US2413784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionic exchange operations
Assignee: Dorr Co
•
Filing: 1943-12-04
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Granted: 1947-01-07
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Expires: 1963-12-04
Abstract
No abstract record available.
Inventors
- 👤 Franklin N Rawlings
- 👤 Geofroy Louis De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:48
CPC Classifications
C; C13; C13B; C13B20/00; C13B20/14; C13B20/144; B; B01; B01J; B01J47/00; B01J47/02; B01J47/026; B01J49/00; B01J49/05; B01J49/06; B01J49/50; B01J49/53
Claims Analysis
Total Claims: 0
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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) | 1950-01-06 | 1950-07-08 | 1951-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-01-06 | 1954-07-08 | 1955-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-01-06 | 1958-07-08 | 1959-01-07 | $7700.00 | Window Closed / Lapsed |