Patent US2499236A successfully refreshed from Google Patents.
US2499236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of phenols
Assignee: Standard Oil Development Co
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Filing: 1947-12-03
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Granted: 1950-02-28
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Expires: 1967-12-03
Abstract
No abstract record available.
Inventors
- 👤 Carll F Van Gilder
- 👤 Jr Theodore J Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:46
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/84; C07C37/685
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN THE METHOD OF ISOLATING AND PURIFYING A CRYSTALLINE ALKYLATED PHENOL FROM AN ACIDIC CRUDE MIXTURE OF THE ALKYLATED PHENOL WHEREIN AN ACIDIC CATALYST HAS BEEN EMPLOYED, WHICH COMPRISES WASHING THE CRUDE MIXTURE WITH WATER, AGITATING THE THUS WASHED CRUDE MIXTURE WITH AN AQUEOUS ALCOHOL SOLUTION IN WHICH THE ALKYLATED PHENOL HAS SLIGHT SOLUBILITY AT 50*C., SO AS TO FORM A MASS OF TWO DISTINCT LIQUID PHASES, COOLING THE RESULTANT MASS OF SAID AQUEOUS ALCOHOL SOLUTION WITH SAID WASHED CRUDE MIXTURE UNTIL THE MASS BECOMES A SLUSH CONTAINING CRYSTALS OF THE ALKYLATED PHENOL, AND SEPARATING SAID CRYSTALS FROM THE REMAINING LIQUIDS, THE IMPROVEMENT WHICH COMPRISES ADDING 1 TO 3% BY VOLUME OF C12 TO C18 LONG CHAIN ALCOHOL SULFATES TO THE AQUEOUS ALCOHOL SOLUTION WHICH IS AGITATED WITH SAID WASHED CRUDE MIXTURE PRIOR TO SAID COOLING.
Claim 2
Dependent Claim
136 words
IN THE METHOD OF ISOLATING AND PURIFYING A CRYSTALLINE ALKYLATED PHENOL FROM AN ACIDIC CRUDE MIXTURE OF THE ALKYLATED PHENOL WHEREIN AN ACIDIC CATALYST HAS BEEN EMPLOYED, WHICH COMPRISES WASHING THE CRUDE MIXTURE WITH WATER, AGITATING THE THUS WASHED CRUDE MIXTURE WITH AN AQUEOUS ALCOHOL SOLUTION IN WHICH THE ALKYLATED PHENOL HAS SLIGHT SOLUBILITY AT 50*C., SO AS TO FORM A MASS OF TWO DISTINCT LIQUID PHASES, COOLING THE RESULTANT MASS OF SAID AQUEOUS ALCOHOL SOLUTION WITH SAID WASHED CRUDE MIXTURE UNTIL THE MASS BECOMES A SLUSH CONTAINING CRYSTALS OF THE ALKYLATED PHENOL, AND SEPARATING SAID CRYSTALS FROM THE REMAINING LIQUIDS, THE IMPROVEMENT WHICH COMPRISES ADDING 1 TO 3% BY VOLUME OF C12 TO C18 LONG CHAIN ALCOHOL SULFATES TO THE AQUEOUS ALCOHOL SOLUTION WHICH IS AGITATED WITH SAID WASHED CRUDE MIXTURE PRIOR TO SAID COOLING.
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) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |