US3685965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Redox precipitation of nonferrous heavy metals from aqueous solution
Assignee: Aurubis AG
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Filing: 1969-12-01
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Granted: 1972-08-22
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Expires: 1989-12-01
Abstract
Abstract METALS SUCH AS MANGANESE AND COBALT ARE PRECIPIATED FROM AQUEOUS SOLUTION IN THE FORM OF THEIR HIGHER VALENCE HYDROXIDES, HYDRATED OXIDES OR OXIDES BY INTRODUCING INTO THE SOLUTION FREE-OXYGEN AND A REDUCING AGENT, ESPECIALLY SULFUR DIOXIDE OR A SULFITE, WHILE MAINTAINING THE PH OF THE SOLUTION BETWEEN THE PRECIPITATION PH OF THE LOWER VALENCE AND THAT OF THE HIGHER VALENCE PRECIPITATE.
Inventors
- 👤 Elmar Kniprath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:03
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/36; C01G; C01G45/00; C01G45/02; C01G45/024; C01G51/00; C01G51/05; C22; C22B; C22B3/00; C22B3/20; C22B3/44; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |