US3137649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of sulfide ores
Assignee: Shell USA Inc
•
Filing: 1962-02-09
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Granted: 1964-06-16
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Expires: 1982-02-09
Abstract
No abstract record available.
Inventors
- 👤 Benedictis Aldo De
- 👤 Gerald J Hills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:19
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D1/002; B03D2201/00; B03D2201/06; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN A PROCESS FOR THE SEPARATION OF A FIRST SULFIDE MINERAL CONCENTRAGE OBTAINED BY FROTH FLOTATION IN THE PRESENCE OF AN ORGANIC COLLECTOR AND WHICH CONTAINS SAID FIRST SULFIDE MINERAL TOGETHER WITH A SECOND SULFIDE MINERAL WHICH IS DEPRESSED BY CYANIDE DEPRESSANTS, THE IMPROVED METHOD FOR RECOVERING SAID FIRST SULFIDE MINERAL IN MORE CONCENTRATED FORM WHICH COMRRISES: ADJUSTING THE PH OF SAID CONCENTRATE TO A VALUE NOT GREATER THAN 7, ADDING TO THE NONBASIC CONCENTRATE A SMALL AMOUNT OF HYDROGEN PEROXIDE, THAN AFTER AN INTERVAL OF 1 TO 10 MINUTES, ADDING SAID CYANIDE DEPRESSANT, SUBJECTING THE MIIXTURE TO DIFFERENTIAL FROTH FLOTATION, AND TAKING OFF SAID FIRST SULFIDE MINERAL AS FLOAT FROM TAILINGS CONTAINED SAID SECOND SULFIDE MINERAL.
Claim 2
Dependent Claim
117 words
IN A PROCESS FOR THE SEPARATION OF A FIRST SULFIDE MINERAL CONCENTRAGE OBTAINED BY FROTH FLOTATION IN THE PRESENCE OF AN ORGANIC COLLECTOR AND WHICH CONTAINS SAID FIRST SULFIDE MINERAL TOGETHER WITH A SECOND SULFIDE MINERAL WHICH IS DEPRESSED BY CYANIDE DEPRESSANTS, THE IMPROVED METHOD FOR RECOVERING SAID FIRST SULFIDE MINERAL IN MORE CONCENTRATED FORM WHICH COMRRISES: ADJUSTING THE PH OF SAID CONCENTRATE TO A VALUE NOT GREATER THAN 7, ADDING TO THE NONBASIC CONCENTRATE A SMALL AMOUNT OF HYDROGEN PEROXIDE, THAN AFTER AN INTERVAL OF 1 TO 10 MINUTES, ADDING SAID CYANIDE DEPRESSANT, SUBJECTING THE MIIXTURE TO DIFFERENTIAL FROTH FLOTATION, AND TAKING OFF SAID FIRST SULFIDE MINERAL AS FLOAT FROM TAILINGS CONTAINED SAID SECOND SULFIDE MINERAL.
References Cited (Backward Citations)
CA572011A
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US1552937A
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US1950537A
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US2399845A
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US2559104A
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US2664199A
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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) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |