US2208173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for effecting anion exchange
Assignee: CHARLES H LEWIS
•
Filing: 1939-04-05
•
Granted: 1940-07-16
•
Expires: 1959-04-05
Abstract
No abstract record available.
Inventors
- 👤 Oliver M Urbain
- 👤 William R Stemen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:22
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/12; B01J41/00; B01J41/02; B01J41/08; B01J41/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-07-16 | 1944-01-15 | 1944-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-07-16 | 1948-01-15 | 1948-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-07-16 | 1952-01-15 | 1952-07-16 | $7700.00 | Window Closed / Lapsed |