US2277091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for purification of liquids by electro-osmosis
Assignee: Individual
•
Filing: 1937-12-15
•
Granted: 1942-03-24
•
Expires: 1957-12-15
Abstract
No abstract record available.
Inventors
- 👤 Feyens Alfred Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:27
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; A; A47; A47L; A47L15/00; A47L15/26; A47L15/28; C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C25; C25B; C25B9/00; C25B9/17; G; G01; G01R; G01R13/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1945-03-23 | 1945-09-22 | 1946-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-03-23 | 1949-09-22 | 1950-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-03-23 | 1953-09-22 | 1954-03-24 | $7700.00 | Window Closed / Lapsed |