Patent US2647820A successfully refreshed from Google Patents.
US2647820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering nickel and/or cobalt ammonium sulfate from solutions containing nickel and/or cobalt values
Assignee: Viridian Inc Canada
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Filing: 1951-07-16
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Granted: 1953-08-04
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Expires: 1971-07-16
Abstract
No abstract record available.
Inventors
- 👤 Forward Frank Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:40
CPC Classifications
C; C01; C01G; C01G53/00; C01G53/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
THE METHOD OF TREATING AN AMMONIACAL SOLUTION CONTAINING METAL VALUES SELECTED FROM THE GROUP CONSISTING OF NICKLE AND COBALT VALUES WHICH COMPRISES THE STEPS OF ADJUSTING THE PH VALUES OF THE SOLUTION TO WITHIN THE RANGE OF FROM ABOUT PH 8 TO ABOUT PH 7.1, ADDING SULPHURIC ACID TO THE SOLUTION TO REDUCE THE PH VALUE OF THE SOLUTION OF AT LEAST ABOUT PH 4 TO CONVERT SAID METAL VALUES TO SAID PRECIPITATE THEM FROM SAID SOLUTION AS METAL AMMONIUM SULPHATES, AND SEPARATING PRECIPITATED METAL AMMONIUM SULPHATES FROM SAID SOLUTION.
Claim 2
Independent Claim
90 words
THE METHOD OF TREATING AN AMMONIACAL SOLUTION CONTAINING METAL VALUES SELECTED FROM THE GROUP CONSISTING OF NICKLE AND COBALT VALUES WHICH COMPRISES THE STEPS OF ADJUSTING THE PH VALUES OF THE SOLUTION TO WITHIN THE RANGE OF FROM ABOUT PH 8 TO ABOUT PH 7.1, ADDING SULPHURIC ACID TO THE SOLUTION TO REDUCE THE PH VALUE OF THE SOLUTION OF AT LEAST ABOUT PH 4 TO CONVERT SAID METAL VALUES TO SAID PRECIPITATE THEM FROM SAID SOLUTION AS METAL AMMONIUM SULPHATES, AND SEPARATING PRECIPITATED METAL AMMONIUM SULPHATES FROM SAID SOLUTION.
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) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |