US2523154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of petroleum phenols
Assignee: Standard Oil Development Co
•
Filing: 1947-09-27
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Granted: 1950-09-19
•
Expires: 1967-09-27
Abstract
No abstract record available.
Inventors
- 👤 Albert J Shmidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:38
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/005; C07C37/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PROCESS FOR RECOVERING PHENOLIC MATERIALS FROM AN AQUEOUS ALKALINE LIQUOR CONTAINING THEM WHICH COMPRISES PARTIALLY NEUTRALIZING THE ALKALINE LIQUOR WITH A QUANTITY OF A MINERAL ACID IN THE RANGE BETWEEN 10% TO 50% OF THE THEORETICAL ACID REQUIREMENT FOR COMPLETE NEUTRALIZATION OF SAID ALKALINE LIQUOR TO FORM A FIRST HOMOGENOUS SOLUTION, EXTRACTING SAID FIRST SOLUTION BY AGITATING SAME WIT'' A HYDROCARBON SOLVENT, SETTLING SAID AGITATED SOLUTION, TO FORM AN EXTRACT PHASE AND A RAFFINATE PHASE, SUBJECTING THE REAFFINATE TO TREATMENT WITH AN ADDITIONAL AMOUNT OF A MINERAL ACID TO FORM A SECOND SOLUTION HAVING A PH OF APPROXIMATELY 9, SEPARATING AN OIL PHASE FROM SAID SECOND SOLUTION, AND RECOVERING PHENOLIC MATERIAL FROM THE OIL PHASE.
Claim 2
Dependent Claim
116 words
A PROCESS FOR RECOVERING PHENOLIC MATERIALS FROM AN AQUEOUS ALKALINE LIQUOR CONTAINING THEM WHICH COMPRISES PARTIALLY NEUTRALIZING THE ALKALINE LIQUOR WITH A QUANTITY OF A MINERAL ACID IN THE RANGE BETWEEN 10% TO 50% OF THE THEORETICAL ACID REQUIREMENT FOR COMPLETE NEUTRALIZATION OF SAID ALKALINE LIQUOR TO FORM A FIRST HOMOGENOUS SOLUTION, EXTRACTING SAID FIRST SOLUTION BY AGITATING SAME WIT'' A HYDROCARBON SOLVENT, SETTLING SAID AGITATED SOLUTION, TO FORM AN EXTRACT PHASE AND A RAFFINATE PHASE, SUBJECTING THE REAFFINATE TO TREATMENT WITH AN ADDITIONAL AMOUNT OF A MINERAL ACID TO FORM A SECOND SOLUTION HAVING A PH OF APPROXIMATELY 9, SEPARATING AN OIL PHASE FROM SAID SECOND SOLUTION, AND RECOVERING PHENOLIC MATERIAL FROM THE OIL PHASE.
References Cited (Backward Citations)
GB386977A
Cited
US2391128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |