US3681055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper recovery process
Assignee: AMERICAN REFINING Ltd
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Filing: 1969-04-21
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Granted: 1972-08-01
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Expires: 1989-04-21
Abstract
Abstract COPPER VALUES ARE EXTRACTED FROM LOW GRADE MATERIALS WITH AN AMMONIACAL AQUEOUS SOLUTION OF AMMONIUM CARBONATE TO PRODUCE AN AQUEOUS SOLUTION OF COPPER AMMONIUM CARBONATE COMPLEX. THE SOLUTION IS TREATED BY ELETROYLSIS, EVAPORATION, OR MEATAL CATALYSIS TO DECOMPOSE THE COPPER AMMONIUM COMPLEX AND PRODUCE A COPPER CARBONATE PRECIPITATE. THE COPPER CARBONATE PRECIPITATE IS RECOVERED AND REDUCED TO METALLIC COPPER.
Inventors
- 👤 Paul A Little
- 👤 Lloyd B Lyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:38
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |