US2698279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dewaxing mineral oils
Assignee: Shell Development Co
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Filing: 1952-11-03
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Granted: 1954-12-28
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Expires: 1972-11-03
Abstract
No abstract record available.
Inventors
- 👤 Mondria Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:29
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
173 words
A METHOD FOR DEWAXING WAXY OIL WHICH COMPRISES: (1) MIXING A WAXY OIL WITH A SUBSTANTIAL PROPORTION OF AN ORGANIC SOLVENT WHICH IS A SOLVENT FOR OIL BUT WHICH IS SUBSTANTIALLY A NON-SOLVENT FOR SOLID WAX: (2) ADJUSTING THE TEMPERATURE OF THE RESULTING MIXTURE TO A DEWAXING TEMPERATURE OF WHICH THE WAX SOLIDIFIES, THEREBY FORMING A DISPERSION OF SOLID WAX PARTICLES IN A LIQUID OIL PHASE WHICH IS A SOLUTION OF THE OIL AND SOLVENT; (3) COMMINGLING THE RESULTING DISPERSION OF SOLID WAX DISPERSED IN THE OIL PHASE WITH A SUBSTANTIAL PROPORTION, AT LEAST EQUAL IN VOLUME TO THE VOLUME OF THE OIL PHSE, OF AN AUXILIARY LIQUID WHICH IS A SUBSTANTIALLY IMMISCIBLE THEREWITH SAID WHICH HAS A DIELECTRIC CONSTANT HIGHER THAN THAT OF THE OIL PHASE, THE AUXILIARY LIQUID BEING AT THE DEWAXING TEMPERATURE, AND WITH A MINOR AMOUNT OF AN IONIC SURFACE-ACTIVE AGENT, WHEREBY TWO LIQUID PHASE RESULT, AN OIL PHASE CONTAINING DISSOLVED MINOR AMOUNTS OF THE AUXILIARY LIQUID AND SURFACE-ACTIVE AGENT AND AN AUXILIARY LIQUID PHASE CONTAINING DISSOLVED MINOR AMOUNTS
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) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |