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Patent US2543852A successfully refreshed from Google Patents.
US2543852A
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Surface active derivatives of nitrogen-containing sulfonic acids
Assignee: Sandoz AG
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Filing: 1947-10-24
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Granted: 1951-03-06
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Expires: 1967-10-24
Abstract
No abstract record available.
Inventors
- 👤 Jaccard Gaston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:53
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/02; C07C309/03; C07C309/04; C07C309/13; C07C309/14; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A PROCESS FOR THE PREPARATION OF A SURFACE ACTIVE DERIVATIVE OF A NITROGEN-CONTAINING ALIPHATIC SULFONIC ACID, WHICH COMPRISES REACTING, AT A TEMPERATURE BETWEEN 50* C. AND 120* C. UNDER ALKALINE CONDITIONS, AN AMIDE OF THE FORMULA
Claim 2
Dependent Claim
36 words
A PROCESS FOR THE PREPARATION OF A SURFACE ACTIVE DERIVATIVE OF A NITROGEN-CONTAINING ALIPHATIC SULFONIC ACID, WHICH COMPRISES REACTING, AT A TEMPERATURE BETWEEN 50* C. AND 120* C. UNDER ALKALINE CONDITIONS, AN AMIDE OF THE FORMULA
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) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |