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Patent US2878102A successfully refreshed from Google Patents.
US2878102A
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US
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Recovery of metallic and non-metallic values from sulfide and sulfide-oxide ores
Assignee: Continental Ore Corp
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Filing: 1955-11-30
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Granted: 1959-03-17
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Expires: 1975-11-30
Abstract
No abstract record available.
Inventors
- 👤 Ernest A Sternfels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:23
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0026; C22B15/0028; C22B15/0052; C01; C01B; C01B17/00; C01B17/02; C01B17/06; C01B17/48; C01B17/50; C01B17/52; C22B1/00; C22B1/02; C22B15/0002; C22B15/001; C22B15/0013; C22B15/0015; C22B5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE RECOVERY TREATMENT OF SULPHIDE OR SULFIDEOXIDE ORES CONTINING SUBSTANTIAL AMOUNTS OF COPPER, SULFUR AND IRON, THE METHOD WHICH COMPRISES ROASTING THE ORE IN A REDUCING ATMOSPHERE TO FORM A CALCINE CONTAINING SUBSTANTIAL PORPORTIONS OF CUPROUS-SULPHIDE, PYRRHOTITE AND ELEMENTAL SULFUR, SUBJECTING THE CALCINE TO A PRIMARY FLOTATION STEP TO SEPARATE CUPROUS-SULFIDE AND SULFUR AS AN OVERFLOW FROM PYRRHOTITE AS AN UNDERFLOW, SUBJECTING SAID OVERFLOW TO A SECOND FLOTATION TO SEPARATE SULFUR FROM
Claim 2
Dependent Claim
73 words
IN THE RECOVERY TREATMENT OF SULPHIDE OR SULFIDEOXIDE ORES CONTINING SUBSTANTIAL AMOUNTS OF COPPER, SULFUR AND IRON, THE METHOD WHICH COMPRISES ROASTING THE ORE IN A REDUCING ATMOSPHERE TO FORM A CALCINE CONTAINING SUBSTANTIAL PORPORTIONS OF CUPROUS-SULPHIDE, PYRRHOTITE AND ELEMENTAL SULFUR, SUBJECTING THE CALCINE TO A PRIMARY FLOTATION STEP TO SEPARATE CUPROUS-SULFIDE AND SULFUR AS AN OVERFLOW FROM PYRRHOTITE AS AN UNDERFLOW, SUBJECTING SAID OVERFLOW TO A SECOND FLOTATION TO SEPARATE SULFUR FROM
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |