Patent US4028144A successfully refreshed from Google Patents.
US4028144A
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Semi-hard magnetic alloy with composite magnetic property and method of making the same
Assignee: NTT Inc
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Filing: 1975-08-14
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Granted: 1977-06-07
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Expires: 1995-08-14
Abstract
Abstract A semi-hard magnetic alloy is described which consists of, by weight, 15-50% Co, 5-25% Ni, 1-9% Cr, balance Fe and incidental impurities and containing further a positive amount of up to 10% Cu or Ti. The alloy is characterized by exhibiting composite hysteresis characteristics as shown in FIG. 3 of the drawings. The alloy may be produced by a repetitive cold-working and subsequent annealing steps, the annealing step being carried out at temperatures of between 450 DEG and 750 DEG C.
Inventors
- 👤 Hiroshi Tomishima
- 👤 Toshio Takahashi
- 👤 Kenichi Ono
- 👤 Kazuhiro Kumasaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:38
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/10; C22C38/105; C21; C21D; C21D8/00; C21D8/12; C22C38/18; C22C38/40; C22C38/52; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
38 words
A cold-worked and annealed semi-hard magnetic alloy consisting essentially of, by weight, 15-50% Co, 5-25% Ni, 1-9% Cr, 0.5-10% Cu, balance Fe and incidental impurities, and further characterized by exhibiting composite hysteresis characteristics as shown in FIG. 3.
Claim 2
Dependent Claim
38 words
A cold-worked and annealed semi-hard magnetic alloy consisting essentially of, by weight, 15-50% Co, 5-25% Ni, 1-9% Cr, 0.5-10% Cu, balance Fe and incidental impurities, and further characterized by exhibiting composite hysteresis characteristics as shown in FIG. 3.
Claim 3
Dependent Claim
38 words
A cold-worked and annealed semi-hard magnetic alloy consisting essentially of, by weight, 15-50% Co, 5-25% Ni, 1-9% Cr, 0.2-7% Ti, balance Fe and incidental impurities, and further characterized by exhibiting composite hysteresis characteristics as shown in FIG. 3.
Claim 4
Dependent Claim
38 words
A cold-worked and annealed semi-hard magnetic alloy consisting essentially of, by weight, 15-50% Co, 5-25% Ni, 1-9% Cr, 0.2-7% Ti, balance Fe and incidental impurities, and further characterized by exhibiting composite hysteresis characteristics as shown in FIG. 3.
Claim 5
Dependent Claim
50 words
A cold-worked and annealed semi-hard magnetic alloy consisting essentially of, by weight, 15-50% Co, 5-25% Ni, 1-9% Cr, 0.2-7% Ti, 0.5-10% Cu, balance Fe and incidental impurities, the sum total of Cu and Ti not exceeding 10%, and further characterized by exhibiting composite hysteresis characteristics as shown in FIG. 3.
Claim 6
Dependent Claim
50 words
A cold-worked and annealed semi-hard magnetic alloy consisting essentially of, by weight, 15-50% Co, 5-25% Ni, 1-9% Cr, 0.2-7% Ti, 0.5-10% Cu, balance Fe and incidental impurities, the sum total of Cu and Ti not exceeding 10%, and further characterized by exhibiting composite hysteresis characteristics as shown in FIG. 3.
Claim 7
Dependent Claim
25 words
The alloy according to claim 1, wherein Co is 20%, Ni is 12%, Cr is 8%, Cu is 3% and Fe is 57%, by weight.
Claim 8
Dependent Claim
25 words
The alloy according to claim 1, wherein Co is 20%, Ni is 10%, Cr is 9%, Cu is 3% and Fe is 58%, by weight.
Claim 9
Dependent Claim
25 words
The alloy according to claim 1, wherein Co is 20%, Ni is 10%, Cr is 9%, Cu is 4% and Fe is 57%, by weight.
Claim 10
Dependent Claim
25 words
The alloy according to claim 1, wherein Co is 25%, Ni is 12%, Cr is 7%, Cu is 3% and Fe is 53%, by weight.
Claim 11
Independent Claim
136 words
A method of making a semi-hard magnetic alloy exhibiting composite hysteresis characteristics as shown in FIG. 3, which comprises the steps of providing an alloy composition consisting essentially of, by weight, 15-50% Co, 5-25% Ni, 1-9% Cr and an element selected from the group consisting of Cu and Ti, balance Fe and incidental impurities, repeatedly and alternately cold working and annealing the alloy, said annealing being carried out at temperatures of between 450 and 750° C, the alloy composition being further characterized in that when the selected element is copper, this is present in the range of 0.5-10% by weight, when the selected element is titanium, this is present in the range of 0.2-7% by weight, and when the selected elements are both copper and titanium the sum total thereof does not exceed 10% by weight.
Claim 12
Independent Claim
136 words
A method of making a semi-hard magnetic alloy exhibiting composite hysteresis characteristics as shown in FIG. 3, which comprises the steps of providing an alloy composition consisting essentially of, by weight, 15-50% Co, 5-25% Ni, 1-9% Cr and an element selected from the group consisting of Cu and Ti, balance Fe and incidental impurities, repeatedly and alternately cold working and annealing the alloy, said annealing being carried out at temperatures of between 450 and 750° C, the alloy composition being further characterized in that when the selected element is copper, this is present in the range of 0.5-10% by weight, when the selected element is titanium, this is present in the range of 0.2-7% by weight, and when the selected elements are both copper and titanium the sum total thereof does not exceed 10% by weight.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |