Patent US2880159A successfully refreshed from Google Patents.
US2880159A
Expired / Lapsed
US
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Solvent dewaxing of petroleum oil
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1955-07-20
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Granted: 1959-03-31
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Expires: 1975-07-20
Abstract
No abstract record available.
Inventors
- 👤 James G Livingston
- 👤 Alfred G Moreton
- 👤 John L Tiedje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:42
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN A METHOD OF SEPARATING A HYDROCARBON WAX FROM A HYDROCARBON WAX-OIL MIXTURE WHEREIN THE MIXTURE IS CHILLED IN THE PRESENCE OF A KETONE DEWAXING SOLVENT TO A TEMPERATURE SUFFICIENT TO CRYSTALLIZE THE WAX AND THE WAX IS THEREAFTER SEPARATED FROM THE OIL AND SOLVENT, THE IMPROVEMENT WHICH COMPRISES CHILLING THE MIXTURE BY THE ADDITION OF SOLVENT WHICH HAS BEEN PERCHILLED TO A TEMPERTURE SUFFICIENTLY BELOW THE SEPARATION TEMPERATURE TO CAUSE THE RESULTING BLEND OF SOLVENT AND MIXTURE TO REACH THE DESIRED SEPARATION TEMPERATURE WHEN THE AMOUNT OF SOLVENT NECESSARY TO PROVIDE THE DESIRED SOLVENT DILUTION HAS BEEN ADDED, THE RATE OF SOLVENT ADDITION BEING CON-
Claim 2
Dependent Claim
106 words
IN A METHOD OF SEPARATING A HYDROCARBON WAX FROM A HYDROCARBON WAX-OIL MIXTURE WHEREIN THE MIXTURE IS CHILLED IN THE PRESENCE OF A KETONE DEWAXING SOLVENT TO A TEMPERATURE SUFFICIENT TO CRYSTALLIZE THE WAX AND THE WAX IS THEREAFTER SEPARATED FROM THE OIL AND SOLVENT, THE IMPROVEMENT WHICH COMPRISES CHILLING THE MIXTURE BY THE ADDITION OF SOLVENT WHICH HAS BEEN PERCHILLED TO A TEMPERTURE SUFFICIENTLY BELOW THE SEPARATION TEMPERATURE TO CAUSE THE RESULTING BLEND OF SOLVENT AND MIXTURE TO REACH THE DESIRED SEPARATION TEMPERATURE WHEN THE AMOUNT OF SOLVENT NECESSARY TO PROVIDE THE DESIRED SOLVENT DILUTION HAS BEEN ADDED, THE RATE OF SOLVENT ADDITION BEING CON-
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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) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |