US3989555A
Expired / Lapsed
US
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Nickel-iron material having high magnetic permeability
Assignee: Nippon Gakki Co Ltd
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Filing: 1975-06-20
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Granted: 1976-11-02
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Expires: 1995-06-20
Abstract
Abstract A material having a high magnetic permeability made by a base composition consisting essentially of, by weight, 75-82 percent of nickel and 5-24 percent of iron, with or without 2-6 percent of molybdenum, 1 or less percent of manganese, 1 or less percent of silicon, and by an additive mixture consisting of at least two different types of elements, one of which types of elements being at least one element selected from the group of elements consisting of titanium, zirconium, vanadium, niobium, chromium and tungsten, and the other being aluminum, said additive being contained in said base composition in an amount that the total content of said at least two different types of elements falls within the range of 1-8 percent of the whole weight of said material. This material exhibits a high mechanical strength, and toughness, a high resistance to wear from friction and a high magnetic permeability.
Inventors
- 👤 Tomoo Yamagishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:09
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14708
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
A high magnetic permeability heat-treated and worked alloy for magnetic head cores, consisting essentially of ______________________________________
Element % by Weight
______________________________________
Ni 75-82
Fe 5-24
Al 0.5-3.0
Nb 0.2-3.0
Ti 0.3-2.0
______________________________________ wherein said alloy is characterized by an initial permeability of at least 21,000, a Vicker's hardness of at least 180, and a coercive force (Hc) of up to 1.91.
Claim 2
Dependent Claim
61 words
A high magnetic permeability heat-treated and worked alloy for magnetic head cores, consisting essentially of ______________________________________
Element % by Weight
______________________________________
Ni 75-82
Fe 5-24
Al 0.5-3.0
Nb 0.2-3.0
Ti 0.3-2.0
______________________________________ wherein said alloy is characterized by an initial permeability of at least 21,000, a Vicker's hardness of at least 180, and a coercive force (Hc) of up to 1.91.
Claim 3
Dependent Claim
62 words
A high magnetic permeability heat-treated and worked alloy for magnetic core heads consisting essentially of ______________________________________
Element % by Weight
______________________________________
Ni 75-82
Fe 5-24
Al 0.5-3.0
V 0.5-3.0
Ti 0.5-3.0
______________________________________ wherein said alloy is characterized by an initial permeability of at least 13,000, a Vicker's hardness of at least 188, and a coercive force (Hc) of up to 2.39 A/m.
Claim 4
Dependent Claim
62 words
A high magnetic permeability heat-treated and worked alloy for magnetic core heads consisting essentially of ______________________________________
Element % by Weight
______________________________________
Ni 75-82
Fe 5-24
Al 0.5-3.0
V 0.5-3.0
Ti 0.5-3.0
______________________________________ wherein said alloy is characterized by an initial permeability of at least 13,000, a Vicker's hardness of at least 188, and a coercive force (Hc) of up to 2.39 A/m.
Claim 5
Dependent Claim
61 words
A high magnetic permeability heat-treated and worked alloy for magnetic core heads consisting essentially of ______________________________________
Element % by Weight
______________________________________
Ni 75-82
Fe 5-24
Al 0.5-4.0
W 0.2-3.0
Ti 0.3-2.0
______________________________________ wherein said alloy is characterized by an initial permeability of at least 14,000, a Vicker's hardness of at least 186 and a coercive force (Hc) of up to 2.07.
Claim 6
Dependent Claim
61 words
A high magnetic permeability heat-treated and worked alloy for magnetic core heads consisting essentially of ______________________________________
Element % by Weight
______________________________________
Ni 75-82
Fe 5-24
Al 0.5-4.0
W 0.2-3.0
Ti 0.3-2.0
______________________________________ wherein said alloy is characterized by an initial permeability of at least 14,000, a Vicker's hardness of at least 186 and a coercive force (Hc) of up to 2.07.
Claim 7
Dependent Claim
61 words
A high magnetic permeability heat-treated and worked alloy for magnetic core heads consisting essentially of ______________________________________
Element % by Weight
______________________________________
Ni 75-82
Fe 5-24
Al 0.5-4.0
Cr 0.3-2.0
Ti 0.2-2.0
______________________________________ wherein said alloy is characterized by an initial permeability of at least 13,000, a Vicker's hardness of at least 184 and a coercive force (Hc) of up to 3.18.
Claim 8
Dependent Claim
61 words
A high magnetic permeability heat-treated and worked alloy for magnetic core heads consisting essentially of ______________________________________
Element % by Weight
______________________________________
Ni 75-82
Fe 5-24
Al 0.5-4.0
Cr 0.3-2.0
Ti 0.2-2.0
______________________________________ wherein said alloy is characterized by an initial permeability of at least 13,000, a Vicker's hardness of at least 184 and a coercive force (Hc) of up to 3.18.
Claim 9
Dependent Claim
63 words
A high magnetic permeability heat-treated and worked alloy for magnetic core heads consisting essentially of ______________________________________
Element % by Weight
______________________________________
Ni 75-82
Fe 5-24
Al 0.5-3.5
Zr 0.2-3.5
Nb 0.3-2.0
______________________________________ wherein said alloy is characterized by an initial permeability of at least 10,000, by a Vicker's hardness of at least 180 and a coercive force (Hc) of up to 2.39 A/m.
Claim 10
Dependent Claim
63 words
A high magnetic permeability heat-treated and worked alloy for magnetic core heads consisting essentially of ______________________________________
Element % by Weight
______________________________________
Ni 75-82
Fe 5-24
Al 0.5-3.5
Zr 0.2-3.5
Nb 0.3-2.0
______________________________________ wherein said alloy is characterized by an initial permeability of at least 10,000, by a Vicker's hardness of at least 180 and a coercive force (Hc) of up to 2.39 A/m.
References Cited (Backward Citations)
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GB278454A
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US1910309A
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US2002689A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |