US2417440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of guanidine salts
Assignee: Wyeth Holdings LLC
•
Filing: 1943-07-03
•
Granted: 1947-03-18
•
Expires: 1963-07-03
Abstract
No abstract record available.
Inventors
- 👤 Joseph H Paden
- 👤 Alexander F Maclean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:09
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1441206A
Cited
US2109934A
Cited
US2114280A
Cited
US2230827A
Cited
US2221478A
Cited
US2252400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-17 | 1950-09-16 | 1951-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-17 | 1954-09-16 | 1955-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-17 | 1958-09-16 | 1959-03-18 | $7700.00 | Window Closed / Lapsed |