Patent US2455897A successfully refreshed from Google Patents.
US2455897A
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US
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1, 5-diarylbiguanides from aromatic amines and dicyanimide
Assignee: Wyeth Holdings LLC
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Filing: 1945-10-12
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Granted: 1948-12-07
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Expires: 1965-10-12
Abstract
No abstract record available.
Inventors
- 👤 Daniel E Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:43
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/45; C07C309/51; C07C279/00; C07C279/20; C07C279/24; C07C279/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1777738A
Cited
US2149709A
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US2121337A
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US2223935A
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US2331377A
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US2350453A
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US2357268A
Cited
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 |