US2523528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N' (4-hydroxy-4-isoimidazol-2-yl)sulfonamides and their production
Assignee: EIDP Inc
•
Filing: 1949-04-08
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Granted: 1950-09-26
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Expires: 1969-04-08
Abstract
No abstract record available.
Inventors
- 👤 Jonathan W Williams
- 👤 Thurmond A Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:28
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/88
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF N''(4-HYDROXY-4-ISOIMIDAZOL-2-Y)SULFANILAMIDES REPRESENTED BY THE FORMULA AND THEN ALKALI METAL SALTS, WHERE R AND R'' ARE SELECTED FROM THE CLASS CONSISTING OF HYDROGEN AND ALKYL.
Claim 2
Dependent Claim
32 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF N''(4-HYDROXY-4-ISOIMIDAZOL-2-Y)SULFANILAMIDES REPRESENTED BY THE FORMULA AND THEN ALKALI METAL SALTS, WHERE R AND R'' ARE SELECTED FROM THE CLASS CONSISTING OF HYDROGEN AND ALKYL.
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) | 1953-09-25 | 1954-03-27 | 1954-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-25 | 1958-03-27 | 1958-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-25 | 1962-03-27 | 1962-09-26 | $7700.00 | Window Closed / Lapsed |