Patent US2914456A successfully refreshed from Google Patents.
US2914456A
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US
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Dewaxing of oils by line filtration followed by rotary filtration
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1957-02-28
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Granted: 1959-11-24
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Expires: 1977-02-28
Abstract
No abstract record available.
Inventors
- 👤 Joe F Moore
- 👤 Thomas H Royder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:18
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/025; B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/17; B01D29/50; B01D29/52; B01D29/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN THE DEWAXING OF A LUBRICATING OIL FRACTION IN WHICH A PRECIPATING-DILUENT SOLVENT IS EMPLOYED, THE METHOD WHICH INCLUDES THE STEPS OF FLOWING A CHILLED SOLUTION OF SAID LUBRICATING OIL AND SAID SOLVENT HAVING A CONCENTRATION OF WAX CRYSTALS IN THE RANGE FROM ABOUT 5 PERCENT TO ABOUT 10 PERCENT BY WEIGHT THROUGH AN ANNULAR SPACE ACROSS A FILTERING SURFACE IN A LINE FILTRATION ZONE AT A VELOCITY IN THE RANGE FROM ABOUT 5 TO ABOUT 15 FEET PER SECOND TO FORM A CONCENTRATED SLURRY CONTAIN-
Claim 2
Dependent Claim
86 words
IN THE DEWAXING OF A LUBRICATING OIL FRACTION IN WHICH A PRECIPATING-DILUENT SOLVENT IS EMPLOYED, THE METHOD WHICH INCLUDES THE STEPS OF FLOWING A CHILLED SOLUTION OF SAID LUBRICATING OIL AND SAID SOLVENT HAVING A CONCENTRATION OF WAX CRYSTALS IN THE RANGE FROM ABOUT 5 PERCENT TO ABOUT 10 PERCENT BY WEIGHT THROUGH AN ANNULAR SPACE ACROSS A FILTERING SURFACE IN A LINE FILTRATION ZONE AT A VELOCITY IN THE RANGE FROM ABOUT 5 TO ABOUT 15 FEET PER SECOND TO FORM A CONCENTRATED SLURRY CONTAIN-
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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) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |