US4409041A
Expired / Lapsed
US
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Amorphous alloys for electromagnetic devices
Assignee: Honeywell International Inc
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Filing: 1981-07-29
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Granted: 1983-10-11
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Expires: 2001-07-29
Abstract
Abstract An iron based, boron containing magnetic alloy having at least 85 percent of its structure in the form of an amorphous metal matrix is annealed in the absence of a magnetic field at a temperature and for a time sufficient to induce precipitation therein of discrete particles of its constituents. The resulting alloy has decreased high frequency core losses and increased low field permeability; is particularly suited for high frequency applications.
Inventors
- 👤 Amitava Datta
- 👤 Lance A. Davis
- 👤 Nicholas J. DeCristofaro
- 👤 Jordi Marti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:35
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/32; C22C45/00; C22C45/02; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15341
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
A magnetic alloy consisting essentially of iron, boron and silicon having at least 85 percent of its structure in the form of an amorphous metal matrix, said alloy having been annealed at a temperature and for a time sufficient to induce precipitation of discrete particles of its constituents in said amorphous metal matrix, said particles having an average size ranging from about 0.05 m to 1 m and an average interparticle spacing of about 1 m to 10 m, and constitute an average volume fraction of said alloy of about 0.01 to 0.3.
Claim 2
Dependent Claim
93 words
A magnetic alloy consisting essentially of iron, boron and silicon having at least 85 percent of its structure in the form of an amorphous metal matrix, said alloy having been annealed at a temperature and for a time sufficient to induce precipitation of discrete particles of its constituents in said amorphous metal matrix, said particles having an average size ranging from about 0.05 m to 1 m and an average interparticle spacing of about 1 m to 10 m, and constitute an average volume fraction of said alloy of about 0.01 to 0.3.
Claim 3
Dependent Claim
20 words
An alloy as recited in claim 1, wherein said alloy has been annealed in the presence of a magnetic field.
Claim 4
Dependent Claim
20 words
An alloy as recited in claim 1, wherein said alloy has been annealed in the absence of a magnetic field.
Claim 5
Dependent Claim
24 words
An alloy as recited in claim 3, wherein said discrete particles constitute an average volume fraction of said alloy of about 0.01 to 0.15.
Claim 6
Dependent Claim
22 words
An alloy as recited in claim 3, wherein said discrete particles have an average particle size of about 0.1 to 0.5 μm.
Claim 7
Dependent Claim
22 words
An alloy as recited in claim 3, wherein said average interparticle spacing of said discrete particles is about 2 to 6 μm.
Claim 8
Dependent Claim
63 words
An alloy as recited in claim 3, said alloy consisting essentially of a composition having the formula Fe a B b Si c C d , wherein "a", "b", "c", and "d" are atomic percentages ranging from about 74 to 84, 8 to 24, 0 to 16 and 0 to 3, respectively, with the proviso that "a", "b", "c" and "d" equals 100.
Claim 9
Dependent Claim
63 words
An alloy as recited in claim 2, said alloy consisting essentially of a composition having the formula Fe a B b Si c C d , wherein "a", "b", "c", and "d" are atomic percentages ranging from about 74 to 84, 8 to 24, 0 to 16 and 0 to 3, respectively, with the proviso that "a", "b", "c" and "d" equals 100.
References Cited (Backward Citations)
US3856513A
Cited
US4036638A
Cited
US4038073A
Cited
US4264358A
Cited
US4226619A
Cited
US4219355A
Cited
US4249969A
Cited
US4298409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |