US2592490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of dewaxing oil and continuous rotary filter therefor
Assignee: ExxonMobil Oil Corp
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Filing: 1949-11-29
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Granted: 1952-04-08
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Expires: 1969-11-29
Abstract
No abstract record available.
Inventors
- 👤 James P Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:23
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/025; C11; C11B; C11B7/00; C11B7/0008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
THE METHOD OF REMOVING WAX FROM AN OILY FEED SLURRY IN A CLOSED CONTINUOUS FILTER, WHICH COMPRISES THE STEPS OF FORMING A WAX FILTER CAKE UPON A TRAVELING SURFACE WITHIN THE FILTER CHAMBER DRYING SAID CAKE AS IT EMERGES FROM THE FEED SLURRY, SPRAYING THE DRIED CAKE WITH A WASH LIQUID PREPARED AS HEREINAFTER DESCRIBED, SUBJECTING THE CAKE TO A SECONDARY SPRAYING WITH FRESHLY DISTILLED SOLVENT, RECYCLING THE OIL-SOLVENT FILTRATE OBTAINED AS A RESULT OF SAID SECONDARY SPRAYING FOR USE AS THE AFORESAID INITIAL WASH LIQUID, DISTILLING THE OIL-SOLVENT FILTRATE OBTAINED FROM INITIAL SPRAYING OF THE WAX CAKE, CHILLING THE RESULTING OVERHEAD SOLVENT PRODUCT AND RECYCLING THE SAME FOR USE IN THE SECONDARY SPRAY OPERATION, THEREAFTER DRYING THE WASHED FILTER CAKE, DISLODGING SAID CAKE BY BLOWING GAS THERETHROUGH AND REMOVING SAID DISLODGED CAKE FROM THE FILTER SURFACE.
Claim 2
Independent Claim
137 words
THE METHOD OF REMOVING WAX FROM AN OILY FEED SLURRY IN A CLOSED CONTINUOUS FILTER, WHICH COMPRISES THE STEPS OF FORMING A WAX FILTER CAKE UPON A TRAVELING SURFACE WITHIN THE FILTER CHAMBER DRYING SAID CAKE AS IT EMERGES FROM THE FEED SLURRY, SPRAYING THE DRIED CAKE WITH A WASH LIQUID PREPARED AS HEREINAFTER DESCRIBED, SUBJECTING THE CAKE TO A SECONDARY SPRAYING WITH FRESHLY DISTILLED SOLVENT, RECYCLING THE OIL-SOLVENT FILTRATE OBTAINED AS A RESULT OF SAID SECONDARY SPRAYING FOR USE AS THE AFORESAID INITIAL WASH LIQUID, DISTILLING THE OIL-SOLVENT FILTRATE OBTAINED FROM INITIAL SPRAYING OF THE WAX CAKE, CHILLING THE RESULTING OVERHEAD SOLVENT PRODUCT AND RECYCLING THE SAME FOR USE IN THE SECONDARY SPRAY OPERATION, THEREAFTER DRYING THE WASHED FILTER CAKE, DISLODGING SAID CAKE BY BLOWING GAS THERETHROUGH AND REMOVING SAID DISLODGED CAKE FROM THE FILTER SURFACE.
Claim 3
Dependent Claim
169 words
APPARATUS FOR CONTINUOUS DEWAXING OF A WAX-BEARING MINERAL OIL, COMPRISING, IN COMBINATION, A CONTINUOUS ROTARY FILTER INCLUDING A ROTATABLE FILTER DRUM SUPPORTING A CONTINUOUS FILTERING ELEMENT, A HOUSING ENCLOSING SAID DRUM, MEANS FOR CONTINUOUSLY DRYING THE WAX CAKE ON THE FILTERING ELEMENT, SPRAY DEVICES ADJACENT TO SAID DRYING MEANS FOR CONTINUOUSLY WASHING THE DREID CAKE, SPRAY DEVICES REMOTE FROM SAID DRYING MEANS FOR CONTINUOUSLY WASHING THE CAKE, MEANS FOR CONDUCTING FILTRATE LIQUID OBTAINED UPON SPRAYING THE WAX CAKE THROUGH SPRAY DEVICES REMOTE FROM SAID DRYING MEANS TO SPRAY DEVICES ADJACENT TO SAID DRYING MEANS, MEANS FOR DISTILLING THE FILTRATE LIQUID OBTAINED UPON SPRAYING THE WAX CAKE THROUGH SPRAY DEVICES ADJACENT TO SAID DRYING MEANS, MEAND FOR CHILLING WASH LIQUID RESULTING FROM SAID DISTILLATION, MEANS FOR CONDUCTING SAID CHILLED WASH LIQUID TO SPRAY DEVICES REMOTE FROM SAID DRYING MEANS, MEANS FOR CONTINUOUSLY DRYING THE WASHED CAKE, MEANS FOR DISLODGING THE CAKE FOR THE FILTERING ELEMENT BY BLOWING GAS THERETHROUGH AND MEANS FOR REMOVING SAID DISLODGED CAKE FROM SAID FILTERING ELEMENT.
Claim 4
Dependent Claim
169 words
APPARATUS FOR CONTINUOUS DEWAXING OF A WAX-BEARING MINERAL OIL, COMPRISING, IN COMBINATION, A CONTINUOUS ROTARY FILTER INCLUDING A ROTATABLE FILTER DRUM SUPPORTING A CONTINUOUS FILTERING ELEMENT, A HOUSING ENCLOSING SAID DRUM, MEANS FOR CONTINUOUSLY DRYING THE WAX CAKE ON THE FILTERING ELEMENT, SPRAY DEVICES ADJACENT TO SAID DRYING MEANS FOR CONTINUOUSLY WASHING THE DREID CAKE, SPRAY DEVICES REMOTE FROM SAID DRYING MEANS FOR CONTINUOUSLY WASHING THE CAKE, MEANS FOR CONDUCTING FILTRATE LIQUID OBTAINED UPON SPRAYING THE WAX CAKE THROUGH SPRAY DEVICES REMOTE FROM SAID DRYING MEANS TO SPRAY DEVICES ADJACENT TO SAID DRYING MEANS, MEANS FOR DISTILLING THE FILTRATE LIQUID OBTAINED UPON SPRAYING THE WAX CAKE THROUGH SPRAY DEVICES ADJACENT TO SAID DRYING MEANS, MEAND FOR CHILLING WASH LIQUID RESULTING FROM SAID DISTILLATION, MEANS FOR CONDUCTING SAID CHILLED WASH LIQUID TO SPRAY DEVICES REMOTE FROM SAID DRYING MEANS, MEANS FOR CONTINUOUSLY DRYING THE WASHED CAKE, MEANS FOR DISLODGING THE CAKE FOR THE FILTERING ELEMENT BY BLOWING GAS THERETHROUGH AND MEANS FOR REMOVING SAID DISLODGED CAKE FROM SAID FILTERING ELEMENT.
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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) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |