US3271136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gold recovery process using an alkali metal hydrosulfite with a water soluble alkalimetal alkanoate
Assignee: Individual
•
Filing: 1964-07-08
•
Granted: 1966-09-06
•
Expires: 1984-07-08
Abstract
No abstract record available.
Inventors
- 👤 Davidoff Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:02
CPC Classifications
C; C01; C01G; C01G7/00; C01G7/003; C22; C22B; C22B11/00; C22B11/08; C22B3/00; C22B3/20; C22B3/26; C22B3/32; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD OF RECOVERING GOLD FROM AN AQUEOUS SOLUTION OF ALKALI METAL GOLD CYANIDE COMPRISING ADDING TO THE SOLUTION AN ALKALI METAL HYDROSULFITE IN A MOLAR AMOUNT AT LESR EQUIVALENT TO THE GOLD IN SAID SOLUTION AND ABOUT 0.2 TO 20 PARTS OF A WATER SOLUBLE ALKALI METAL ALKANOATE PER PART BY WEIGHT OF THE HYDROSULFITE, MAINTAINING THE RESULTING SOLUTIONAT AN ELEVATED TEMPERATURE ABOVE ABOUT 150*F. UNTIL CESSATION OF PRECIPITATION OF THE GOLD, AND REMOVING THE PRECIPITATED GOLD FROM THE SOLUTION.
Claim 2
Independent Claim
81 words
A METHOD OF RECOVERING GOLD FROM AN AQUEOUS SOLUTION OF ALKALI METAL GOLD CYANIDE COMPRISING ADDING TO THE SOLUTION AN ALKALI METAL HYDROSULFITE IN A MOLAR AMOUNT AT LESR EQUIVALENT TO THE GOLD IN SAID SOLUTION AND ABOUT 0.2 TO 20 PARTS OF A WATER SOLUBLE ALKALI METAL ALKANOATE PER PART BY WEIGHT OF THE HYDROSULFITE, MAINTAINING THE RESULTING SOLUTIONAT AN ELEVATED TEMPERATURE ABOVE ABOUT 150*F. UNTIL CESSATION OF PRECIPITATION OF THE GOLD, AND REMOVING THE PRECIPITATED GOLD FROM THE SOLUTION.
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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |