Patent US5485841A successfully refreshed from Google Patents.
US51401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in the manufacture of malleable iron and steel
Assignee: —
•
Filing: —
•
Granted: 1865-12-05
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Expires: 1882-12-05
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:35
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02
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) | 1868-12-04 | 1869-06-05 | 1869-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1872-12-04 | 1873-06-05 | 1873-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1876-12-04 | 1877-06-05 | 1877-12-05 | $7700.00 | Window Closed / Lapsed |