Patent US3000727A successfully refreshed from Google Patents.
US3000727A
Expired / Lapsed
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Separation of iron impurity from cobalt-bearing solutions
Assignee: Freeport Minerals Co
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Filing: 1958-01-27
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Granted: 1961-09-19
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Expires: 1978-01-27
Abstract
No abstract record available.
Inventors
- 👤 Raphael F Matson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:20
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0453; C22B23/0461
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN THE SEPARATION OF IRON IMPURITY FROM ACIDIC COBALT-BEARING AQUEOUS SOLUTIONS WHEREIN THE IRON IS SELECTIVELY PRECIPITATED BY ADJUSTING THE HYDROGEN ION CONCENTRATION OF THE SOLUTION TO A LEVEL AT WHICH SUCH PRECIPITATION TAKES PLACE, THE IMPROVEMENT IN WHICH THE FERROUS-IRON AS WELL AS ANY FERRIC IRON IMPURITY PRESENT IN THE SOLUTION IS SEPARATED WHICH COMPRISES, OXIDIZING THE FERROUS IRON IMPURITY IN SAID SOLUTION BY REACTING THE SAME WITH COBALTIC PENTAMMINE BEFORE THE SELECTIVE PRECIPITATION TREATMENT IS COMPLETED.
Claim 2
Dependent Claim
78 words
IN THE SEPARATION OF IRON IMPURITY FROM ACIDIC COBALT-BEARING AQUEOUS SOLUTIONS WHEREIN THE IRON IS SELECTIVELY PRECIPITATED BY ADJUSTING THE HYDROGEN ION CONCENTRATION OF THE SOLUTION TO A LEVEL AT WHICH SUCH PRECIPITATION TAKES PLACE, THE IMPROVEMENT IN WHICH THE FERROUS-IRON AS WELL AS ANY FERRIC IRON IMPURITY PRESENT IN THE SOLUTION IS SEPARATED WHICH COMPRISES, OXIDIZING THE FERROUS IRON IMPURITY IN SAID SOLUTION BY REACTING THE SAME WITH COBALTIC PENTAMMINE BEFORE THE SELECTIVE PRECIPITATION TREATMENT IS COMPLETED.
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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |