US2544307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing oil from filter cakes
Assignee: Standard Oil Development Co
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Filing: 1948-11-20
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Granted: 1951-03-06
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Expires: 1968-11-20
Abstract
No abstract record available.
Inventors
- 👤 Fourrier Francis Leo
- 👤 Jr John Opryshek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:31
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/42; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN A PROCESS IN WHICH A LUBRICATING OIL FRACTION IS DILUTED WITH A NORMALLY GASEOUS LIGHT HYDROCARBON, CHILLED, DEWAXED TO FORM A FILTER CAKE AND A DEWAXED SOLUTION, THE DEWAXED SOLUTION IS SUBJECTED TO CONTACT WITH SULFURIC ACID, NORMALLY GASEOUS LIGHT HYDROCARBON IS REMOVED FROM THE ACID TREATED OIL, AND THE LIGHT HYDROCARBON IS CONTACTED WITH AN AQUEOUS SOLUTION, THE STEPS OF SEPARATING A PORTION OF SAID DEWAXED SOLUTION PRIOR TO ANY CONTENT THEREOF WITH SULFURIC ACID, DISTILLING SAID SEPARATED PORTION OF THE DEWAXED SOLUTION TO RECOVER A SUBSTANTIALLY DRY LIGHT HYDROCARBON THEREFROM, CHILLING SAID SUBSTANTIALLY DRY LIGHT HYDROCARBON, AND WASHING SAID FILTER CAKE WITH SAID CHILLED DRY LIGHT HYDROCARBON.
Claim 2
Dependent Claim
110 words
IN A PROCESS IN WHICH A LUBRICATING OIL FRACTION IS DILUTED WITH A NORMALLY GASEOUS LIGHT HYDROCARBON, CHILLED, DEWAXED TO FORM A FILTER CAKE AND A DEWAXED SOLUTION, THE DEWAXED SOLUTION IS SUBJECTED TO CONTACT WITH SULFURIC ACID, NORMALLY GASEOUS LIGHT HYDROCARBON IS REMOVED FROM THE ACID TREATED OIL, AND THE LIGHT HYDROCARBON IS CONTACTED WITH AN AQUEOUS SOLUTION, THE STEPS OF SEPARATING A PORTION OF SAID DEWAXED SOLUTION PRIOR TO ANY CONTENT THEREOF WITH SULFURIC ACID, DISTILLING SAID SEPARATED PORTION OF THE DEWAXED SOLUTION TO RECOVER A SUBSTANTIALLY DRY LIGHT HYDROCARBON THEREFROM, CHILLING SAID SUBSTANTIALLY DRY LIGHT HYDROCARBON, AND WASHING SAID FILTER CAKE WITH SAID CHILLED DRY LIGHT HYDROCARBON.
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) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |