US3834896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of gold
Assignee: United States Department of the Interior
•
Filing: 1972-06-21
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Granted: 1974-09-10
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Expires: 1992-06-21
Abstract
Abstract GOLD IS RECOVERED FROM ITS ORES BY TREATING THE ORES AT ELEVATED TEMPERATURE WITH GASEOUS CHLORINE IN THE PRESENCE OF (1) A PROMOTER COMPRISING A COMPOUND OF IRON, ALUMINUM OR GALLIUM AND (2) ACTIVATED CARBON, WHEREBY THE COMPLEX AUMECL6, WHERE ME IS IRON, ALUMINUM OR GALLIUM, IS FORMED AND IS ADSORBED ON THE ACTIVATED CARBON. THE GOLD-LADEN ACTIVATED CARBON IS THEN SEPARATED FROM THE GANGUE BY FROTH FLOTATION AND THE GOLD RECOVERED FROM THE CARBON BY CONVENTIONAL MEANS.
Inventors
- 👤 J Eisele
- 👤 H Heinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:41
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/06; C22B3/00; C22B3/20; C22B3/22; C22B3/24; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |