US2540356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonamide derivatives
Assignee: Sharp and Dohme Inc
•
Filing: 1949-03-12
•
Granted: 1951-02-06
•
Expires: 1969-03-12
Abstract
No abstract record available.
Inventors
- 👤 James M Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:47
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/69
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A 4-SULFANILAMIDO-PYRIMIDINE OF THE GENERAL FORMULA
Claim 2
Dependent Claim
6 words
A 4-SULFANILAMIDO-PYRIMIDINE OF THE GENERAL FORMULA
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) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |