US2654692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent dewaxing
Assignee: Texaco Development Corp
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Filing: 1950-04-07
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Granted: 1953-10-06
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Expires: 1970-04-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Wynkoop Kiersted
- 👤 Howard H Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:34
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
IN THE PRODUCTION OF A LOW POUR-TEST HYDROCARBON OIL FROM WAX-BEARING STOCK INVOLVING DEWAXING SAID STOCK FROM A COLD SOLUTION THEREOF IN A DEWAXING SOLVENT, BY STEPS COMPRISING MIXING THE OIL WITH A SOLVENT HAVING SUBSTANTIALLY COMPLETE SOLVENT ACTION UPON THE LIQUID HYDROCARBON CONSTITUENTS OF THE STOCK AT DEWAXING TEMPERATURE, CHILLING THE MIXTURE TO A DEWAXING TEMPERATURE TO CRYSTALLIZE WAXES,AND FILTERING THE COLD MIXTURE IN A FILTERATION STAGE TO PRODUCE A FILTRATE CONTAINING A PRODUCT OIL AND A PRIMARY FILTER CAKE OF WAX SUBSTANTIALLY FREE FROM OIL, THE IMPROVEMENT WHICH COMPRISES SEPARATING FROM SAID PRIMARY FILTER CAKE A SOFT WAX FRACTION BY REPULPING SAID WAX CAKE IN SAID SOLVENT AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 10 TO 40* F. ABOVE SAID DEWAXING TEMPERATURE,BUT NOT IN ANY EVENT AT A TEMPERATURE GREATER THAN 25* F., AND COMBINING SEPARATED SOFT WAX FRACTION WITH THE DEWAXED OIL TO YIELD AN INCREASED QUANTITY OF PRODUCT OIL OF UNALTERED POUR PROPERTIES.
Claim 2
Dependent Claim
158 words
IN THE PRODUCTION OF A LOW POUR-TEST HYDROCARBON OIL FROM WAX-BEARING STOCK INVOLVING DEWAXING SAID STOCK FROM A COLD SOLUTION THEREOF IN A DEWAXING SOLVENT, BY STEPS COMPRISING MIXING THE OIL WITH A SOLVENT HAVING SUBSTANTIALLY COMPLETE SOLVENT ACTION UPON THE LIQUID HYDROCARBON CONSTITUENTS OF THE STOCK AT DEWAXING TEMPERATURE, CHILLING THE MIXTURE TO A DEWAXING TEMPERATURE TO CRYSTALLIZE WAXES,AND FILTERING THE COLD MIXTURE IN A FILTERATION STAGE TO PRODUCE A FILTRATE CONTAINING A PRODUCT OIL AND A PRIMARY FILTER CAKE OF WAX SUBSTANTIALLY FREE FROM OIL, THE IMPROVEMENT WHICH COMPRISES SEPARATING FROM SAID PRIMARY FILTER CAKE A SOFT WAX FRACTION BY REPULPING SAID WAX CAKE IN SAID SOLVENT AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 10 TO 40* F. ABOVE SAID DEWAXING TEMPERATURE,BUT NOT IN ANY EVENT AT A TEMPERATURE GREATER THAN 25* F., AND COMBINING SEPARATED SOFT WAX FRACTION WITH THE DEWAXED OIL TO YIELD AN INCREASED QUANTITY OF PRODUCT OIL OF UNALTERED POUR PROPERTIES.
Claim 3
Dependent Claim
156 words
IN THE PRODUCTION OF A LOW POUR-TEST HYDROCARBON OIL FROM WAX-BEARING STOCK INVOLVING DEWAXING SAID STOCK FROM A COLD SOLUTION THEREOF IN A DEWAXING SOLVENT, BY STEPS COMPRISING MIXING THE OIL WITH A SOLVENT, CHILLING THE MIXTURE TO A DEWAXING TEMPERATURE TO CRYSTALLIZE WAXES, AND FILTERING THE COLD MIXTURE TO PRODUCE A PRIMARY DEWAXED PRODUCT OIL FILTRATE AND A PRIMARY WAX FILTER CAKE, THE IMPROVEMENT WHICH COMPRISES TREATING SAID PRIMARY WAX FILTER CAKE WITH ADDITIONAL SAID SOLVENT AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 10 TO 40* F. HIGHER THAN SAID DEWAXING TEMPERATURE BUT NOT IN ANY EVENT GREATER THAN A TEMPERATURE OF 25* F., TO SEPARATE THEREFROM AN EXTRACT SOFT WAX FRACTION, AND CONTINUOUSLY INTRODUCING SEPARATED SOFT WAX FRACTION AS A FEED TO SAID PRIMARY DEWAXING OPERATION THEREBY CAUSING SAID SOFT WAX FRACTION TO PASS INTO THE PRIMARY FILTRATE TO SUBSTANTIALLY AUGMENT THE QUANTITY OF PRODUCT OIL WITHOUT DETRACTING FROM ITS POUR PROPERTIES.
Claim 4
Dependent Claim
156 words
IN THE PRODUCTION OF A LOW POUR-TEST HYDROCARBON OIL FROM WAX-BEARING STOCK INVOLVING DEWAXING SAID STOCK FROM A COLD SOLUTION THEREOF IN A DEWAXING SOLVENT, BY STEPS COMPRISING MIXING THE OIL WITH A SOLVENT, CHILLING THE MIXTURE TO A DEWAXING TEMPERATURE TO CRYSTALLIZE WAXES, AND FILTERING THE COLD MIXTURE TO PRODUCE A PRIMARY DEWAXED PRODUCT OIL FILTRATE AND A PRIMARY WAX FILTER CAKE, THE IMPROVEMENT WHICH COMPRISES TREATING SAID PRIMARY WAX FILTER CAKE WITH ADDITIONAL SAID SOLVENT AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 10 TO 40* F. HIGHER THAN SAID DEWAXING TEMPERATURE BUT NOT IN ANY EVENT GREATER THAN A TEMPERATURE OF 25* F., TO SEPARATE THEREFROM AN EXTRACT SOFT WAX FRACTION, AND CONTINUOUSLY INTRODUCING SEPARATED SOFT WAX FRACTION AS A FEED TO SAID PRIMARY DEWAXING OPERATION THEREBY CAUSING SAID SOFT WAX FRACTION TO PASS INTO THE PRIMARY FILTRATE TO SUBSTANTIALLY AUGMENT THE QUANTITY OF PRODUCT OIL WITHOUT DETRACTING FROM ITS POUR PROPERTIES.
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) | 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 |