Patent JPS6024906A successfully refreshed from Google Patents.
Patent US2655468A successfully refreshed from Google Patents.
US2655468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovering solvent from process steam
Assignee: Standard Oil Development Co
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Filing: 1951-03-10
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Granted: 1953-10-13
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Expires: 1971-03-10
Abstract
No abstract record available.
Inventors
- 👤 Robert L Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:51
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN THE EXTRACTION OF LUBRICATING OIL STOCKS BY MEANS OF TWO IMMISCIBLE SOLVENTS, A FIRST SOLVENT FOR THE PARAFFINIC CONSTITUENTS AND A SECOND SOLVENT FOR THE NAPHTHENIC CONSTITUENTS WHEREIN SAID FIRST SOLVENT IS REMOVED FROM THE RAFFINATE AND EXTRACT FRACTIONS BY DISTILLATION AND SAID SECOND SOLVENT IS THEN REMOVED FROM THE RAFFINATE AND EXTRACT FRACTIONS BY STRIPPING THEM WITH STEAM, WHEREIN THE STREAM OF STEAM AND SAID SECOND SOLVENT FROM THE STRIPPING OPERATION ARE FRACTIONATED TO FORM A FIRST OVERHEAD AZEOTROPIC FRACTION COMPRISING STEAM AND SAID SECOND SOLVENT, THE IMPROVEMENT WHICH COMPRISES IN COMBINATION CONDENSING SAID FIRST OVERHEAD AZEOTROPIC FRACTION, CONTACTING THE RESULTING CONDENSATE WITH SAID FIRST SOLVENT WHEREBY A PORTION OF SAID SECOND SOLVENT IS EXTRACTED FROM SAID CONDENSED FIRST AZEOTROPIC FRACTION, FRACTIONATING THE RESULTING RAFFINATE TO FORM A SECOND OVERHEAT AZEOTROPIC FRACTION COMPRISING STEAM AND SAID SECOND SOLVENT AND A BOTTOMS FRACTION COMPRISING SUBSTANTIALLY PURE WATER AND RECYCLING SAID SECOND OVERHEAD AZEOTROPIC FRACTION BY BLENDING IT WITH SAID FIRST OVERHEAD AZEOTROPIC FRACTION.
Claim 2
Dependent Claim
164 words
IN THE EXTRACTION OF LUBRICATING OIL STOCKS BY MEANS OF TWO IMMISCIBLE SOLVENTS, A FIRST SOLVENT FOR THE PARAFFINIC CONSTITUENTS AND A SECOND SOLVENT FOR THE NAPHTHENIC CONSTITUENTS WHEREIN SAID FIRST SOLVENT IS REMOVED FROM THE RAFFINATE AND EXTRACT FRACTIONS BY DISTILLATION AND SAID SECOND SOLVENT IS THEN REMOVED FROM THE RAFFINATE AND EXTRACT FRACTIONS BY STRIPPING THEM WITH STEAM, WHEREIN THE STREAM OF STEAM AND SAID SECOND SOLVENT FROM THE STRIPPING OPERATION ARE FRACTIONATED TO FORM A FIRST OVERHEAD AZEOTROPIC FRACTION COMPRISING STEAM AND SAID SECOND SOLVENT, THE IMPROVEMENT WHICH COMPRISES IN COMBINATION CONDENSING SAID FIRST OVERHEAD AZEOTROPIC FRACTION, CONTACTING THE RESULTING CONDENSATE WITH SAID FIRST SOLVENT WHEREBY A PORTION OF SAID SECOND SOLVENT IS EXTRACTED FROM SAID CONDENSED FIRST AZEOTROPIC FRACTION, FRACTIONATING THE RESULTING RAFFINATE TO FORM A SECOND OVERHEAT AZEOTROPIC FRACTION COMPRISING STEAM AND SAID SECOND SOLVENT AND A BOTTOMS FRACTION COMPRISING SUBSTANTIALLY PURE WATER AND RECYCLING SAID SECOND OVERHEAD AZEOTROPIC FRACTION BY BLENDING IT WITH SAID FIRST OVERHEAD AZEOTROPIC FRACTION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |