US2647832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of pure copper metal from copper-bearing scrap
Assignee: Chemical Construction Corp
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Filing: 1950-06-01
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Granted: 1953-08-04
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Expires: 1970-06-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Louis N Allen
- 👤 Patrick J Mcgauley
- 👤 Edward S Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:58
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; C22B15/0084; C22B15/0089; C22B15/0093; C22B15/0065; C22B15/0078; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
IN A PROCESS FOR RECOVERING COPPER METAL FROM COPPER-BEARING MATERIAL IN WHICH SAID MATERIAL IS LEACHED WITH AN AQUEOUS AMMONIACAL SOLUTION OF A COPPER SALT AND COPPER IS CHEMICALLY PRECIPITATED FROM LEACH LIQUOR BY THE TREATMENT WITH A REDUCING GAS; THE IMPROVEMENT WHICH COMPRISES: WITHDRAWING LEACH SOLUTION, FROM SUCH TREATMENT, TREATING WITHDRAWN SOLUTION, AT A TEMPERATURE NOT GREATER THAN 125* F., WITH CARBON MONOXIDE IN AN AMOUNT SUFFICIENT TO DISSOLVE THEREIN A QUANTITY EQUIVALENT TO AT LEAST A MAJOR PORTION OF THE COPPER CONTENT OF THE WITHDRAWN LIQUOR, AND HEATING RESULTANT SOLUTION TO ABOVE ABOUT 150* F. UNDER EQUIVALENT PRESSURE FOR SUFFICIENT TIME ONLY TO REDUCE AND PRECIPITATE COPPER IN METALLIC FORM THEREFROM IN AMOUNT NOT EXCEEDING THAT WHICH IS AT LEAST 99.9% PURE.
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) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |