US2671797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutralization of sulfonic acids and sulfuric acid esters
Assignee: Ruhrchemie AG
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Filing: 1951-02-15
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Granted: 1954-03-09
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Expires: 1971-02-15
Abstract
No abstract record available.
Inventors
- 👤 Hagemann August
- 👤 Kolling Helmut
- 👤 Jacob Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:18
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
PROCESS FOR THE CONTINUOUS NEUTRALIZATION OF SULFONIC ACIDS AND SULFURIC ACID ESTERS WHICH COMPRISES INTIMATELY CONTACTING IN A REACTION ZONE A FINELY DIVIDED DISPERSION OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF SULFONIC ACIDS AND SULFURIC ACID ESTERS WITH A FINELY DIVIDED DISPERSION OF SOLID, DRY ALKALI CARBONATE IN AT LEAST AN EQUIVALENT QUANTITY WITH SAID GROUP MEMBER, AND RECOVERING A SULFONATED PRODUCT.
Claim 2
Dependent Claim
64 words
PROCESS FOR THE CONTINUOUS NEUTRALIZATION OF SULFONIC ACIDS AND SULFURIC ACID ESTERS WHICH COMPRISES INTIMATELY CONTACTING IN A REACTION ZONE A FINELY DIVIDED DISPERSION OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF SULFONIC ACIDS AND SULFURIC ACID ESTERS WITH A FINELY DIVIDED DISPERSION OF SOLID, DRY ALKALI CARBONATE IN AT LEAST AN EQUIVALENT QUANTITY WITH SAID GROUP MEMBER, AND RECOVERING A SULFONATED PRODUCT.
References Cited (Backward Citations)
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |