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US3594412A
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Process for the preparation of surfaceactive derivatives of 5 - sulfoisophthalic acid
Assignee: Dynamit Nobel AG
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Filing: 1970-06-09
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Granted: 1971-07-20
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Expires: 1990-06-09
Abstract
Abstract SURFACE-ACTIVE ESTER AND AMIDE SALTS OF 5-SULFOISOPHTHALIC ACID ARE PREPARED BY REACTING AN ALKALI OR ALKALINE EARTH METAL SALT OF 5-SULFOISOPHTHALIC ACID DIMETHYL ESTER WITH AN ALCOHOL OR AN AMINE HAVING 4 TO 12 CARBON ATOMS IN THE ALKYL GROUP TO PRODUCE THE DESIRED DIALKYL ESTER AND DIALKYL AMIDE SALTS, RESPECTIVELY, OF 5-SULFOISOPHTHALIC ACID.
Inventors
- 👤 Rudlf Burkhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:31
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/57; C07C309/59; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |