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US2885355A
Expired / Lapsed
US
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Refines lubricating oil with sulfur trioxide and alkali
Assignee: Sunoco Inc
•
Filing: 1953-11-24
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Granted: 1959-05-05
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Expires: 1973-11-24
Abstract
No abstract record available.
Inventors
- 👤 Schneider Abraham
- 👤 Archibald P Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:54
CPC Classifications
C; C10; C10G; C10G71/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
METHOD FOR REFINING MINERAL LUBRICATING OIL WHICH COMPRISES: CONTACTING SUCH OIL WITH ANHYDROUS GASEOUS SO3 UNDER SULFONATING CONDITIONS, THEREBY TO FORM OILSOLUBLE SULFONIC ACIDS; NEUTRALIZING THE LATTER WITH CAUSTIC SODA; EXTRACTING THE OIL-SOLUBLE SODIUM SULFONATES FROM THE PRODUCT OIL BY MEANS OF AQUEOUS ISOPROPANOL AS SOLVENT; ADDING AN AQUEOUS SOLUTION OF 0.01 TO 10 PARTS BY WEIGHRT OF SODIUM HYDROXIDE TO 100 PARTS BY WEIGHT OF THE RAFFINATE PRODUCED IN SAID EXTRACTING; CONTACTING THE RAFFINATE AND SODIUM HYDROXIDE AT 50-300* C. FOR 0.25 TO HOURS; AND DISTILLING THE RAFFINATE IN THE PRESENCE OF THE SODIUM HYDROXIDE TO OBTAIN A REFINED DISTILLATE PRODUCT.
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US1929489A
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US1824615A
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US1964953A
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Cited
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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) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |