US2874847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange device and method
Assignee: Whirlpool Corp
•
Filing: 1955-08-11
•
Granted: 1959-02-24
•
Expires: 1975-08-11
Abstract
No abstract record available.
Inventors
- 👤 William J Diamond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:54
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/02; B01J47/022; C; C02; C02F; C02F1/00; C02F1/42
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |