US2497152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of petroleum sulfonates
Assignee: Standard Oil Development Co
•
Filing: 1946-12-31
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Granted: 1950-02-14
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Expires: 1966-12-31
Abstract
No abstract record available.
Inventors
- 👤 Charles A Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:48
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS FOR PURIFYING OIL SOLUBLE PETROLEUM SULFONATES DISSOLVED IN AN AQUEOUS SOLUTION OF A C2 TO C4 MONOHYDRIC ALCOHOL CONTAINING AT LEAST ABOUT 40% ALCOHOL WHICH COMPRISES TREATING SAID AQUEOUS ALCOHOLIC SOLUTION OF THE OIL SOLUBLE PETROLEUM SULFONATES WITH AN AQUEOUS SOLUTION OF SODIUM SULFATE CONTAINING AT LEAST 15 GRAMS OF SODIUM SULFATE PER 100 MLS. OF SOLUTION AT A TEMPERATURE BETWEEN 40 AND 70*C.
Claim 2
Dependent Claim
66 words
A PROCESS FOR PURIFYING OIL SOLUBLE PETROLEUM SULFONATES DISSOLVED IN AN AQUEOUS SOLUTION OF A C2 TO C4 MONOHYDRIC ALCOHOL CONTAINING AT LEAST ABOUT 40% ALCOHOL WHICH COMPRISES TREATING SAID AQUEOUS ALCOHOLIC SOLUTION OF THE OIL SOLUBLE PETROLEUM SULFONATES WITH AN AQUEOUS SOLUTION OF SODIUM SULFATE CONTAINING AT LEAST 15 GRAMS OF SODIUM SULFATE PER 100 MLS. OF SOLUTION AT A TEMPERATURE BETWEEN 40 AND 70*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |