US2777800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of hydrocarbon oils
Assignee: Phillips Petroleum Co
•
Filing: 1954-05-10
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Granted: 1957-01-15
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Expires: 1974-05-10
Abstract
No abstract record available.
Inventors
- 👤 Norris W Mitchell
- 👤 Carl S Kelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:27
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/08; C10G21/10; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN THE OPERATION OF A SELECTIVE SOLVENT EXTACTION SYSTEM IN WHICH; AN OIL TO BE EXTRACTED AND A SELECTIVE SOLVENT ARE FED TO A SOLVENT EXTRACTION ZONE; A RAFFINATE PHASE AND AN EXTRACT PHASE ARE REMOVED FROM SAID ZONE; SOLVENT RECOVERY FROM SAID RAFFINATE PHASE AND FROM SAID EXTRACT PHASE IN CARRIED OUT BY DISTILLATION; FOULING OF THE EXTRACT PHASE PORTION OF SAID ZONE OCCURS; THE IMPROVEMENT WHICH COMPRISES: PERMITTING A PORTION OF RELA-
Claim 2
Dependent Claim
74 words
IN THE OPERATION OF A SELECTIVE SOLVENT EXTACTION SYSTEM IN WHICH; AN OIL TO BE EXTRACTED AND A SELECTIVE SOLVENT ARE FED TO A SOLVENT EXTRACTION ZONE; A RAFFINATE PHASE AND AN EXTRACT PHASE ARE REMOVED FROM SAID ZONE; SOLVENT RECOVERY FROM SAID RAFFINATE PHASE AND FROM SAID EXTRACT PHASE IN CARRIED OUT BY DISTILLATION; FOULING OF THE EXTRACT PHASE PORTION OF SAID ZONE OCCURS; THE IMPROVEMENT WHICH COMPRISES: PERMITTING A PORTION OF RELA-
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) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |