US2754261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of ion-exchange material
Assignee: Permutit Co Ltd
•
Filing: 1952-04-04
•
Granted: 1956-07-10
•
Expires: 1972-04-04
Abstract
No abstract record available.
Inventors
- 👤 Akeroyd Ewart Ingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:05
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1510469A
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US1485334A
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US1947248A
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US2157511A
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GB592767A
Cited
US2599558A
Cited
US2631127A
Cited
US2664396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |