US2773807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Repmevg nakfflotnic lube-oil distoxatos
Assignee: —
•
Filing: —
•
Granted: 1956-12-11
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Expires: 1973-12-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:09
CPC Classifications
C; C10; C10G; C10G19/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
METHOD OF REFINING A LUBRICATING OIL DISTILLATE DERIVED FROM THE FRACTIONATION OF A NAPHTENIC CRUDE OIL, SAID DISTILLATE HAVING A VISCOSITY OF AT LEAST 1100 SUS AT 100* F., WHICH COMPRISES THE STEPS OF TREATING THE DISTILLATE WITH A EUTECTIC MIXTURE OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE IN AN AMOUNT AT LEAST ABOUT 0.06 PERCENT BY WEIGHT IN EXCESS OF THE AMOUNT OF HYDROXIDE REQUIRED TO NEUTRALIZE THE ACIDITY OF THE DISTILLATE, AND THEN REDISTILLING THE DISTILLATE IN THE PRESENCE OF THE ADDED HYDROXIDES.
Claim 2
Dependent Claim
84 words
METHOD OF REFINING A LUBRICATING OIL DISTILLATE DERIVED FROM THE FRACTIONATION OF A NAPHTENIC CRUDE OIL, SAID DISTILLATE HAVING A VISCOSITY OF AT LEAST 1100 SUS AT 100* F., WHICH COMPRISES THE STEPS OF TREATING THE DISTILLATE WITH A EUTECTIC MIXTURE OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE IN AN AMOUNT AT LEAST ABOUT 0.06 PERCENT BY WEIGHT IN EXCESS OF THE AMOUNT OF HYDROXIDE REQUIRED TO NEUTRALIZE THE ACIDITY OF THE DISTILLATE, AND THEN REDISTILLING THE DISTILLATE IN THE PRESENCE OF THE ADDED HYDROXIDES.
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) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |