US2847356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation dewaxing
Assignee: Shell Development Co
•
Filing: 1953-09-15
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Granted: 1958-08-12
•
Expires: 1973-09-15
Abstract
No abstract record available.
Inventors
- 👤 Pieters Willem Johan
- 👤 Alders Lucas
- 👤 Doorn Johannis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:48
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A FLOTATION PROCESS OF DEWAXING OILS WHEREIN A MIXTURE OF SAID WAX AND OIL IS SEPARATED INTO AN OIL PRODUCT CONTAINING A SMALLER PROPORTION OF WAX THAN IN SAID MIXTURE AND A WAX PRODUCT CONTAINING A SMALLER PROPORTION OF OIL THAN IN SAID MIXTURE TO A SURFACE THEREPASSING OF A GAS THROUGH SAID MIXTURE TO A SURFACE THEREOF IN THE PRESENCE OF LESS THAN ABOUT 1% BY WEIGHT OF A SEPARATE AQUEOUS PHASE THEREBY PRODUCING A WAX-BEARING GASEOUS FORTH AND A REMAINING OIL PHASE AS THE ONLY LIQUID PHASE AND SEPARATING SAID WAX-BEARING FROTH FROM SAID REMAINING OIL PHASE, THE IMPROVEMENT COMPRISING EFFECTING SAID PASSING OF GAS THROUGH SAID MIXTURE IN THE PRESENCE OF A MINOR AMOUNT OF AN AT LEAST PARTIALLY OILSOLUBLE SURFACE-ACTIVE AGENT.
Claim 2
Dependent Claim
126 words
IN A FLOTATION PROCESS OF DEWAXING OILS WHEREIN A MIXTURE OF SAID WAX AND OIL IS SEPARATED INTO AN OIL PRODUCT CONTAINING A SMALLER PROPORTION OF WAX THAN IN SAID MIXTURE AND A WAX PRODUCT CONTAINING A SMALLER PROPORTION OF OIL THAN IN SAID MIXTURE TO A SURFACE THEREPASSING OF A GAS THROUGH SAID MIXTURE TO A SURFACE THEREOF IN THE PRESENCE OF LESS THAN ABOUT 1% BY WEIGHT OF A SEPARATE AQUEOUS PHASE THEREBY PRODUCING A WAX-BEARING GASEOUS FORTH AND A REMAINING OIL PHASE AS THE ONLY LIQUID PHASE AND SEPARATING SAID WAX-BEARING FROTH FROM SAID REMAINING OIL PHASE, THE IMPROVEMENT COMPRISING EFFECTING SAID PASSING OF GAS THROUGH SAID MIXTURE IN THE PRESENCE OF A MINOR AMOUNT OF AN AT LEAST PARTIALLY OILSOLUBLE SURFACE-ACTIVE AGENT.
References Cited (Backward Citations)
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US1277935A
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US2229659A
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US2314994A
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US2645598A
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US2658854A
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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) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |