US2910475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing benzothiadiazine-1, 1-dioxides
Assignee: Merck and Co Inc
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Filing: 1957-09-13
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Granted: 1959-10-27
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Expires: 1977-09-13
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Novello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:49
CPC Classifications
C; C07; C07D; C07D285/00; C07D285/15; C07D285/16; C07D285/18; C07D285/20; C07D285/22; C07D285/24; C07D285/26; C07D285/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A PROCESS FOR PREPARING A 7-SULFAMYL-1,2,4-BENZOTHIADIAZINE-1,1-DIOXIDE COMPOUND COMPRISING HEATING AT A TEMPERATURE RANGING BETWEEN 100 TO 165*C. A REACTION MIXTURE COMPRISING AN EXCESS OF A MOLAR EQUIVALENT OF CHLOROSULFONIC ACID AND A BENZOTHIADIAZINE-1,1-DIOXIDE COMPOUND HAVING ONE OF THE GENERAL STRUCTURE
Claim 2
Dependent Claim
40 words
A PROCESS FOR PREPARING A 7-SULFAMYL-1,2,4-BENZOTHIADIAZINE-1,1-DIOXIDE COMPOUND COMPRISING HEATING AT A TEMPERATURE RANGING BETWEEN 100 TO 165*C. A REACTION MIXTURE COMPRISING AN EXCESS OF A MOLAR EQUIVALENT OF CHLOROSULFONIC ACID AND A BENZOTHIADIAZINE-1,1-DIOXIDE COMPOUND HAVING ONE OF THE GENERAL STRUCTURE
References Cited (Backward Citations)
US2440117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-26 | 1963-04-27 | 1963-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-26 | 1967-04-27 | 1967-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-26 | 1971-04-27 | 1971-10-27 | $7700.00 | Window Closed / Lapsed |