTICULARLY USEFUL WHEREIN THE RESIDUUM CONTAINS A RELATIVELY HIGH AMOUNT OF ASPHALTENES.
Inventors
- 👤 Raymond N Fleck
- 👤 Louis M Dvoracek
- 👤 Paul F Lueth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:34
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/003; C10G21/02; C10G21/04
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |