US4536229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fe-Ni-Mo magnet alloys and devices
Assignee: Nokia Bell Labs
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Filing: 1983-11-08
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Granted: 1985-08-20
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Expires: 2003-11-08
Abstract
Abstract Essentially cobalt-free alloys are disclosed having a coercive force which is greater than or equal to 40 oersteds and having a magnetic squareness which is greater than or equal to 0.6. Such alloys comprise Fe, Ni, and Mo, and their approximate compositions are specified by 16-30 weight percent Ni and 3-10 weight percent Mo, remainder essentially Fe. Disclosed alloys are useful in memory and security devices.
Inventors
- 👤 Sungho Jin
- 👤 Thomas H. Tiefel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:19
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/08; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
Device comprising a body of a magnetic alloy having a coercive force which is greater than or equal to 40 oersteds and a magnetic squareness which is greater than or equal to 0.6, said device being characterized in that said alloy comprises Fe, Ni, and Mo in a combined amount which is greater than or equal to 95 weight percent of said body, Ni content of said alloy being in the range of 16-30 weight percent of said combined amount, Mo content of said alloy in the range of from 3-10 weight percent of said combined amount, and each of the elements Si, Al, Cu, V, Ti, Nb, Zr, Ta, Hf, and W being present in said alloy in an amount which is less than 0.5 weight percent of said combined amount.
Claim 2
Dependent Claim
132 words
Device comprising a body of a magnetic alloy having a coercive force which is greater than or equal to 40 oersteds and a magnetic squareness which is greater than or equal to 0.6, said device being characterized in that said alloy comprises Fe, Ni, and Mo in a combined amount which is greater than or equal to 95 weight percent of said body, Ni content of said alloy being in the range of 16-30 weight percent of said combined amount, Mo content of said alloy in the range of from 3-10 weight percent of said combined amount, and each of the elements Si, Al, Cu, V, Ti, Nb, Zr, Ta, Hf, and W being present in said alloy in an amount which is less than 0.5 weight percent of said combined amount.
Claim 3
Dependent Claim
21 words
Device of claim 1 in which said alloy has a coercive force which is greater than or equal to 100 oersteds.
Claim 4
Dependent Claim
20 words
Device of claim 1 in which said alloy has a magnetic squareness which is greater than or equal to 0.7.
Claim 5
Dependent Claim
21 words
Device of claim 1 in which said combined amount is greater than or equal to 98 weight percent of said body.
Claim 6
Dependent Claim
10 words
Device of claim 1, said device being a magnetic memory.
Claim 7
Dependent Claim
10 words
Device of claim 1, said device being a security device.
Claim 8
Dependent Claim
10 words
Device of claim 6, said device being an anti-theft device.
Claim 9
Dependent Claim
127 words
Magnetic alloy having a coercive force which is greater than or equal 40 oersteds and a magnetic squareness which is greater than or equal to 0.6, said alloy being characterized in that said alloy comprises Fe, Ni, and Mo in a combined amount which is greater than or equal to 95 weight percent of said body, Ni content of said alloy being in the range of 16-30 weight percent of said combined amount, and Mo content of said alloy being in the range of from 3-10 weight percent of said combined amount, and each of the elements Si, Al, Cu, V, Ti, Nb, Zr, Ta, Hf, and W being present in said alloy in an amount which in less than 0.5 weight percent of said combined amount.
Claim 10
Dependent Claim
127 words
Magnetic alloy having a coercive force which is greater than or equal 40 oersteds and a magnetic squareness which is greater than or equal to 0.6, said alloy being characterized in that said alloy comprises Fe, Ni, and Mo in a combined amount which is greater than or equal to 95 weight percent of said body, Ni content of said alloy being in the range of 16-30 weight percent of said combined amount, and Mo content of said alloy being in the range of from 3-10 weight percent of said combined amount, and each of the elements Si, Al, Cu, V, Ti, Nb, Zr, Ta, Hf, and W being present in said alloy in an amount which in less than 0.5 weight percent of said combined amount.
Claim 11
Dependent Claim
34 words
Magnetic alloy of claim 8 in which said alloy has a coercive force which is greater than or equal to 100 oersteds and a magnetic squareness which is greater than or equal to 0.7.
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) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |