Patent US2560548A successfully refreshed from Google Patents.
US2560548A
Expired / Lapsed
US
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Method of processing solvent-ex
Assignee: —
•
Filing: —
•
Granted: 1951-07-17
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Expires: 1968-07-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:29
CPC Classifications
C; C10; C10M; C10M159/00; C10M159/12; C10M159/123; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/04; C10M2223/00; C10M2223/10; C10M2223/12; C10M2225/00; C10M2225/04; C10M2227/00; C10M2227/02; C10M2229/00; C10M2229/04; C10M2229/041; C10N; C10N2010/00; C10N2010/04; C10N2010/06; C10N2010/08; C10N2010/10; C10N2010/12; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A METHOD OF FURTHER PROCESSING SOLVENT-EXTRACTED LUBRICATING OIL STOCK CONSISTING ESSENTIALLY OF HYDROCARBON MATERIAL TO YIELD AN OIL HAVING IMPROVED INHIBITION TO OXIDATION IN SERVICE, WHICH METHOD COMPRISES TREATING SAID STOCK WITH AN AMOUNT OF A PHOSPHORUS SULFIDE IN THE RANGE OF ABOUT 0.1 TO ABOUT 0.75% BY WEIGHT AT A TEMPERATURE IN THE RANGE OF ABOUT 275* TO 450* F., THEN WITH AN AMOUNT OF A BASE IN THE RANGE OF ABOUT 0.25 TO 6.0 EQUIVALENTS PER MOL OF THE PHOSPHORUS SULFIDE, AND INCLUDING AT LEAST ONE SEPARATE CLAY TREATING SUBSEQUENT TO THE SULFIDE TREATMENT.
Claim 2
Independent Claim
96 words
A METHOD OF FURTHER PROCESSING SOLVENT-EXTRACTED LUBRICATING OIL STOCK CONSISTING ESSENTIALLY OF HYDROCARBON MATERIAL TO YIELD AN OIL HAVING IMPROVED INHIBITION TO OXIDATION IN SERVICE, WHICH METHOD COMPRISES TREATING SAID STOCK WITH AN AMOUNT OF A PHOSPHORUS SULFIDE IN THE RANGE OF ABOUT 0.1 TO ABOUT 0.75% BY WEIGHT AT A TEMPERATURE IN THE RANGE OF ABOUT 275* TO 450* F., THEN WITH AN AMOUNT OF A BASE IN THE RANGE OF ABOUT 0.25 TO 6.0 EQUIVALENTS PER MOL OF THE PHOSPHORUS SULFIDE, AND INCLUDING AT LEAST ONE SEPARATE CLAY TREATING SUBSEQUENT TO THE SULFIDE TREATMENT.
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) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |