US2493596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for refining hydrocarbon oils
Assignee: Shell Development Co
•
Filing: 1947-06-09
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Granted: 1950-01-03
•
Expires: 1967-06-09
Abstract
No abstract record available.
Inventors
- 👤 Reman Gerrit Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:46
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06; C10G21/00; C10G21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
IN A PROCESS FOR THE REFINEMENT OF MINERAL LUBRICATING OILS WHICH CONTAIN IMPURITIES OF THE CHARACTER OF ASPHALTIC SUBSTANCES, WHEREIN THE MINERAL OILS ARE SUBJECTED TO SOLVENT EXTRACTION WITH A SELECTIVE SOLVENT FOR VARIOUS HYDROCARBONS PRESENT THEREIN, THE IMPROVEMENT WHICH COMPRISES PRECEDING SAID SOLVENT EXTRACTION BY TREATING SAID MINERAL OIL CONTAINING THE ASPHALTIC SUBSTANCES WITH A MINOR BUT ASPHALT-PRECIPITATING AMOUNT UP TO ABOUT 10% BY WEIGHT OF ANTIMONY TRICHLORIDE AS SOLE ACTIVE PRECIPITATING AGENT UNDER CONDITIONS TO PRECIPITATE AT LEAST A SUBSTANTIAL PORTION OF SAID IMPURITIES, AND SEPARATING THE RESULTING PRECIPITATED IMPURITIES FROM THE OIL PRIOR TO THE SOLVENT EXTRACTION OPERATION.
Claim 2
Dependent Claim
101 words
IN A PROCESS FOR THE REFINEMENT OF MINERAL LUBRICATING OILS WHICH CONTAIN IMPURITIES OF THE CHARACTER OF ASPHALTIC SUBSTANCES, WHEREIN THE MINERAL OILS ARE SUBJECTED TO SOLVENT EXTRACTION WITH A SELECTIVE SOLVENT FOR VARIOUS HYDROCARBONS PRESENT THEREIN, THE IMPROVEMENT WHICH COMPRISES PRECEDING SAID SOLVENT EXTRACTION BY TREATING SAID MINERAL OIL CONTAINING THE ASPHALTIC SUBSTANCES WITH A MINOR BUT ASPHALT-PRECIPITATING AMOUNT UP TO ABOUT 10% BY WEIGHT OF ANTIMONY TRICHLORIDE AS SOLE ACTIVE PRECIPITATING AGENT UNDER CONDITIONS TO PRECIPITATE AT LEAST A SUBSTANTIAL PORTION OF SAID IMPURITIES, AND SEPARATING THE RESULTING PRECIPITATED IMPURITIES FROM THE OIL PRIOR TO THE SOLVENT EXTRACTION OPERATION.
References Cited (Backward Citations)
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US2176884A
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US2246257A
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US2322083A
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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) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |