US2796342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering copper by chemical precipitation
Assignee: Chemical Construction Corp
•
Filing: 1954-01-28
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Granted: 1957-06-18
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Expires: 1974-01-28
Abstract
No abstract record available.
Inventors
- 👤 Felix A Schaufelberger
- 👤 Patrick J Mcgauley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:39
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0453; C22B23/0461; C22B15/00; C22B15/0063; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
IN SEPARATELY RECOVERING COPPER BY CHEMICAL PRECIPITATION FROM A CLARIFIED AQUEOUS SULFATE SOLUTION CONTAINING SALTS OF COPPER AND AT LEAST ONE OTHER METAL SELECTED FROM NICKEL AND COBALT, THE IMPROVEMENT WHICH COMPRISES: ADJUSTING THE INITIAL HYDROGEN ION CONCENTRATION OF THE SOLUTION TO A VALUE LESS THAN EQUIVALENT TO ABOUT A 20% FREE SULFURIC ACID CONTENT BUT AT LEAST THAT EQUIVALENT TO A FREE SULFURIC ACID CONTENT OF ABOUT 5 GRAMS PER LITER IN THE PRESENCE OF COBALT AND AT LEAST ABOUT 24 GRAMS PER LITER IN THE PRESENCE OF NICKEL; TREATING THE ADJUSTED SOLUTION AT A TEMPERATURE OF ABOVE ABOUT 275*F. WITH A NON-SULFIDIZING REDUCING GAS WHILE MAINTAINING A FINITE PRESSURE OF REDUCING GAS AND A TOTAL PRESSURE SUFFICIENT TO PREVENT BOILING; AND COLLECTING PRECIPITATED COPPER METAL POWDER.
Claim 2
Dependent Claim
128 words
IN SEPARATELY RECOVERING COPPER BY CHEMICAL PRECIPITATION FROM A CLARIFIED AQUEOUS SULFATE SOLUTION CONTAINING SALTS OF COPPER AND AT LEAST ONE OTHER METAL SELECTED FROM NICKEL AND COBALT, THE IMPROVEMENT WHICH COMPRISES: ADJUSTING THE INITIAL HYDROGEN ION CONCENTRATION OF THE SOLUTION TO A VALUE LESS THAN EQUIVALENT TO ABOUT A 20% FREE SULFURIC ACID CONTENT BUT AT LEAST THAT EQUIVALENT TO A FREE SULFURIC ACID CONTENT OF ABOUT 5 GRAMS PER LITER IN THE PRESENCE OF COBALT AND AT LEAST ABOUT 24 GRAMS PER LITER IN THE PRESENCE OF NICKEL; TREATING THE ADJUSTED SOLUTION AT A TEMPERATURE OF ABOVE ABOUT 275*F. WITH A NON-SULFIDIZING REDUCING GAS WHILE MAINTAINING A FINITE PRESSURE OF REDUCING GAS AND A TOTAL PRESSURE SUFFICIENT TO PREVENT BOILING; AND COLLECTING PRECIPITATED COPPER METAL POWDER.
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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) | 1960-06-17 | 1960-12-17 | 1961-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-17 | 1964-12-17 | 1965-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-17 | 1968-12-17 | 1969-06-18 | $7700.00 | Window Closed / Lapsed |