US184920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in water-filters
Assignee: —
•
Filing: —
•
Granted: 1876-11-28
•
Expires: 1893-11-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:03
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; B; B01; B01D; B01D24/00; B01D24/02; B01D24/10; C02F2307/00; C02F2307/06
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) | 1879-11-28 | 1880-05-29 | 1880-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1883-11-28 | 1884-05-29 | 1884-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1887-11-28 | 1888-05-29 | 1888-11-28 | $7700.00 | Window Closed / Lapsed |