Patent US4725504A successfully refreshed from Google Patents.
US8599A
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US
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Improvement in processes for smelting copper ores
Assignee: —
•
Filing: —
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Granted: 1851-12-16
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Expires: 1868-12-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:54
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/36; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12181
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) | 1854-12-15 | 1855-06-16 | 1855-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1858-12-15 | 1859-06-16 | 1859-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1862-12-15 | 1863-06-16 | 1863-12-16 | $7700.00 | Window Closed / Lapsed |