Patent US3112174A successfully refreshed from Google Patents.
US3112174A
Expired / Lapsed
US
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Process for producing gold cyanide solutions of high gold content
Assignee: Trifari Krussman and Fishel Inc
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Filing: 1961-09-19
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Granted: 1963-11-26
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Expires: 1981-09-19
Abstract
No abstract record available.
Inventors
- 👤 Freedman Emiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:40
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
METHOD FOR REDUCING AN ALKALI METAL AURIC CYANIDE TO THE CORRESPONDING ALKALI METAL AURO CYANIDE IN AQUEOUS SOLUTION, WITHOUT REDUCTION OF GOD TO METALLIC FORM, WHICH COMPRISES REACTING CUPROUS CYANIDE WITH THE ALKALI METAL AURIC CYANIDE, WHILE THE LATTER IS IN CLEAR, ALKALINE, AQUEOUS SOLUTION WHICH IS SUBSTANTIALLY FREE FROM OXIDIZING AGENTS AND WHICH CONTAINS AN EXCESS OF THE CORRESPONDING ALKALI METAL CYANIDE, BY MIXING TEH CUPROUS CYANIDE WITH THE AQUEOUS SOLUTION OF THE ALKALI METAL AURIC CYANIDE IN A PROPORTION NOT LESS ABOUT 1% AND NOT EXCEEDING ABOUT 50% BY WEIGHT OF THE GOLD IN THE 3-VALENCE STATE PRESENT IN THE SOLUTION, AND HEATING THE RESULTANT MIXTURE FOR SEVERALHOURS, THEREBY REDUCING THE GOLD IN THE 3-VALENCE STATE SUBSTANTIALLY COMPLETELY TO GOLD IN THE 1-VALENCE STATE.
Claim 2
Dependent Claim
126 words
METHOD FOR REDUCING AN ALKALI METAL AURIC CYANIDE TO THE CORRESPONDING ALKALI METAL AURO CYANIDE IN AQUEOUS SOLUTION, WITHOUT REDUCTION OF GOD TO METALLIC FORM, WHICH COMPRISES REACTING CUPROUS CYANIDE WITH THE ALKALI METAL AURIC CYANIDE, WHILE THE LATTER IS IN CLEAR, ALKALINE, AQUEOUS SOLUTION WHICH IS SUBSTANTIALLY FREE FROM OXIDIZING AGENTS AND WHICH CONTAINS AN EXCESS OF THE CORRESPONDING ALKALI METAL CYANIDE, BY MIXING TEH CUPROUS CYANIDE WITH THE AQUEOUS SOLUTION OF THE ALKALI METAL AURIC CYANIDE IN A PROPORTION NOT LESS ABOUT 1% AND NOT EXCEEDING ABOUT 50% BY WEIGHT OF THE GOLD IN THE 3-VALENCE STATE PRESENT IN THE SOLUTION, AND HEATING THE RESULTANT MIXTURE FOR SEVERALHOURS, THEREBY REDUCING THE GOLD IN THE 3-VALENCE STATE SUBSTANTIALLY COMPLETELY TO GOLD IN THE 1-VALENCE STATE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-11-25 | 1967-05-27 | 1967-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-25 | 1971-05-27 | 1971-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-25 | 1975-05-27 | 1975-11-26 | $7700.00 | Window Closed / Lapsed |