US3661516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing ammonium amido-sulfonate
Assignee: Hoechst AG
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Filing: 1970-03-17
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Granted: 1972-05-09
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Expires: 1990-03-17
Abstract
Abstract Amido-sulfonic acid and its salts are prepared by direct reaction of sulfuric anhydride with ammonia. The reaction is effected in such a way that a molten reaction product is obtained. By means of this process the reaction heat can be utilized and at the same time high space-time yields are obtained.
Inventors
- 👤 Heinz-Karl Hofmeister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:13
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/087; C01B21/092; C01B21/0923; C01B21/0926
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
28 words
A process in accordance with claim 1, wherein a temperature of between 120* and 350* C., preferably between 160* and 300* C., is adjusted in the reaction vessel.
Claim 2
Dependent Claim
28 words
A process in accordance with claim 1, which comprises carrying out the reaction under a pressure of between one and 30 atmospheres, preferably between 1.5 and 15 atmospheres.
Claim 3
Dependent Claim
25 words
A process in accordance with claim 1, which comprises maintaining the reaction temperature by means of a heat exchanger placed into the molten reaction mixture.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |