US2469472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cation exchange materials
Assignee: Permutit Co
•
Filing: 1944-03-15
•
Granted: 1949-05-10
•
Expires: 1964-03-15
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Nachod
- 👤 Wood William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:44
CPC Classifications
C; C08; C08L; C08L45/00; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19; B01J39/20; C08F; C08F8/00; C08F8/34; C08F2800/00; C08F2800/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB117016A
Cited
US1263813A
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GB172048A
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FR816448A
Cited
US2067073A
Cited
US2226134A
Cited
US2198378A
Cited
US2255409A
Cited
US2235971A
Cited
US2209317A
Cited
US2340110A
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 |