US2779709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction process
Assignee: Phillips Petroleum Co
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Filing: 1952-12-31
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Granted: 1957-01-29
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Expires: 1972-12-31
Abstract
No abstract record available.
Inventors
- 👤 Glenn H Dale
- 👤 Russell O Shelton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:41
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/08; C10G21/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN A SULFUR DIOXIDE SOLVENT EXTRACTION PROCESS IN WHICH A PRIMARY EXTRACT PHASE FORMED IS CONTACTED WITH A PARAFFINIC STRIPPING OIL WHICH IS SUBSTANTIALLY FREE OF SULFUR DIOXIDE TO PRODUCE A FINAL EXTRACT PRODUCT, THE IMPROVEMENT WHICH COMPRISES REMOVING SULFUR DIOXIDE FROM SAID PRIMARY EXTRACT PHASE IN AN AMOUNT TO FORM A RESIDUAL PRIMARY EXTRACT PHASE WHICH IS LES THAN COMPLETELY MISCIBLE WITH SAID STRIPPING OIL, AND THEN COMTACTING WITH SAID STRIPPING OIL SAID RESIDUAL PRIMARY EXTRACT PHASE, IN THE CONDITION IN WHICH IT IS OBTAINED AND WHILE MAINTAINING IT IN ITS SAID LESS THAN COMPLETE MISCIBILITY CONDITION WITH SAID STRIPPING OIL, STRIPPING SAID PRIMARY EXTRACT PHASE WITH SAID STRIPPING OIL WHILE IT IS MAINTAININED IN ITS SAID CONDITION, AND SEPARATING A PHASE CONTAINING SAID STRIPPING OIL AND A STRIPPED EXTRACT PHASE EACH FROM THE OTHER.
Claim 2
Dependent Claim
136 words
IN A SULFUR DIOXIDE SOLVENT EXTRACTION PROCESS IN WHICH A PRIMARY EXTRACT PHASE FORMED IS CONTACTED WITH A PARAFFINIC STRIPPING OIL WHICH IS SUBSTANTIALLY FREE OF SULFUR DIOXIDE TO PRODUCE A FINAL EXTRACT PRODUCT, THE IMPROVEMENT WHICH COMPRISES REMOVING SULFUR DIOXIDE FROM SAID PRIMARY EXTRACT PHASE IN AN AMOUNT TO FORM A RESIDUAL PRIMARY EXTRACT PHASE WHICH IS LES THAN COMPLETELY MISCIBLE WITH SAID STRIPPING OIL, AND THEN COMTACTING WITH SAID STRIPPING OIL SAID RESIDUAL PRIMARY EXTRACT PHASE, IN THE CONDITION IN WHICH IT IS OBTAINED AND WHILE MAINTAINING IT IN ITS SAID LESS THAN COMPLETE MISCIBILITY CONDITION WITH SAID STRIPPING OIL, STRIPPING SAID PRIMARY EXTRACT PHASE WITH SAID STRIPPING OIL WHILE IT IS MAINTAININED IN ITS SAID CONDITION, AND SEPARATING A PHASE CONTAINING SAID STRIPPING OIL AND A STRIPPED EXTRACT PHASE EACH FROM THE OTHER.
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) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |