US3037042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying monoaminoalkyl sulfuric acid esters
Assignee: Jefferson Chemical Co Inc
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Filing: 1958-12-05
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Granted: 1962-05-29
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Expires: 1978-12-05
Abstract
No abstract record available.
Inventors
- 👤 George J Laemmle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:34
CPC Classifications
C; C07; C07D; C07D203/00; C07D203/04; C07D203/06; C07D203/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A METHOD OF PURIFYING A SOLID CRUDE ESTER PRODUCT OF THE FORMULA H2N-R-OSO3H WHERE R IS AN ALKYLENE RADICAL HAVING FROM 2 TO 7 CARBON ATOMS AND OF THE STRUCTURE -CR''2-(CR''2)N-CR''2-WHEREIN N IS AN INTEGER FROM 0 TO 3 AND R'' IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND A LOWER ALKYL RADICAL CONTAINING FROM 1 TO 3 CARBON ATOMS, COMPRISING DISSOLVING SAID ESTER IN WATER CONTAINING BETWEEN ABOUT 0.1 AND 1.0% OF A WATER SOLUBLE SALT DERIVED FROM THE REACTION OF A WEAK ACID HAVING AN IONIZATION CONSTANT OF LESS THAN 2X10-5 AT 25*C. AND A STRONG BASE HAVING AN IONIZATION CONSTANT OF AT LEAST 2X10-1 AT 25*C., SAID DISSOLVING AT A TEMPERATURE BETWEEN ABOUT 50 AND 125*C., SUBSEQUENTLY COOLING THE RESULTANT SOLUTION TO A TEMPERATURE BELOW ABOUT 40*C., TO SELECTIVELY PRECIPITATE SAID ESTER TO THEREBY PROVIDE A SLURRY OF PRECIPITATED ESTER IN MOTHER LIQUOR AND RECOVERING SAID PRECIPITATED ESTER FROM SAID MOTHER LIQUOR.
Claim 2
Independent Claim
156 words
A METHOD OF PURIFYING A SOLID CRUDE ESTER PRODUCT OF THE FORMULA H2N-R-OSO3H WHERE R IS AN ALKYLENE RADICAL HAVING FROM 2 TO 7 CARBON ATOMS AND OF THE STRUCTURE -CR''2-(CR''2)N-CR''2-WHEREIN N IS AN INTEGER FROM 0 TO 3 AND R'' IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND A LOWER ALKYL RADICAL CONTAINING FROM 1 TO 3 CARBON ATOMS, COMPRISING DISSOLVING SAID ESTER IN WATER CONTAINING BETWEEN ABOUT 0.1 AND 1.0% OF A WATER SOLUBLE SALT DERIVED FROM THE REACTION OF A WEAK ACID HAVING AN IONIZATION CONSTANT OF LESS THAN 2X10-5 AT 25*C. AND A STRONG BASE HAVING AN IONIZATION CONSTANT OF AT LEAST 2X10-1 AT 25*C., SAID DISSOLVING AT A TEMPERATURE BETWEEN ABOUT 50 AND 125*C., SUBSEQUENTLY COOLING THE RESULTANT SOLUTION TO A TEMPERATURE BELOW ABOUT 40*C., TO SELECTIVELY PRECIPITATE SAID ESTER TO THEREBY PROVIDE A SLURRY OF PRECIPITATED ESTER IN MOTHER LIQUOR AND RECOVERING SAID PRECIPITATED ESTER FROM SAID MOTHER LIQUOR.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-28 | 1965-11-27 | 1966-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-28 | 1969-11-27 | 1970-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-28 | 1973-11-27 | 1974-05-29 | $7700.00 | Window Closed / Lapsed |