US2495489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of n-halo derivatives of organic sulfonamides
Assignee: Shell Development Co
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Filing: 1947-07-30
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Granted: 1950-01-24
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Expires: 1967-07-30
Abstract
No abstract record available.
Inventors
- 👤 Eleonoor Eduard Van Andel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:35
CPC Classifications
C; C07; C07C; C07C311/00; C07C311/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
IN A PROCESS FOR CONVERTING PARA-TOLUENE SULFONAMIDE IN AN AQUEOUS ALKALINE MEDIUM, TO THE N,N-DICHLOROSULFONAMIDE, THE IMPROVEMENT WHICH COMPRISES, DISSOLVING THE SULFONAMIDE, SODIUM HYDROXIDE AND SODIUM CARBONATE IN MOLAR PROPORTIONS OF SUBSTANTIALLY 1:1:0.5 IN SUFFICIENT WATER TO FORM A SUBSTANTIALLY HOMOGENEOUS SOLUTION, AND INTRODUCING INTO THE SOLUTION, AT ABOUT ROOM TEMPERATURE UNDER ATMOSPHERIC PRESSURE, SUBSTANTIALLY 2 MOLES OF CHLORINE PER MOLE OF SULFONAMIDE.
Claim 2
Dependent Claim
63 words
IN A PROCESS FOR CONVERTING PARA-TOLUENE SULFONAMIDE IN AN AQUEOUS ALKALINE MEDIUM, TO THE N,N-DICHLOROSULFONAMIDE, THE IMPROVEMENT WHICH COMPRISES, DISSOLVING THE SULFONAMIDE, SODIUM HYDROXIDE AND SODIUM CARBONATE IN MOLAR PROPORTIONS OF SUBSTANTIALLY 1:1:0.5 IN SUFFICIENT WATER TO FORM A SUBSTANTIALLY HOMOGENEOUS SOLUTION, AND INTRODUCING INTO THE SOLUTION, AT ABOUT ROOM TEMPERATURE UNDER ATMOSPHERIC PRESSURE, SUBSTANTIALLY 2 MOLES OF CHLORINE PER MOLE OF SULFONAMIDE.
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) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |