US2688587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent dewaxing operation
Assignee: Standard Oil Development Co
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Filing: 1951-03-28
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Granted: 1954-09-07
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Expires: 1971-03-28
Abstract
No abstract record available.
Inventors
- 👤 Oldrich S Pokorny
- 👤 George A Speer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:46
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
PROCESS OF DEWAXING MINERAL OIL WHICH COMPRISES DILUTING THE OIL WITH A SOLVENT CONSISTING ESSENTIALLY OF ABOUT 80 TO 40% BY VOLUME OF AT LEAST ONE ALIPHATIC NORMAL KETONE SELECTED FROM THE GROUP OF KETONES HAVING 5 AND 6 CARBON ATOMS IN THE MOLECULE AND CONTAINING AN ALIPHATIC GROUP OF AT LEAST 3 CARBON ATOMS TOGETHER WITH ABOUT 20 TO 60% BY VOLUME OF DIETHYL KETONE, THEREAFTER CHILLING THE MIXTURE TO A TEMPERATURE AT WHICH WAX IS CAUSED TO PRECIPITATE, REMOVING THE WAX AND RECOVERING DEWAXED OIL.
Claim 2
Dependent Claim
87 words
PROCESS OF DEWAXING MINERAL OIL WHICH COMPRISES DILUTING THE OIL WITH A SOLVENT CONSISTING ESSENTIALLY OF ABOUT 80 TO 40% BY VOLUME OF AT LEAST ONE ALIPHATIC NORMAL KETONE SELECTED FROM THE GROUP OF KETONES HAVING 5 AND 6 CARBON ATOMS IN THE MOLECULE AND CONTAINING AN ALIPHATIC GROUP OF AT LEAST 3 CARBON ATOMS TOGETHER WITH ABOUT 20 TO 60% BY VOLUME OF DIETHYL KETONE, THEREAFTER CHILLING THE MIXTURE TO A TEMPERATURE AT WHICH WAX IS CAUSED TO PRECIPITATE, REMOVING THE WAX AND RECOVERING DEWAXED OIL.
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) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |