US4214895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing cobalt metal powder
Assignee: GTE Sylvania Inc
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Filing: 1979-05-14
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Granted: 1980-07-29
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Expires: 1999-05-14
Abstract
Abstract Fine particle size cobalt metal powder is prepared by treating an aqueous solution of a soluble cobaltic ammine halide with a sufficient amount of a soluble metallic hydroxide to form a cobalt containing precipitate. The precipitate is separated from the solution and reduced in a reducing atmosphere to produce metallic cobalt.
Inventors
- 👤 Richard G. W. Gingerich
- 👤 Clarence D. Vanderpool
- 👤 Mary A. Fedorchak
- 👤 Joseph E. Ritsko
- 👤 Michael J. Cheresnowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:46
CPC Classifications
C; C22; C22B; C22B23/00; C22B23/04; C22B23/0453; C22B23/0461; C22B23/0469; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22; C01; C01G; C01G51/00; C01G51/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
54 words
A method for producing fine cobalt metal powder comprising treating an aqueous solution of a soluble cobaltic ammine halide with a sufficient amount of a soluble metallic hydroxide to form a cobalt containing precipitate, separating the cobalt containing precipitate from the resulting solution, reducing said cobalt containing precipitate to form fine particles of cobalt.
Claim 2
Independent Claim
54 words
A method for producing fine cobalt metal powder comprising treating an aqueous solution of a soluble cobaltic ammine halide with a sufficient amount of a soluble metallic hydroxide to form a cobalt containing precipitate, separating the cobalt containing precipitate from the resulting solution, reducing said cobalt containing precipitate to form fine particles of cobalt.
Claim 3
Dependent Claim
19 words
A method according to claim 1 wherein said aqueous solution comprises greater than about 5 percent by weight cobalt.
Claim 4
Dependent Claim
29 words
A method according to claim 1 wherein said soluble cobaltic ammine halide is selected from the group consisting of cobaltic hexammine halide and cobaltic pentammine halide and mixtures thereof.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein said aqueous solution comprises greater than about 15 percent by weight cobalt.
Claim 6
Dependent Claim
20 words
A method according to claim 1 wherein said metallic hydroxide is an alkali metal hydroxide or alkaline earth metal hydroxide.
Claim 7
Dependent Claim
15 words
A method according to claim 5 wherein said metallic hydroxide is an alkali metal hydroxide.
Claim 8
Dependent Claim
16 words
A method according to claim 6 wherein said metallic hydroxide is sodium hydroxide or potassium hydroxide.
Claim 9
Dependent Claim
32 words
A method according to claim 7 wherein said aqueous solution is treated by adding metallic hydroxide to said solution until said solution has a pH of from about 10 to about 12.
Claim 10
Dependent Claim
29 words
A method according to claim 8 wherein metallic hydroxide is present in an amount at least equal to a stoichiometric amount to permit the formation of cobalt oxide hydrate.
Claim 11
Dependent Claim
31 words
A method according to claim 8 wherein said addition is carried out at a temperature greater than about 50° C. and for a period of time greater than about 15 minutes.
Claim 12
Dependent Claim
37 words
A method according to claim 8 wherein said addition is carried out a temperature greater than about 60° C. up to the boiling point of said solution for a period of time greater than about 30 minutes.
Claim 13
Dependent Claim
19 words
A method according to claim 8 wherein said cobalt containing precipitate comprises a black cobalt hydrate in amorphous form.
Claim 14
Dependent Claim
25 words
A method according to claim 12 werein said cobalt containing precipitate is reducible to cobalt particles having a particle size less than about 2 microns.
Claim 15
Dependent Claim
43 words
A method according to claim 1 wherein said aqueous solution of a soluble cobaltic ammine complex is formed from an aqueous solution comprising cobaltous and cobaltic ion by adding ammonia hydroxide to said solution and oxidizing the cobaltous ion to the cobaltic ion.
References Cited (Backward Citations)
DE1583864C
Cited
US2826499A
Cited
US2879137A
Cited
DE2319703A1
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US3928530A
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US3933976A
Cited
US4108640A
Cited
US4093450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-29 | 1984-01-28 | 1984-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-29 | 1988-01-28 | 1988-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-29 | 1992-01-28 | 1992-07-29 | $7700.00 | Window Closed / Lapsed |