Patent US2455807A successfully refreshed from Google Patents.
US2455807A
Expired / Lapsed
US
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Preparation of substituted cyanoguanidine
Assignee: Wyeth Holdings LLC
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Filing: 1945-09-11
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Granted: 1948-12-07
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Expires: 1965-09-11
Abstract
No abstract record available.
Inventors
- 👤 Bryan C Redmon
- 👤 Daniel E Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:42
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/16; C07D295/20; C07D295/215; C07C; C07C279/00; C07C279/28; C07C309/00; C07C309/01; C07C309/02; C07C309/03; C07C309/13; C07C309/14; C07C309/15
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) | 1951-12-07 | 1952-06-07 | 1952-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-07 | 1956-06-07 | 1956-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-07 | 1960-06-07 | 1960-12-07 | $7700.00 | Window Closed / Lapsed |