US2952639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of detergent compositions
Assignee: Stepan Co
•
Filing: 1954-06-30
•
Granted: 1960-09-13
•
Expires: 1974-06-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Vincent A Sullivan
- 👤 Ptasinski Zdzislaw Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:00
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/02; C11D1/12; C11D1/22; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A METHOD OF PRODUCING A SUBSTANTIALLY INORGANIC SALT-FREE DETERGENT FROM A COMPOSITION CONSISTING ESSENTIALLY OF A WATER-SOLUBLE ALKARYL ANIOMIC SULFONATED DETERGENT SALT HAVING A LONG ALIPHATIC CHAIN OF 8 TO 22 CARBON ATOMS CONTAINING 1 TO 20 WEIGHT PERCENT THEREOF OF AN ALKALI METAL SULFATE SALT AND HAVING A PH OF JUST LESS THAN 7, WHICH METHOD COMPRISES INTIMATELY ADMIXING THE COMPOSITION WITH SUBSTANTIALLY AN EQUAL WEIGHT OF ETHANOL AND WATER IN VOLUME RATIO OF 50:50 TO 60:40, MAINTAINING THE ADMIXTURE AT 120-150*F. FOR A TIME SUFFICIENT TO COMPLETELY DISSOLVE THE SULFONATED DETERGENT AND TO EFFECTIVELY CRYSTALLIZE THE UNDISSOLVED SULFATE SALT PARTICLES THEREIN, AND THEN SEPARATING THE CRYSTALLIZED SALT PARTICLES FROM THE DISSOLVED DETERGENT AND NEUTRALIZING THE DETERGENT TO AT LEAST PH 7.
Claim 2
Independent Claim
123 words
A METHOD OF PRODUCING A SUBSTANTIALLY INORGANIC SALT-FREE DETERGENT FROM A COMPOSITION CONSISTING ESSENTIALLY OF A WATER-SOLUBLE ALKARYL ANIOMIC SULFONATED DETERGENT SALT HAVING A LONG ALIPHATIC CHAIN OF 8 TO 22 CARBON ATOMS CONTAINING 1 TO 20 WEIGHT PERCENT THEREOF OF AN ALKALI METAL SULFATE SALT AND HAVING A PH OF JUST LESS THAN 7, WHICH METHOD COMPRISES INTIMATELY ADMIXING THE COMPOSITION WITH SUBSTANTIALLY AN EQUAL WEIGHT OF ETHANOL AND WATER IN VOLUME RATIO OF 50:50 TO 60:40, MAINTAINING THE ADMIXTURE AT 120-150*F. FOR A TIME SUFFICIENT TO COMPLETELY DISSOLVE THE SULFONATED DETERGENT AND TO EFFECTIVELY CRYSTALLIZE THE UNDISSOLVED SULFATE SALT PARTICLES THEREIN, AND THEN SEPARATING THE CRYSTALLIZED SALT PARTICLES FROM THE DISSOLVED DETERGENT AND NEUTRALIZING THE DETERGENT TO AT LEAST PH 7.
References Cited (Backward Citations)
US2316719A
Cited
US2283199A
Cited
US2463497A
Cited
US2567854A
Cited
US2467130A
Cited
US2678906A
Cited
US2687420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |