Patent US2458893A successfully refreshed from Google Patents.
US2458893A
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Apparatus for conducting ion exchange operations
Assignee: Dorr Co
•
Filing: 1945-10-06
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Granted: 1949-01-11
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Expires: 1965-10-06
Abstract
No abstract record available.
Inventors
- 👤 Robert C Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:12
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US548458A
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US1698002A
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US1892951A
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US2056420A
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US2048158A
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US2248322A
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US2376912A
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US2365221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-11 | 1952-07-12 | 1953-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-11 | 1956-07-12 | 1957-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-11 | 1960-07-12 | 1961-01-11 | $7700.00 | Window Closed / Lapsed |