Patent US3943441A successfully refreshed from Google Patents.
Patent US2493596A successfully refreshed from Google Patents.
US2493596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for refining hydrocarbon oils
Assignee: Shell Development Co
•
Filing: 1947-06-09
•
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 14:00
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)
US1601753A
Cited
US1823558A
Cited
US2176884A
Cited
US2246257A
Cited
US2322083A
Cited
US2305248A
Cited
US2339786A
Cited
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 |