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Patent US21964A successfully refreshed from Google Patents.
US21964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering-cock
Assignee: —
•
Filing: —
•
Granted: 1858-11-02
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Expires: 1875-11-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:15
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/02; B01D35/04
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) | 1861-11-01 | 1862-05-03 | 1862-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1865-11-01 | 1866-05-03 | 1866-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1869-11-01 | 1870-05-03 | 1870-11-02 | $7700.00 | Window Closed / Lapsed |