US2673174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent refining process
Assignee: Pure Oil Co
•
Filing: 1951-05-23
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Granted: 1954-03-23
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Expires: 1971-05-23
Abstract
No abstract record available.
Inventors
- 👤 Edward P King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:04
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A SOLVENT REFINING PROCESS FOR IMPROVING THE VISCOSITY INDEX OF A MATERIAL OIL LUBRICANT WHEREIN A PETROLEUM OIL CONTACTED WITH A PHENOL SOLVENT TO PRODUCE AN OIL-RICH PHASE AND A SOLVENT-RICH PHASE, THE IMPROVEMENT COMPRISING MAINTAINING WITHIN THE CONTACTING ZONE A MATERIAL SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND AMMONIACAL COMPOUNDS WHICH DECOMPOSE TO LIBERATE AMMONIA UNDER TE CONDITIONS OF OPERATION OF SAID PROCESS, SAID MATERIAL BEING PRESENTS IN SMALL PROCESS, SAID MATERIAL LENT OF ABOUT 0.05 CENT BY WEIGHT OF AMMONIA CONTACTING ZONE, BUT SUFFICIENT TO ENHANCE PHASE SEPARATION BETWEEN THE OIL-RICH AND THE SOLVENTRICH PHASES.
Claim 2
Dependent Claim
99 words
IN A SOLVENT REFINING PROCESS FOR IMPROVING THE VISCOSITY INDEX OF A MATERIAL OIL LUBRICANT WHEREIN A PETROLEUM OIL CONTACTED WITH A PHENOL SOLVENT TO PRODUCE AN OIL-RICH PHASE AND A SOLVENT-RICH PHASE, THE IMPROVEMENT COMPRISING MAINTAINING WITHIN THE CONTACTING ZONE A MATERIAL SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND AMMONIACAL COMPOUNDS WHICH DECOMPOSE TO LIBERATE AMMONIA UNDER TE CONDITIONS OF OPERATION OF SAID PROCESS, SAID MATERIAL BEING PRESENTS IN SMALL PROCESS, SAID MATERIAL LENT OF ABOUT 0.05 CENT BY WEIGHT OF AMMONIA CONTACTING ZONE, BUT SUFFICIENT TO ENHANCE PHASE SEPARATION BETWEEN THE OIL-RICH AND THE SOLVENTRICH PHASES.
References Cited (Backward Citations)
US2092199A
Cited
US2128029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |