US2990425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New biguanide salts
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1957-05-20
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Granted: 1961-06-27
•
Expires: 1977-05-20
Abstract
No abstract record available.
Inventors
- 👤 Senior Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:57
CPC Classifications
C; C07; C07C; C07C279/00; C07C279/20; C07C279/24; C07C279/26; C07C279/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2131127A
Cited
US2449987A
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US2666013A
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US2769746A
Cited
US2736749A
Cited
GB750501A
Cited
US2863919A
Cited
US2783276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |