Patent US2726987A successfully refreshed from Google Patents.
US2726987A
Expired / Lapsed
US
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Solvent dewaxing of lubricating oil
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1952-09-08
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Granted: 1955-12-13
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Expires: 1972-09-08
Abstract
No abstract record available.
Inventors
- 👤 Robert A Macke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:28
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A METHOD OF DEWAXING A WAXY MINERAL OIL INCLUDING THE STEPS OF DISSOLVING A WAXY MINERAL OIL AT A TEMPERATURE ABOVE THE WAX NUCLEATION TEMPERATURE IN A SOLVENT HAVING ADMIXED THEREWITH WATER IN SUCH AN AMOUNT THAT UPON SOLUTION OF THE WAXY OIL IN THE SOLVENT TO FORM SOLVENT-WAXY OIL SOLUTION, FREE WATER WITHIN THE RANGE OF .25 TO 5% BY VOLUME BASED ON THE SOLVENT-WAXY OIL SOLUTION, WITH APPROXIMATELY 90% WITHIN THE PARTICLE SIZE RANGE OF 5 TO 20 MICRONS IS SEPARATED FROM THE SOLVENT-WAXY OIL SOLUTION AT APPROXIMATELY WAX NUCLEATION TEMPERATURE, CHILLING THE RESULTANT SOLUTION CONTAINING PARTICLES OF FREE WATER TO A TEMPERATURE SUBSTANTIALLY BELOW THE WAX NUCLEATION TEMPERATURE TO CAUSE WAX CRYSTALS TO FORM AND SUBSEQUENTLY SEPARATING A WAX CRYSTAL FRACTION FROM A WAX FREE OIL FRACTION.
Claim 2
Independent Claim
130 words
A METHOD OF DEWAXING A WAXY MINERAL OIL INCLUDING THE STEPS OF DISSOLVING A WAXY MINERAL OIL AT A TEMPERATURE ABOVE THE WAX NUCLEATION TEMPERATURE IN A SOLVENT HAVING ADMIXED THEREWITH WATER IN SUCH AN AMOUNT THAT UPON SOLUTION OF THE WAXY OIL IN THE SOLVENT TO FORM SOLVENT-WAXY OIL SOLUTION, FREE WATER WITHIN THE RANGE OF .25 TO 5% BY VOLUME BASED ON THE SOLVENT-WAXY OIL SOLUTION, WITH APPROXIMATELY 90% WITHIN THE PARTICLE SIZE RANGE OF 5 TO 20 MICRONS IS SEPARATED FROM THE SOLVENT-WAXY OIL SOLUTION AT APPROXIMATELY WAX NUCLEATION TEMPERATURE, CHILLING THE RESULTANT SOLUTION CONTAINING PARTICLES OF FREE WATER TO A TEMPERATURE SUBSTANTIALLY BELOW THE WAX NUCLEATION TEMPERATURE TO CAUSE WAX CRYSTALS TO FORM AND SUBSEQUENTLY SEPARATING A WAX CRYSTAL FRACTION FROM A WAX FREE OIL FRACTION.
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) | 1958-12-12 | 1959-06-13 | 1959-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-12 | 1963-06-13 | 1963-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-12 | 1967-06-13 | 1967-12-13 | $7700.00 | Window Closed / Lapsed |