US4557769A
Expired / Lapsed
US
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Soft magnetic material
Assignee: Alps Alpine Co Ltd
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Filing: 1984-07-16
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Granted: 1985-12-10
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Expires: 2004-07-16
Abstract
Abstract A soft magnetic material having a low coercive force and a high permeability without reduction in saturation magnetic flux density is composed of a Co-base Co-Hf-Ta amorphous alloy containing 1 to 5 atoms % Hf and 4 to 10 atoms % Ta. The amorphous alloy is prepared by sputtering, etc.
Inventors
- 👤 Yutaka Shimada
- 👤 Koichi Mukasa
- 👤 Takashi Hatanai
- 👤 Keishi Nakashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:39
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; C; C22; C22C; C22C45/00; C22C45/04; C22C19/00; C22C19/07; H01F1/147; H01F1/153; H01F1/15316
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
44 words
A soft magnetic material consisting of a cobalt-base ternary amorphous alloy containing hafnium and tantalum, the content of said hafnium being from 1 atom % to 5 atom % and the content of said tantalum being from 4 atom % to 10 atom %.
Claim 2
Dependent Claim
44 words
A soft magnetic material consisting of a cobalt-base ternary amorphous alloy containing hafnium and tantalum, the content of said hafnium being from 1 atom % to 5 atom % and the content of said tantalum being from 4 atom % to 10 atom %.
Claim 3
Dependent Claim
28 words
The soft magnetic material as claimed in claim 1, wherein the content of said hafnium is in the range of from 1.5 atom % to 3 atom %.
Claim 4
Dependent Claim
28 words
The soft magnetic material as claimed in claim 1, wherein the content of said tantalum is in the range of from 6 atom % to 8 atom %.
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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |