US2517051A
Expired / Lapsed
US
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Apparatus for conducting ion exchange operations
Assignee: Dorr Co
•
Filing: 1949-06-03
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Granted: 1950-08-01
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Expires: 1969-06-03
Abstract
No abstract record available.
Inventors
- 👤 Walter R Swenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:33
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/14; G05D16/18; B; B01; B01J; B01J47/00; B01J47/14; G05D7/00; G05D7/03; G05D9/00; G05D9/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2365; Y10T137/2931; Y10T137/3115; Y10T137/3127; Y10T137/7287; Y10T137/7313
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-31 | 1954-01-30 | 1954-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-31 | 1958-01-30 | 1958-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-31 | 1962-01-30 | 1962-08-01 | $7700.00 | Window Closed / Lapsed |