US4059462A
Expired / Lapsed
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Niobium-iron rectangular hysteresis magnetic alloy
Assignee: Research Institute for Electromagnetic Materials
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Filing: 1976-10-29
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Granted: 1977-11-22
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Expires: 1996-10-29
Abstract
Abstract A rectangular hysteresis magnetic alloy consisting of 0.5-10 wt. % of Nb and the balance of Fe and a rectangular hysteresis magnetic alloy consisting of 0.5-10 wt. % of Nb, 0.01-60 wt. % in total amount of at least one element selected from the group consisting of 0-10% of V, 0-25% of Ta, 0-25% of Cr, 0-20% of Mo, 0-10% of W, 0-30% of Ni, 0-20% of Cu, 0-45% of Co, 0-5% of Ti, 0-5% of Zr, 0-5% of Si, 0-5% of Al, 0-5% of Ge, 0-5% of Sn, 0-5% of Sb, 0-3% of Be, 0-15% of Mn, 0-2% of Ce and 0-1.5% of C, and the balance of Fe have an excellent rectangular hysteresis loop, a coercive force of more than 2 oersteds, excellent forgeability and workability and are particularly suitable as a magnetic material for electromagnetic devices requiring rectangular hysteresis loop.
Inventors
- 👤 Hakaru Masumoto
- 👤 Yuetsu Murakami
- 👤 Naoji Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:00
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
57 words
A rectangular hysteresis magnetic material made of alloy consisting of 0.5 to 10% by weight of niobium and the balance of iron, said material being cold worked and then heat treated and having a coercive force of more than 2 oersteds, a residual induction of more than 12600 gauss and a squareness ratio of more than 80%.
Claim 2
Dependent Claim
57 words
A rectangular hysteresis magnetic material made of alloy consisting of 0.5 to 10% by weight of niobium and the balance of iron, said material being cold worked and then heat treated and having a coercive force of more than 2 oersteds, a residual induction of more than 12600 gauss and a squareness ratio of more than 80%.
Claim 3
Dependent Claim
35 words
A rectangular hysteresis magnetic material according to claim 1, wherein the material has been cold worked to a working ratio of more than 50% and heat treated at a temperature of at least 400° C.
Claim 4
Dependent Claim
40 words
A rectangular hysteresis magnetic material made of alloy as defined in claim 1, wherein said niobium content is 2 to 8% by weight and a squareness ratio is more than 90% and a residual induction of more than 12600 gauss.
Claim 5
Dependent Claim
35 words
A rectangular hysteresis magnetic material according to claim 3, wherein the material has been cold worked to a working ratio of more than 50% and heat treated at a temperature of at least 400° C.
Claim 6
Dependent Claim
170 words
A rectangular hysteresis magnetic material made of alloy consisting of 0.5 to 10% by weight of niobium, 0.01 to 60% by weight in total amount of at least one element selected from the group to subingredients consisting of 0 to 10% of vanadium, 0 to 25% of tantalum, 0 to 25% of chromium, 0 to 20% of molybdenum, 0 to 10% of tungsten, 0 to 20% of nickel, 0 to 20% of copper, 0-45% of cobalt, 0 to 5% of titanium, 0 to 5% of zirconium, 0 to 5% of silicon, 0 to 5% of aluminum, 0 to 5% of germanium, 0 to 5% of tin, 0 to 5% of antimony, 0 to 3% of beryllium, 0 to 15% of manganese, 0 to 2% of cerium, 0 to 1.5% of carbon and the balance of iron, said material being cold worked and then heat treated and having a coercive force of more than 2 oersteds, residual induction of more than 12600 gauss and a squareness ratio of more than 80%.
Claim 7
Dependent Claim
170 words
A rectangular hysteresis magnetic material made of alloy consisting of 0.5 to 10% by weight of niobium, 0.01 to 60% by weight in total amount of at least one element selected from the group to subingredients consisting of 0 to 10% of vanadium, 0 to 25% of tantalum, 0 to 25% of chromium, 0 to 20% of molybdenum, 0 to 10% of tungsten, 0 to 20% of nickel, 0 to 20% of copper, 0-45% of cobalt, 0 to 5% of titanium, 0 to 5% of zirconium, 0 to 5% of silicon, 0 to 5% of aluminum, 0 to 5% of germanium, 0 to 5% of tin, 0 to 5% of antimony, 0 to 3% of beryllium, 0 to 15% of manganese, 0 to 2% of cerium, 0 to 1.5% of carbon and the balance of iron, said material being cold worked and then heat treated and having a coercive force of more than 2 oersteds, residual induction of more than 12600 gauss and a squareness ratio of more than 80%.
Claim 8
Dependent Claim
35 words
A rectangular hysteresis magnetic material according to claim 5, wherein the material has been cold worked to a working ratio of more than 50% and heat treated at a temperature of at least 400° C.
Claim 9
Dependent Claim
122 words
A rectangular hysteresis magnetic material according to claim 5, wherein said niobium content is 2 to 8% by weight, and wherein the group of subingredients consists of 0 to 7% of vanadium, 0 to 15% of tantalum, 0 to 15% of chromium, 0 to 10% of molybdenum, 0 to 7% of tungsten, 0 to 20% of nickel, 0 to 7% of copper, 0 to 35% of cobalt, 0 to 3% of titanium, 0 to 3% of zirconium, 0 to 3% of silicon, 0 to 3% of aluminum, 0 to 3% of germanium, 0 to 3% of tin, 0 to 3% of antimony, 0 to 2% of beryllium, 0 to 7% of manganese, 0 to 1.5% of cerium, 0 to 1% of carbon.
Claim 10
Dependent Claim
35 words
A rectangular hysteresis magnetic material according to claim 7, wherein the material has been cold worked at a working ratio of more than 50% and heat treated at a temperature of at least 400° C.
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) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |