US3002995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of salts of dialkyl esters of sulfosuccinic acid
Assignee: Wyeth Holdings LLC
•
Filing: 1958-09-02
•
Granted: 1961-10-03
•
Expires: 1978-09-02
Abstract
No abstract record available.
Inventors
- 👤 Emil F Williams
- 👤 Norman T Woodberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:28
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PROCESS FOR PURIFYING MEMBERS SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL, AMMONIUM, AND ETHANOLAMINE SALTS OF DIALKYL ESTERS OF SULFOSUCCINIC ACID OF TECHNICAL GRADE, WHEREIN THE ALKY GROUPS CONTAIN FROM 1 TO 12 CARBON ATOMS, AND WHEREIN SAID SALTS CONTAIN UP TO ABOUT 1% OF IMPURITIES RESULTING FROM THEIR MANUFACTURING PROCESS, WHICH COMPRISES PREPARING A SOLUTION CONTAINING FROM BETWEEN 2 AND 15% OF SAID SALT IN A SOLVENT, MIXING SAID SOLUTION WITH ABOUT 1 TO 10% OF ACTIVATED CARBON BASED ON THE WEIGHT OF THE SOLUTION, FILTERING THE SOLUTION AND DRYING THE FILTRATE TO RECOVER THE PRODUCT.
Claim 2
Dependent Claim
99 words
A PROCESS FOR PURIFYING MEMBERS SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL, AMMONIUM, AND ETHANOLAMINE SALTS OF DIALKYL ESTERS OF SULFOSUCCINIC ACID OF TECHNICAL GRADE, WHEREIN THE ALKY GROUPS CONTAIN FROM 1 TO 12 CARBON ATOMS, AND WHEREIN SAID SALTS CONTAIN UP TO ABOUT 1% OF IMPURITIES RESULTING FROM THEIR MANUFACTURING PROCESS, WHICH COMPRISES PREPARING A SOLUTION CONTAINING FROM BETWEEN 2 AND 15% OF SAID SALT IN A SOLVENT, MIXING SAID SOLUTION WITH ABOUT 1 TO 10% OF ACTIVATED CARBON BASED ON THE WEIGHT OF THE SOLUTION, FILTERING THE SOLUTION AND DRYING THE FILTRATE TO RECOVER THE PRODUCT.
References Cited (Backward Citations)
US2028091A
Cited
US2316234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |