US2469684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anion active resins and processes of producing the same
Assignee: Wyeth Holdings LLC
•
Filing: 1946-03-16
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Granted: 1949-05-10
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Expires: 1966-03-16
Abstract
No abstract record available.
Inventors
- 👤 James R Dudley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:17
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/13; Y; Y10; Y10S; Y10S71/00; Y10S71/904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1977253A
Cited
FR771836A
Cited
US2136928A
Cited
US2228514A
Cited
US2259169A
Cited
US2388235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-09 | 1952-11-08 | 1953-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-09 | 1956-11-08 | 1957-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-09 | 1960-11-08 | 1961-05-10 | $7700.00 | Window Closed / Lapsed |