Patent US3574739A successfully refreshed from Google Patents.
US3574739A
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US
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Alkoxybenzenesulfonamides
Assignee: Wyeth LLC
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Filing: 1968-04-25
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Granted: 1971-04-13
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Expires: 1988-04-25
Abstract
Abstract N-(ALKOXYALKYLIDENE)ALKOXYBENZENENESULFONAMIDES (I) ARE PROVIDED BY A PROCESS COMPRISING TREATING AN O-HYDROXYBENZENESULFONAMIDE WITH A TRIALKYL ORTHOALKYLATE. ACID HYDROLYSIS OF (I) PROVIDES ALKOXYBENZENESULFONAMIDES (II). REACTION OF (II) WITH AN ALKYL HALIDE PROVIDES N-(ALKYL)ALKOXYBENZENESULFONAMIDES (III). COMPOUNDS I, II, III HAVE PHARMACOLOGICAL ACTIVITY, ESPECIALLY AS ANALGESICS.
Inventors
- 👤 Peter H L Wei
- 👤 Stanley C Bell
- 👤 Scott J Childress
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:09
CPC Classifications
C; C07; C07C; C07C311/00; C07C311/22; C07C311/29
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |