Patent US2406127A successfully refreshed from Google Patents.
US57969A
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US
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Improvement in reducing metallic oxides and in refining the metal resulting therefrom
Assignee: —
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Filing: —
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Granted: 1866-09-11
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Expires: 1883-09-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:31
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0006
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) | 1869-09-10 | 1870-03-12 | 1870-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1873-09-10 | 1874-03-12 | 1874-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1877-09-10 | 1878-03-12 | 1878-09-11 | $7700.00 | Window Closed / Lapsed |