US2667447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ketone dewaxing process
Assignee: Standard Oil Development Co
•
Filing: 1950-07-03
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Granted: 1954-01-26
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Expires: 1970-07-03
Abstract
No abstract record available.
Inventors
- 👤 Stephen F Perry
- 👤 George W Engisch
- 👤 Richard A Marriner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:54
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A PROCESS FOR DEWAXING A WAXY PETROLEUM DISTILLATE, A SUBSTANTIAL PORTION OF WHICH BOILS IN THE RANGE OF 850* F. TO 950* F. AT ATMOSPHERIC PRESSURE, AND CHARACTERIZED BY INCLUSION OF BOTH PARAFFIN AND MICROCRYSTALLINE TYPE WAXES, COMPRISING THE STEPS OF ADDING TO SAID DISTILLATE A SOLVENT COMPRISING PRINCIPALLY A KETONE HAVING FROM 3 TO 6 CARABON ATOMS, AND HEATING SAID MIXTURE OF SOLVENT AND DISTILLATE TO A TEMPERATURE SUFFICIENT TO DISSOLVE WAX PRESENT IN THE DISTILLATE, AND THEREAFTER COOLING SAID MIXTURE OF SOLVENT AND DISTILLATE AT A RATE OF 2* TO 5* F. PER MINUTE BY HEAT EXCHANGE THROUGH CHILLING SURFACES, WHILE MAINTAINING SUFFICIENT AGITATION DURING CHILLING AN WAX CRYSTALLIZATION TO MAINTAIN A TURBULENT, UNIFORMLY MIXED SLURRY OF CRYSTALLIZED WAX, SOLVENT, AND DISTILLATE CHARACTERIZED BY THE ABSENCE OF CRYSTALLIZED WAX ON THE SAID CHILLING SURFACES.
Claim 2
Dependent Claim
136 words
A PROCESS FOR DEWAXING A WAXY PETROLEUM DISTILLATE, A SUBSTANTIAL PORTION OF WHICH BOILS IN THE RANGE OF 850* F. TO 950* F. AT ATMOSPHERIC PRESSURE, AND CHARACTERIZED BY INCLUSION OF BOTH PARAFFIN AND MICROCRYSTALLINE TYPE WAXES, COMPRISING THE STEPS OF ADDING TO SAID DISTILLATE A SOLVENT COMPRISING PRINCIPALLY A KETONE HAVING FROM 3 TO 6 CARABON ATOMS, AND HEATING SAID MIXTURE OF SOLVENT AND DISTILLATE TO A TEMPERATURE SUFFICIENT TO DISSOLVE WAX PRESENT IN THE DISTILLATE, AND THEREAFTER COOLING SAID MIXTURE OF SOLVENT AND DISTILLATE AT A RATE OF 2* TO 5* F. PER MINUTE BY HEAT EXCHANGE THROUGH CHILLING SURFACES, WHILE MAINTAINING SUFFICIENT AGITATION DURING CHILLING AN WAX CRYSTALLIZATION TO MAINTAIN A TURBULENT, UNIFORMLY MIXED SLURRY OF CRYSTALLIZED WAX, SOLVENT, AND DISTILLATE CHARACTERIZED BY THE ABSENCE OF CRYSTALLIZED WAX ON THE SAID CHILLING SURFACES.
References Cited (Backward Citations)
US2229658A
Cited
US2319381A
Cited
US2397868A
Cited
US2410483A
Cited
US2478863A
Cited
US2578192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |