Patent US2467371A successfully refreshed from Google Patents.
US2467371A
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US
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Biguanide derivatives
Assignee: Imperial Chemical Industries Ltd
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Filing: 1945-05-25
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Granted: 1949-04-19
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Expires: 1965-05-25
Abstract
No abstract record available.
Inventors
- 👤 Curd Francis Henry Swinden
- 👤 Rose Francis Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:57
CPC Classifications
C; C07; C07C; C07C279/00; C07C279/28; C07C279/20; C07C279/24; C07C279/26; C07D; C07D295/00; C07D295/16; C07D295/20; C07D295/215
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1777738A
Cited
US2149709A
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US2265944A
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US2274412A
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US2289541A
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US2320225A
Cited
US2331377A
Cited
GB577843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-18 | 1952-10-18 | 1953-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-18 | 1956-10-18 | 1957-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-18 | 1960-10-18 | 1961-04-19 | $7700.00 | Window Closed / Lapsed |