US4268430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrite composition having higher initial permeability and process for preparing molding product therefrom
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1980-01-28
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Granted: 1981-05-19
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Expires: 2000-01-28
Abstract
Abstract A ferrite composition containing a spinel ferrite and a small amount of a polyphenylene sulfide as a binder, which can provide a molding product having a higher initial permeability and excellent thermal, flame and arc resistances. The molding product is prepared by molding the composition at an elevated temperature under pressure. The use of a ferrite mixture of particle groups having different particle size distributions within the particle size range of 100μ to 5 mm. is preferred.
Inventors
- 👤 Kazuo Suzuki
- 👤 Kenichi Yokota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:42
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/36; H01F1/37; C; C08; C08K; C08K3/00; C08K3/18; C08K3/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
24 words
A composition consisting essentially of 92% to 99% by weight of a spinel ferrite and 8% to 1% by weight of a polyphenylene sulfide.
Claim 2
Dependent Claim
24 words
A composition consisting essentially of 92% to 99% by weight of a spinel ferrite and 8% to 1% by weight of a polyphenylene sulfide.
Claim 3
Dependent Claim
30 words
The composition of claim 1, wherein said spinel ferrite is a mixture of particle groups having different particle size distributions within the particle size range of 100μ to 5 mm.
Claim 4
Dependent Claim
39 words
The composition of claim 2, wherein said spinel ferrite is a mixture of a large particle group having a particle size of 400μ to 5 mm. and a small particle group having a particle size of 100μ to 350μ.
Claim 5
Dependent Claim
25 words
The composition of claim 3, wherein the ratio of the large particle group to the small particle group is from 90:10 to 20:80 by weight.
Claim 6
Dependent Claim
51 words
A process for preparing a molding product from a ferrite composition which comprises molding a composition consisting essentially of 92% to 99% by weight of a spinel ferrite and 8% to 1% by weight of a polyphenylene sulfide at a temperature within the melting range of the polyphenylene sulfide under pressure.
Claim 7
Dependent Claim
51 words
A process for preparing a molding product from a ferrite composition which comprises molding a composition consisting essentially of 92% to 99% by weight of a spinel ferrite and 8% to 1% by weight of a polyphenylene sulfide at a temperature within the melting range of the polyphenylene sulfide under pressure.
Claim 8
Dependent Claim
34 words
The process of claim 5, wherein the molding is carried out by a hot press molding at a temperature of 290° to 320° C. under a pressure of 2 of 6 tons/cm 2 .
Claim 9
Dependent Claim
52 words
The process of claims 5 or 6, wherein said spinel ferrite is a mixture of a large ferrite particle group having a particle size of 400μ to 5 mm. and a small ferrite particle group having a particle size of 100μ to 350μ in a ratio of 90:10 to 20:80 by weight.
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) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |