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US3218161A
Expired / Lapsed
US
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Process for the precipitation of metal values from solutions
Assignee: Viridian Inc Canada
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Filing: 1961-02-27
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Granted: 1965-11-16
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Expires: 1981-02-27
Abstract
No abstract record available.
Inventors
- 👤 Kunda Vasyl
- 👤 Pearce Reginald Francis
- 👤 Mackiw Vladimir Nicolaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:57
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0453; C22B23/0461; C22B3/00; C22B3/20; C22B3/44; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
THE METHOD OF SELECTIVELY PRECIPITATING VALUES OF AT LEAST ONE METAL SELECTED FROM A FIRST GROUP CONSISTING OF SILVER, COPPER, TUNGSTEN, BISMUTH, PLATINUM, CADMIUM, RHODIUM, MOLYBDENUM, TIN, VANADIUM, MERCURY, PALLADIUM, ARSENIC, LEAD AND ANTIMONY FROM AN AQUEOUS SULPHATE SOLUTION WHICH CONTAINS, IN SOLUTION, AT LEAST ONE OF SAID METALS AND AT LEAST ONE METAL OF A SECOND GROUP CONSISTING OF NICKEL AND COBALT WHICH COMPRISES THE STEPS OF REACTING SAID SOLUTION AT A PH WITHIN THE RANGE OF FROM ABOUT 1 TO ABOUT 7 WITH SULPHUR DIOXIDE AND FINELY DIVIDED PARTICLES OF ELEMENTAL SULPHUR, SAID ELEMENTAL SULPHUR PROVIDED IN AMOUNT IN EXCESS OF THE STOICHIOMETRIC EQUIVALENT OF SULPHUR REQUIRED TO COMBINE WITH SAID FIRST GROUP METAL VALUES IN SOLUTION TO FORM METAL SULPHIDES OF SAID FIRST GROUP, ACTIVELY AGITATING THE SOLUTION IN AN INERT ATMOSPHERE AT A TEMPERATURE ABOVE ABOUT 125*F., CONTINUING THE REACTION WITH SAID SULPHUR DIOXIDE AND FINELY DIVIDED PARTICLES OF ELEMENTAL SULPHUR TO FORM AND PRECIPITATE SAID METAL SULPHIDES AND SEPARATING THE PRECIPITATED METAL SULPHIDES FROM THE SOLUTION.
Claim 2
Independent Claim
171 words
THE METHOD OF SELECTIVELY PRECIPITATING VALUES OF AT LEAST ONE METAL SELECTED FROM A FIRST GROUP CONSISTING OF SILVER, COPPER, TUNGSTEN, BISMUTH, PLATINUM, CADMIUM, RHODIUM, MOLYBDENUM, TIN, VANADIUM, MERCURY, PALLADIUM, ARSENIC, LEAD AND ANTIMONY FROM AN AQUEOUS SULPHATE SOLUTION WHICH CONTAINS, IN SOLUTION, AT LEAST ONE OF SAID METALS AND AT LEAST ONE METAL OF A SECOND GROUP CONSISTING OF NICKEL AND COBALT WHICH COMPRISES THE STEPS OF REACTING SAID SOLUTION AT A PH WITHIN THE RANGE OF FROM ABOUT 1 TO ABOUT 7 WITH SULPHUR DIOXIDE AND FINELY DIVIDED PARTICLES OF ELEMENTAL SULPHUR, SAID ELEMENTAL SULPHUR PROVIDED IN AMOUNT IN EXCESS OF THE STOICHIOMETRIC EQUIVALENT OF SULPHUR REQUIRED TO COMBINE WITH SAID FIRST GROUP METAL VALUES IN SOLUTION TO FORM METAL SULPHIDES OF SAID FIRST GROUP, ACTIVELY AGITATING THE SOLUTION IN AN INERT ATMOSPHERE AT A TEMPERATURE ABOVE ABOUT 125*F., CONTINUING THE REACTION WITH SAID SULPHUR DIOXIDE AND FINELY DIVIDED PARTICLES OF ELEMENTAL SULPHUR TO FORM AND PRECIPITATE SAID METAL SULPHIDES AND SEPARATING THE PRECIPITATED METAL SULPHIDES FROM THE SOLUTION.
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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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |