Patent US2458115A successfully refreshed from Google Patents.
US2458115A
Expired / Lapsed
US
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Control of ion exchange systems
Assignee: Dorr Co
•
Filing: 1947-08-02
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Granted: 1949-01-04
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Expires: 1967-08-02
Abstract
No abstract record available.
Inventors
- 👤 Walter R Swenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:31
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/14; B01J47/10; B01J47/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1495317A
Cited
US1362673A
Cited
US1759636A
Cited
US2365221A
Cited
US2404367A
Cited
US2422821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |