US2826606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biguanide derivatives of naphthol sulfonic acids
Assignee: Wyeth Holdings LLC
•
Filing: 1956-01-31
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Granted: 1958-03-11
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Expires: 1976-01-31
Abstract
No abstract record available.
Inventors
- 👤 Robert S Long
- 👤 Tsang Sien Moo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:50
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/45; C07C309/51; C09; C09B; C09B33/00; C09B39/00; C09B43/00; C09B43/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
COMPOUNDS HAVING THE FORMULA:
Claim 2
Dependent Claim
4 words
COMPOUNDS HAVING THE FORMULA:
References Cited (Backward Citations)
US2455897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-10 | 1961-09-09 | 1962-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-10 | 1965-09-09 | 1966-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-10 | 1969-09-09 | 1970-03-11 | $7700.00 | Window Closed / Lapsed |