US2664439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of benzoic-p-sulfonamide
Assignee: Ruhrchemie AG
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Filing: 1952-06-27
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Granted: 1953-12-29
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Expires: 1972-06-27
Abstract
No abstract record available.
Inventors
- 👤 Feichtinger Hans
- 👤 Puschhof Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:18
CPC Classifications
C; C07; C07C; C07C311/00; C07C311/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
PROCESS FOR THE PRODUCTION OF BENZOIC-P-SULFONAMIDE, WHICH COMPRISES REACTING A CHLORINATION MIXTURE FROM THE CHLORINATION OF P-TOLUENESULFONIC SODIUM CONTAINING BENZYL-CHLORIDE-PSULFONIC SODIUM, BENZALCHLORIDE-P-SULFONIC SODIUM AND BENZOTRICHLORIDE-P-SULFONIC SODIUM WITH PHOSPHORUS PENTACHLORIDE, REACTING THE RESULTING ANALOGOUS SULFO-CHLORIDE MIXTURE WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF AQUEOUS AMMONIUM POLYSULFIDE SOLUTION AND AQUEOUS AMMONIA SOLUTION WITH SULFUR AT AN ELEVATED TEMPERATURE AND PRESSURE, AND RECOVERING THE AMMONUM SALT OF BENZOIC-P-SULFONAMIDE FOR ACIDIFICATION TO BENZOIC-P-SULFONAMIDE.
Claim 2
Dependent Claim
71 words
PROCESS FOR THE PRODUCTION OF BENZOIC-P-SULFONAMIDE, WHICH COMPRISES REACTING A CHLORINATION MIXTURE FROM THE CHLORINATION OF P-TOLUENESULFONIC SODIUM CONTAINING BENZYL-CHLORIDE-PSULFONIC SODIUM, BENZALCHLORIDE-P-SULFONIC SODIUM AND BENZOTRICHLORIDE-P-SULFONIC SODIUM WITH PHOSPHORUS PENTACHLORIDE, REACTING THE RESULTING ANALOGOUS SULFO-CHLORIDE MIXTURE WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF AQUEOUS AMMONIUM POLYSULFIDE SOLUTION AND AQUEOUS AMMONIA SOLUTION WITH SULFUR AT AN ELEVATED TEMPERATURE AND PRESSURE, AND RECOVERING THE AMMONUM SALT OF BENZOIC-P-SULFONAMIDE FOR ACIDIFICATION TO BENZOIC-P-SULFONAMIDE.
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) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |