US4477319A
Expired / Lapsed
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Process for forming a ferrite film
Assignee: Mitsubishi Chemical Corp
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Filing: 1983-12-08
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Granted: 1984-10-16
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Expires: 2003-12-08
Abstract
Abstract A process for forming a ferrite film, which is characterized in that in an aqueous solution containing at least ferrous ions as metal ions, ferrous hydroxide ions FeOH + , or FeOH + and other metal hydroxide ions, are uniformly adsorbed on the surface of a solid by an interfacial reaction at an interfacial boundary between the solid and the aqueous solution; and the adsorbed FeOH + is oxidized to FeOH 2+ , whereupon FeOH 2+ and metal hydroxide ions in the aqueous solution undergo a ferrite crystallization reaction to precipitate a ferrite layer on the surface of the solid.
Inventors
- 👤 Masanori Abe
- 👤 Yutaka Tamaura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:41
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; C; C23; C23C; C23C22/00; C23C22/05; C23C22/68; H01F41/00; H01F41/14; H01F41/24; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
A process for forming a ferrite film, which is characterized in that in an aqueous solution containing at least ferrous ions as metal ions, ferrous hydroxide ions FeOH + , or FeOH + and other metal hydroxide ions, are uniformly adsorbed on the surface of a solid by an interfacial reaction at an interfacial boundary between the solid and the aqueous solution; and the adsorbed FeOH + is oxidized to FeOH 2+ , whereupon FeOH 2+ and metal hydroxide ions in the aqueous solution undergo a ferrite crystallization reaction to deposit a ferrite layer on the surface of the solid.
Claim 2
Dependent Claim
100 words
A process for forming a ferrite film, which is characterized in that in an aqueous solution containing at least ferrous ions as metal ions, ferrous hydroxide ions FeOH + , or FeOH + and other metal hydroxide ions, are uniformly adsorbed on the surface of a solid by an interfacial reaction at an interfacial boundary between the solid and the aqueous solution; and the adsorbed FeOH + is oxidized to FeOH 2+ , whereupon FeOH 2+ and metal hydroxide ions in the aqueous solution undergo a ferrite crystallization reaction to deposit a ferrite layer on the surface of the solid.
Claim 3
Dependent Claim
35 words
The process for forming a ferrite film according to claim 1, wherein at least the surface layer of the solid is made of a substance having a surface activity for adsorption of FeOH + .
Claim 4
Dependent Claim
30 words
The process for forming a ferrite film according to claim 1, wherein a gas/liquid interface is formed on the surface of the solid to provide a surface activity for adsorption.
Claim 5
Dependent Claim
42 words
The process for forming a ferrite film according to claim 1, wherein at least the surface layer of the solid is made of a substance having a surface activity for adsorption of FeOH + and a catalytic activity for the oxidation reaction.
Claim 6
Dependent Claim
25 words
The process for forming a ferrite film according to claim 1, wherein the oxidation of FeOH + is conducted by a chemical or electrochemical method.
Claim 7
Dependent Claim
42 words
The process for forming a ferrite film according to claim 3, wherein the gas/liquid interface is formed on the surface of the solid by using a gas containing oxygen, to provide an oxidizing effect as well as a surface activity for adsorption.
Claim 8
Dependent Claim
110 words
A process for forming a ferrite film, which is characterized in that in an aqueous solution containing at least ferrous ions as metal ions, ferrous hydroxide ions FeOH + , or FeOH + and other metal hydroxide ions, are uniformly adsorbed on the surface of a solid by an interfacial reaction at an interfacial boundary between the solid and the aqueous solution, and the adsorbed FeOH + is oxidized to FeOH 2+ , whereupon FeOH 2+ and metal hydroxide ions in the aqueous solution undergo a ferrite crystallization reaction, the above series of reactions being conducted while imparting vibrations to the interfacial boundary between the solid and the aqueous solution.
Claim 9
Dependent Claim
110 words
A process for forming a ferrite film, which is characterized in that in an aqueous solution containing at least ferrous ions as metal ions, ferrous hydroxide ions FeOH + , or FeOH + and other metal hydroxide ions, are uniformly adsorbed on the surface of a solid by an interfacial reaction at an interfacial boundary between the solid and the aqueous solution, and the adsorbed FeOH + is oxidized to FeOH 2+ , whereupon FeOH 2+ and metal hydroxide ions in the aqueous solution undergo a ferrite crystallization reaction, the above series of reactions being conducted while imparting vibrations to the interfacial boundary between the solid and the aqueous solution.
References Cited (Backward Citations)
US2582590A
Cited
US3703411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |