Patent US1887138A successfully refreshed from Google Patents.
Patent US2529700A successfully refreshed from Google Patents.
US2529700A
Expired / Lapsed
US
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Method of electrolytically producing zinc of high purity
Assignee: Hudbay Minerals Inc
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Filing: 1946-08-01
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Granted: 1950-11-14
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Expires: 1966-08-01
Abstract
No abstract record available.
Inventors
- 👤 Lowe Sherwin Pope
- 👤 Long George William
- 👤 Downes Kenneth William
- 👤 Kent George Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:06
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
THE METHOD OF ELECTROLYTICALLY REFINING ZINC TO A HIGH PURITY FROM A ZINC SULPHATE ELECTROLYTE CONTAINING AT LEAST ONE OF THE IMPURITIES, LEAD, COPPER, CADMIUM AND IRON, TO REDUCE AT LEAST THE LEAD CONTENT OF THE ZINC DEPOSITED, WHICH COMPRISES ADJUSTING THE PH OF THE ELECTROLYTE TO A STATE OF SUBSTANTIAL EQUILIBRIUM NEUTRALITY, SAID NEUTRALITY BEING A PH OF ABOUT 5.1 TO 5.5, ADDING TO THE ELECTROLYTE A STABLE ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, ACCETALDEHYDE, PROPIONALEHYDE, N-BUTYRALDEHYDE, AND 2ETHYLBUTYRALDEHYDE, IN AN AMOUNT SUFFICIENT TO REDUCE THE AMOUNTS OF SAID IMPURITIES IN THE ZINC WHICH IS DEPOSITED BY AN AMOUNT GREATER THAN THE REDUCTION IN SUCH IMPURITIES INCIDENT TO ELECTROLYSIS IN THE ABSENCE OF SUCH ALDEHYDE, MEANWHILE MAINTAINING SAID ELECTROLYTE SUBSTANTIALLY FREE OF NITROGEN CONTAINING COMPOUNDS, AND PASSING ELECTRIC CURRENT FROM AN IMPURE ZINC ANODE CONTAINING AT LEAST ONE OF SAID IMPURITIES TO A CATHODE THROUGH SAID ELECTROLYTE CONTAINING SAID ALDEHYDE, TO DEPOSITE ZINC OF HIGH PURITY.
Claim 2
Independent Claim
159 words
THE METHOD OF ELECTROLYTICALLY REFINING ZINC TO A HIGH PURITY FROM A ZINC SULPHATE ELECTROLYTE CONTAINING AT LEAST ONE OF THE IMPURITIES, LEAD, COPPER, CADMIUM AND IRON, TO REDUCE AT LEAST THE LEAD CONTENT OF THE ZINC DEPOSITED, WHICH COMPRISES ADJUSTING THE PH OF THE ELECTROLYTE TO A STATE OF SUBSTANTIAL EQUILIBRIUM NEUTRALITY, SAID NEUTRALITY BEING A PH OF ABOUT 5.1 TO 5.5, ADDING TO THE ELECTROLYTE A STABLE ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, ACCETALDEHYDE, PROPIONALEHYDE, N-BUTYRALDEHYDE, AND 2ETHYLBUTYRALDEHYDE, IN AN AMOUNT SUFFICIENT TO REDUCE THE AMOUNTS OF SAID IMPURITIES IN THE ZINC WHICH IS DEPOSITED BY AN AMOUNT GREATER THAN THE REDUCTION IN SUCH IMPURITIES INCIDENT TO ELECTROLYSIS IN THE ABSENCE OF SUCH ALDEHYDE, MEANWHILE MAINTAINING SAID ELECTROLYTE SUBSTANTIALLY FREE OF NITROGEN CONTAINING COMPOUNDS, AND PASSING ELECTRIC CURRENT FROM AN IMPURE ZINC ANODE CONTAINING AT LEAST ONE OF SAID IMPURITIES TO A CATHODE THROUGH SAID ELECTROLYTE CONTAINING SAID ALDEHYDE, TO DEPOSITE ZINC OF HIGH PURITY.
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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) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |