Patent US6256256B1 successfully refreshed from Google Patents.
US2531336A
Expired / Lapsed
US
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Recovery of nickel and cobalt compounds
Assignee: Nicaro Nickel Co
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Filing: 1946-03-18
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Granted: 1950-11-21
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Expires: 1966-03-18
Abstract
No abstract record available.
Inventors
- 👤 Robert C Hills
- 👤 Maurice F Dufour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:47
CPC Classifications
C; C01; C01G; C01G51/00; C01G51/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE RECOVERY OF NICKEL FROM TECHNICAL AMMONIACAL LEACH SOLUTIONS CONTAINING NICKEL AND COBALT COMPOUNDS AND THE USUAL IMPURITIES INCLUDING AT LEAST ONE OF SULFUR, SELENIUM, AND TELLURIUM, THE PROCESS OF OBTAINING THE NICKEL CONTENT SUBSTANTIALLY FREE OF COBALT WHICH COMPRISES CONVERTING SAID NAMED IMPURITIES, BY OXIDATION, INTO A FORM WHICH DOES NOT INHBIT THE OXIDATION OF THE COBALTOUS COMPOUNDS PRESENT INTO THE COBALTIC STATE, OXIDIZING THE COBALTOUS CONTENT TO THE COBALTIC STATE IN SAID AMMONONIACAL LEACH SOLUTION, DISTILLING AMMONIA FROM SAID SOLUTION UNTIL THE NICKEL CONTENT PRECIPITATES OUT FROM THE SOLUTION CONTAINING THE COBALTIC COMPOUNDS STILL IN SOLUTION, AND SEPARATING THE PRECIPITATED NICKEL COMPOUND FROM THE SAID SOLUTION.
Claim 2
Dependent Claim
109 words
IN THE RECOVERY OF NICKEL FROM TECHNICAL AMMONIACAL LEACH SOLUTIONS CONTAINING NICKEL AND COBALT COMPOUNDS AND THE USUAL IMPURITIES INCLUDING AT LEAST ONE OF SULFUR, SELENIUM, AND TELLURIUM, THE PROCESS OF OBTAINING THE NICKEL CONTENT SUBSTANTIALLY FREE OF COBALT WHICH COMPRISES CONVERTING SAID NAMED IMPURITIES, BY OXIDATION, INTO A FORM WHICH DOES NOT INHBIT THE OXIDATION OF THE COBALTOUS COMPOUNDS PRESENT INTO THE COBALTIC STATE, OXIDIZING THE COBALTOUS CONTENT TO THE COBALTIC STATE IN SAID AMMONONIACAL LEACH SOLUTION, DISTILLING AMMONIA FROM SAID SOLUTION UNTIL THE NICKEL CONTENT PRECIPITATES OUT FROM THE SOLUTION CONTAINING THE COBALTIC COMPOUNDS STILL IN SOLUTION, AND SEPARATING THE PRECIPITATED NICKEL COMPOUND FROM THE 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) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |