Patent US2709076A successfully refreshed from Google Patents.
US2807533A
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US
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Silver recovery method
Assignee: Calumet and Hecla Inc
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Filing: 1956-05-21
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Granted: 1957-09-24
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Expires: 1976-05-21
Abstract
No abstract record available.
Inventors
- 👤 Helmer A Abramson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:33
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/04; C22B15/00; C22B15/0063; C22B3/00; C22B3/04; C22B3/12; C22B3/14; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR RECOVERY OF COPPER AND SILVER VALUES FROM FINELY DIVIDED COPPER SULFIDE ORE CONCENTRATE CONTAINING NATIVE SILVER, SAID PROCESS COMPRISING THE STEPS OF CONTACTING SAID CONCENTRATE WITH A SOLUTION OF AQUEOUS, AMMONIACAL, AMMONIUM CARBONATE LEACH SOLUTION SUBSTANTIALLY FREE FROM ADDED FROTH DEPRESSANT AND SUBSTANTIALLY FREE FROM ADDED FROTHING AGENT, MAINTAINING SAID ORE IN SUSPENSION IN SAID SOLUTION WHILE PASSING AN OXYGEN-CONTAINING GAS THERETHROUGH WHEREBY TO DISSOLVE COPPER VALUES FROM SAID ORE AND AT THE SAME TIME FORM A FROTH RICH IN SILVER IN THE FORM OF SOLID PARTICLES, COLLECTING AND REMOVING SAID FROTH WITH ITS SOLID SILVER CONTENT AND RECOVERING COPPER AND SILVER VALUES THEREFROM AND RECOVERING COPPER VALUES FROM SAID SOLUTION.
Claim 2
Dependent Claim
114 words
A PROCESS FOR RECOVERY OF COPPER AND SILVER VALUES FROM FINELY DIVIDED COPPER SULFIDE ORE CONCENTRATE CONTAINING NATIVE SILVER, SAID PROCESS COMPRISING THE STEPS OF CONTACTING SAID CONCENTRATE WITH A SOLUTION OF AQUEOUS, AMMONIACAL, AMMONIUM CARBONATE LEACH SOLUTION SUBSTANTIALLY FREE FROM ADDED FROTH DEPRESSANT AND SUBSTANTIALLY FREE FROM ADDED FROTHING AGENT, MAINTAINING SAID ORE IN SUSPENSION IN SAID SOLUTION WHILE PASSING AN OXYGEN-CONTAINING GAS THERETHROUGH WHEREBY TO DISSOLVE COPPER VALUES FROM SAID ORE AND AT THE SAME TIME FORM A FROTH RICH IN SILVER IN THE FORM OF SOLID PARTICLES, COLLECTING AND REMOVING SAID FROTH WITH ITS SOLID SILVER CONTENT AND RECOVERING COPPER AND SILVER VALUES THEREFROM AND RECOVERING COPPER VALUES FROM SAID SOLUTION.
References Cited (Backward Citations)
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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) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |