US2479498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 1,2-disubstituted-3-cyanoguanidines
Assignee: Wyeth Holdings LLC
•
Filing: 1946-08-08
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Granted: 1949-08-16
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Expires: 1966-08-08
Abstract
No abstract record available.
Inventors
- 👤 Hans Z Lecher
- 👤 Parker Robert Prescott
- 👤 Long Robert Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:05
CPC Classifications
C; C07; C07C; C07C323/00; C07C323/23; C07C323/39; C07C323/43; C07C323/44; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 0
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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) | 1952-08-15 | 1953-02-14 | 1953-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-15 | 1957-02-14 | 1957-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-15 | 1961-02-14 | 1961-08-16 | $7700.00 | Window Closed / Lapsed |