US2863919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biguanides
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1956-02-03
•
Granted: 1958-12-09
•
Expires: 1976-02-03
Abstract
No abstract record available.
Inventors
- 👤 Birtwell Stanley
- 👤 Rose Francis Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:27
CPC Classifications
C; C07; C07C; C07C279/00; C07C279/20; C07C279/24; C07C279/26; C07C279/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
BISBIGUANIDES OF THE FORMULA:
Claim 2
Dependent Claim
4 words
BISBIGUANIDES OF THE FORMULA:
References Cited (Backward Citations)
US2410862A
Cited
US2455807A
Cited
US2455896A
Cited
US2620290A
Cited
US2684924A
Cited
US2690455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |