US2688035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutralization of sulfonic acids and sulfuric acid esters with the use of solid alkal i carbonates
Assignee: Ruhrchemie AG
•
Filing: 1952-04-22
•
Granted: 1954-08-31
•
Expires: 1972-04-22
Abstract
No abstract record available.
Inventors
- 👤 Jacob Eugen
- 👤 Kolling Helmut
- 👤 Stiebling Ewald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:34
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN A PROCESS FOR THE CONTINUOUS NEUTRALIZATION OF SULFONIC ACIDS WITH SOLID ALKALI CARBONATES BY INTIMATELY CONTACTING THE REACTANTS IN A FINELY DISPERSED FORM, THE IMPROVEMENT WHICH COMPRISES INTIMATELY CONTACTING THE FINELY DIVIDED DISPERSION OF A SULFONIC ACID WITH A QUANTITY OF THE DISPERSED, SOLID ALKALI CARBONATE OF ABOUT 1% TO 10% IN EXCESS OF THE QUANTITY REQUIRED FOR THE NEUTRALIZATION OF SAID SULFONIC ACID, HOMOGENIZING THE REACTION PRODUCT, ADDING AN ACID TO THE REACTION PRODUCT IN AMOUNT SUFFICIENT TO SUBSTANTIALLY NEUTRALIZE AT LEAST A PORTION OF THE EXCESS ALKALI CARBONATE CONTENT, FURTHER HOMOGENIZING AND DRYING THE PRODUCT.
Claim 2
Dependent Claim
98 words
IN A PROCESS FOR THE CONTINUOUS NEUTRALIZATION OF SULFONIC ACIDS WITH SOLID ALKALI CARBONATES BY INTIMATELY CONTACTING THE REACTANTS IN A FINELY DISPERSED FORM, THE IMPROVEMENT WHICH COMPRISES INTIMATELY CONTACTING THE FINELY DIVIDED DISPERSION OF A SULFONIC ACID WITH A QUANTITY OF THE DISPERSED, SOLID ALKALI CARBONATE OF ABOUT 1% TO 10% IN EXCESS OF THE QUANTITY REQUIRED FOR THE NEUTRALIZATION OF SAID SULFONIC ACID, HOMOGENIZING THE REACTION PRODUCT, ADDING AN ACID TO THE REACTION PRODUCT IN AMOUNT SUFFICIENT TO SUBSTANTIALLY NEUTRALIZE AT LEAST A PORTION OF THE EXCESS ALKALI CARBONATE CONTENT, FURTHER HOMOGENIZING AND DRYING THE PRODUCT.
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) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |