Patent US2784081A successfully refreshed from Google Patents.
US2784081A
Expired / Lapsed
US
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Ore smelting processes
Assignee: Individual
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Filing: 1953-10-20
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Granted: 1957-03-05
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Expires: 1973-10-20
Abstract
No abstract record available.
Inventors
- 👤 William E Greenawalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:03
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0026; C22B15/0028; C22B15/0047; C22B15/005
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
AN ORE SMELTING PROCESS COMPRISING, TREATING FINELY DIVIDED SULPHIDE COPPER ORE TO PRODUCE SAND AND SLIME CONCENTRATES, SHOWERING THE SAND CONCENTRATE THROUGH THE HIGHLY HEATED ATMOSPHERE OF A MELTING FURNACE TO MELT IT, SEPARATING THE RESULTING MOLTEN SAND CONCENTRATE FROM THE HOT MELTING FURNACE GAS, MIXING THE RAW SLIME CONCENTRATE WITH THE MOLTEN SAND CONCENTRATE, AND SMELTING THE MOLTEN MIXTURE OF SAND AND SLIME CONCENTRATE SEPARATED FROM THE MELTING FURNACE GAS TO SEPARATE THE RESULTING COPPER MATTE FROM THE MOLTEN ORE SLAG.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |