US2415936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionic exchange operations
Assignee: Dorr Co
•
Filing: 1944-01-22
•
Granted: 1947-02-18
•
Expires: 1964-01-22
Abstract
No abstract record available.
Inventors
- 👤 Peter M Contant
- 👤 Anthony J Fischer
- 👤 Wayne A Kivell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:30
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1255359A
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US1949044A
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US2003757A
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US2065962A
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US2217822A
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US2145820A
Cited
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Cited
US2182415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-17 | 1950-08-19 | 1951-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-17 | 1954-08-19 | 1955-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-17 | 1958-08-19 | 1959-02-18 | $7700.00 | Window Closed / Lapsed |