Patent US1862741A successfully refreshed from Google Patents.
US1862741A
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US
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Smelting of metalliferous material
Assignee: BRADEN COPPER Co
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Filing: 1929-12-18
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Granted: 1932-06-14
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Expires: 1949-12-18
Abstract
No abstract record available.
Inventors
- 👤 Engblom Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:06
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0026; C22B15/0028; C22B15/003; C22B15/0041; F; F27; F27B; F27B3/00
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) | 1935-06-14 | 1935-12-14 | 1936-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-06-14 | 1939-12-14 | 1940-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-06-14 | 1943-12-14 | 1944-06-14 | $7700.00 | Window Closed / Lapsed |