Patent US2816892A successfully refreshed from Google Patents.
US2816892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyridazinesulfonamides
Assignee: Wyeth Holdings LLC
•
Filing: 1956-08-24
•
Granted: 1957-12-17
•
Expires: 1976-08-24
Abstract
No abstract record available.
Inventors
- 👤 Young Richard William
- 👤 James W Clapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:35
CPC Classifications
C; C07; C07D; C07D237/00; C07D237/02; C07D237/06; C07D237/10; C07D237/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
4 words
PYRIDAZINESULFONAMIDES OF THE FORMULA:
Claim 2
Dependent Claim
4 words
PYRIDAZINESULFONAMIDES OF THE FORMULA:
Claim 3
Independent Claim
8 words
THE METHOD OF PREPARING PYRIDAZINESULFONAMIDES OF THE FORMULA:
Claim 4
Independent Claim
8 words
THE METHOD OF PREPARING PYRIDAZINESULFONAMIDES OF THE FORMULA:
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) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |