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US2573785A
Expired / Lapsed
US
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Apparatus for roasting sulfide ores
Assignee: Tennessee Copper Co
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Filing: 1947-03-17
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Granted: 1951-11-06
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Expires: 1967-03-17
Abstract
No abstract record available.
Inventors
- 👤 Leon W Booton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:46
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C22B1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1929713A
Cited
US2086232A
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US1963282A
Cited
US2070237A
Cited
US2120474A
Cited
US2210479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-05 | 1955-05-07 | 1955-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-05 | 1959-05-07 | 1959-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-05 | 1963-05-07 | 1963-11-06 | $7700.00 | Window Closed / Lapsed |