Patent US31809A successfully refreshed from Google Patents.
US31809A
Expired / Lapsed
US
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Improvement in fire-arms
Assignee: —
•
Filing: —
•
Granted: 1861-03-26
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Expires: 1878-03-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:34
CPC Classifications
F; F41; F41A; F41A5/00; F41A5/02; F41A5/16
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) | 1864-03-25 | 1864-09-24 | 1865-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1868-03-25 | 1868-09-24 | 1869-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1872-03-25 | 1872-09-24 | 1873-03-26 | $7700.00 | Window Closed / Lapsed |