Patent EP0386472A2 successfully refreshed from Google Patents.
Patent US2654693A successfully refreshed from Google Patents.
US2654693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dewaxing mineral oil
Assignee: Shell Development Co
•
Filing: 1951-02-27
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Granted: 1953-10-06
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Expires: 1971-02-27
Abstract
No abstract record available.
Inventors
- 👤 Charles F Sacra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:30
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
THE PROCESS OF DEWAXING A SUBSTANTIALLY ASPHALT-FREE WAX-CONTAINING MINERAL LUBRICATING OIL DISTILLATE WHICH COMPRISES: COOLING A LIQUID ADMIXTURE OF SAID MINERAL OIL DISTILLATE AND A DEWAXING SOLVENT CONSISTING ESSENTIALLY OF METHYL ETHYL KETONE AND PROPANE, THE SOLVENT TO OIL VOLUME RATIO BEING FROM ABOUT 4:1 TO 6:1 AND THE KETON TO PROPANE VOLUME RATIO BEING FROM ABOUT 3:2 TO 4:1, TO PRECIPATE SOLDI WAX FROM THE OIL, AND SEPARATING THE PRECIPITATED WAX.
References Cited (Backward Citations)
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US1862874A
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US2045742A
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US2127708A
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US2137207A
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US2158672A
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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) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |