US212508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in furnaces for roasting ores
Assignee: —
•
Filing: —
•
Granted: 1879-02-18
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Expires: 1896-02-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:00
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1836; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00265; B01J2208/00274; B01J2208/00327; B01J2208/00336; B01J2208/00353; B01J2208/00371; B01J2208/00504
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) | 1882-02-17 | 1882-08-19 | 1883-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1886-02-17 | 1886-08-19 | 1887-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1890-02-17 | 1890-08-19 | 1891-02-18 | $7700.00 | Window Closed / Lapsed |