US2737469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of solvent extraction
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1953-04-13
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Granted: 1956-03-06
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Expires: 1973-04-13
Abstract
No abstract record available.
Inventors
- 👤 Jr James A Anderson
- 👤 Benjamin W Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:28
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/30; Y; Y10; Y10S; Y10S208/00; Y10S208/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD FOR CONTROLLING THE SOLVENT EXTRACTION OF A LUBRICATING OIL FRACTION TO OBTAIN PRECISE SEPARATION OF LOW VISCOSITY INDEX FRACTIONS FROM HIGH VISCOSITY INDEX FRACTIONS IN WHICH A SELECTED AMOUNT OF SAID FRACTION IS CHARGED INTO A SOLVENT EXTRACTION SYSTEM AND CONTACTED UNDER EXTRACTION CONDITIONS INCLUDING A TEMPERATURE IN THE RANGE FROM 175* TO 200* F. WITH A SUFFICIENT AMOUNT OF A SELECTIVE SOLVENT TO FORM A RAFFINATE PHASE AND AN EXTRACT PHASE AND IN WHICH SOLVENT IS REMOVED FROM SAID
Claim 2
Independent Claim
82 words
A METHOD FOR CONTROLLING THE SOLVENT EXTRACTION OF A LUBRICATING OIL FRACTION TO OBTAIN PRECISE SEPARATION OF LOW VISCOSITY INDEX FRACTIONS FROM HIGH VISCOSITY INDEX FRACTIONS IN WHICH A SELECTED AMOUNT OF SAID FRACTION IS CHARGED INTO A SOLVENT EXTRACTION SYSTEM AND CONTACTED UNDER EXTRACTION CONDITIONS INCLUDING A TEMPERATURE IN THE RANGE FROM 175* TO 200* F. WITH A SUFFICIENT AMOUNT OF A SELECTIVE SOLVENT TO FORM A RAFFINATE PHASE AND AN EXTRACT PHASE AND IN WHICH SOLVENT IS REMOVED FROM SAID
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |