US2403776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 2-(n4-acylsulphanilamido) pyrazine
Assignee: Wyeth Holdings LLC
•
Filing: 1943-08-25
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Granted: 1946-07-09
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Expires: 1963-08-25
Abstract
No abstract record available.
Inventors
- 👤 Philip S Winnek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:55
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/02; C07D241/10; C07D241/14; C07D241/20; C07D241/22
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) | 1949-07-08 | 1950-01-07 | 1950-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-07-08 | 1954-01-07 | 1954-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-07-08 | 1958-01-07 | 1958-07-09 | $7700.00 | Window Closed / Lapsed |