Patent US2839387A successfully refreshed from Google Patents.
US2839387A
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Method for the cyanidation of precious metals
Assignee: Mining Corp of Canada Ltd
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Filing: 1954-05-28
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Granted: 1958-06-17
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Expires: 1974-05-28
Abstract
No abstract record available.
Inventors
- 👤 Burton Reginald William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:13
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE CYANDIDATION OF PRECIOUS METALS, THE IMPROVEMENT WHICH CONSISTS IN DISSOLVING A METAL SELECTED FROM THE GROUP CONSISTING OF GOLD AND SILVER IN THE PRESENCE OF A SMALL AMOUNT, OF THE ORDER OF A FEW POUNDS PER TON OF CYANIDE SOLUTION, OF A POLYAMINE SELECTED FROM THE GROUP CONSISTING OF DIETHYLENE TRIAMINE, TRIETHYLENE TETRAMINE, AND TETRAETHYLENE PENTAMINE, WHILE MAINTAINING THE CONCENTRATION OF CALCIUM HYDROXIDE BELOW ABOUT 0.1 POUND PER TON OF SOLUTION.
Claim 2
Dependent Claim
73 words
IN THE CYANDIDATION OF PRECIOUS METALS, THE IMPROVEMENT WHICH CONSISTS IN DISSOLVING A METAL SELECTED FROM THE GROUP CONSISTING OF GOLD AND SILVER IN THE PRESENCE OF A SMALL AMOUNT, OF THE ORDER OF A FEW POUNDS PER TON OF CYANIDE SOLUTION, OF A POLYAMINE SELECTED FROM THE GROUP CONSISTING OF DIETHYLENE TRIAMINE, TRIETHYLENE TETRAMINE, AND TETRAETHYLENE PENTAMINE, WHILE MAINTAINING THE CONCENTRATION OF CALCIUM HYDROXIDE BELOW ABOUT 0.1 POUND PER TON OF SOLUTION.
References Cited (Backward Citations)
US799548A
Cited
US1136872A
Cited
US2267205A
Cited
US2234140A
Cited
US2220212A
Cited
US2389878A
Cited
US2648601A
Cited
US2729557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |