US2625557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of acyl p-aminophenols with isopropyl alcohol
Assignee: Standard Oil Development Co
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Filing: 1951-06-30
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Granted: 1953-01-13
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Expires: 1971-06-30
Abstract
No abstract record available.
Inventors
- 👤 Delmer L Cottle
- 👤 David W Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:14
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
IN A PROCESS FOR THE PREPARATION OF LAUROYL P-AMINOPHENOL WHICH COMPRISES CONDENSING PARA AMINOPHENOL WITH LAURIC ACID, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF UTILIZING THE LAURIC ACID IN AN AMOUNT OF FROM 110 TO 200 MOLE PER CENT BASED ON THE P-AMINOPHENOL; DISSOLVING THE RESULTING REACTION PRODUCT IN A RELATIVELY ANHYDROUS ISOPROPYL ALCOHOL AT A TEMPERATURE CLOSE TO ITS BOILING POINT; ADDING WATER TO THE RESULTING SOLUTION; COOLING THE WATER, ISOPROPYL ALCOHOL SYSTEM TO A TEMPERATURE IN THE RANGE OF ABOUT 15* TO 30* C., WHEREBY THE LAURYL P-AMINOPHENOL COMES OUT OF THE SOLUTION BUT THE IMPURITIES REMAIN DISSOLVED; AND SEPARATING THE LAURYL P-AMINOPHENOL FROM THE RESIDUAL SYSTEM.
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) | 1956-01-13 | 1956-07-14 | 1957-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-13 | 1960-07-14 | 1961-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-13 | 1964-07-14 | 1965-01-13 | $7700.00 | Window Closed / Lapsed |