US2843538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic process for leaching precious metals
Assignee: Individual
•
Filing: 1954-10-01
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Granted: 1958-07-15
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Expires: 1974-10-01
Abstract
No abstract record available.
Inventors
- 👤 Haugen Ole Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:06
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN A PROCESS FOR THE RECOVERY OF PRECIOUS METALS, ESPECIALLY GOLD AND SILVER, BY THE CYANIDE-LEACHING PROCESS, THAT IMPROVEMENT IN LEACHING THE PRECIOUS METAL-CONTAINING STARTING MATERIAL IN A FINE STATE OF SUBDIVISION COM PRISING THE FOLLOWING STEPS: EXPOSING THE STARTING MATERIAL TO A SOLUTION CONTAINING ABOUT 10,000 GRAMS OF AN ALKALI METAL CYANIDE, 150 GRAMS OF AN ALKALI METAL HYDROXIDE AND 250 GRAMS OF SLAKED LIME PRE CUBIC METER OF SAID SOLUTION, IN THE PRESENCE OF OXYGEN, THE RATIO OF STARTING MATERIAL TO SAID SOLUTION BEING ABOUT BETWEEN 1.5 TO 1 TO ABOUT 4 TO 1 AND SIMULTANEOUSLY PASSING DIRECT ELECTRIC CURRENT AT A CONSTANT VOLTAGE OF FROM 6 TO 8 VOLTS THROUGH SAID SOLUTION FOR A PERIOD OF ABOUT 4 TO 8 HOURS WITH A CURRENT CONSUMPTION OF ABOUT 1 TO 2 AMPERES PER TON OF DRY STARTING MATERIAL, WHEREBY SAID STARTING MATERIAL IS LEACHED OF ITS PRECIOUS METAL-CONTAINING VALUES IN ACCORDANCE WITH THE EQUATION BELOW, EXEMPLIFIED BY GOLD:
Claim 2
Dependent Claim
160 words
IN A PROCESS FOR THE RECOVERY OF PRECIOUS METALS, ESPECIALLY GOLD AND SILVER, BY THE CYANIDE-LEACHING PROCESS, THAT IMPROVEMENT IN LEACHING THE PRECIOUS METAL-CONTAINING STARTING MATERIAL IN A FINE STATE OF SUBDIVISION COM PRISING THE FOLLOWING STEPS: EXPOSING THE STARTING MATERIAL TO A SOLUTION CONTAINING ABOUT 10,000 GRAMS OF AN ALKALI METAL CYANIDE, 150 GRAMS OF AN ALKALI METAL HYDROXIDE AND 250 GRAMS OF SLAKED LIME PRE CUBIC METER OF SAID SOLUTION, IN THE PRESENCE OF OXYGEN, THE RATIO OF STARTING MATERIAL TO SAID SOLUTION BEING ABOUT BETWEEN 1.5 TO 1 TO ABOUT 4 TO 1 AND SIMULTANEOUSLY PASSING DIRECT ELECTRIC CURRENT AT A CONSTANT VOLTAGE OF FROM 6 TO 8 VOLTS THROUGH SAID SOLUTION FOR A PERIOD OF ABOUT 4 TO 8 HOURS WITH A CURRENT CONSUMPTION OF ABOUT 1 TO 2 AMPERES PER TON OF DRY STARTING MATERIAL, WHEREBY SAID STARTING MATERIAL IS LEACHED OF ITS PRECIOUS METAL-CONTAINING VALUES IN ACCORDANCE WITH THE EQUATION BELOW, EXEMPLIFIED BY GOLD:
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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |