US3725047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of noble metals
Assignee: GIRDLER SUEDCHEMIE KATALYSATOR
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Filing: 1971-06-02
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Granted: 1973-04-03
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Expires: 1991-06-02
Abstract
Abstract NOBLE METALS, PARTICULARLY METALS OF THE PLATINUM GROUP AND GOLD ARE SEPARATED FROM OTHER MATERIALS IN AQUEOUS ACIDIC SOLUTION BY PRECIPITATION IN ELEMENTAL FORM BY REACTION WITH AN ALKENE OR OTHER COMPOUND CONTAINING A C-C DOUBLE BOND, IN THE PRESENCE OF AN OXIDIZING AGENT SUCH AS OXYGEN.
Inventors
- 👤 M Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:48
CPC Classifications
C; C01; C01G; C01G55/00; C01G55/001; C01G7/00; C01G7/003; C22; C22B; C22B3/00; C22B3/20; C22B3/26; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |