US4131494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant magnetic alloy
Assignee: Toshiba Corp
•
Filing: 1977-03-04
•
Granted: 1978-12-26
•
Expires: 1997-03-04
Abstract
Abstract Corrosion resistant magnetic alloy consisting essentially of Ni (20 to less than 35% by weight), Cr (3 to 15% by weight), at least one of Co (0.1 to 10% by weight) and Cu (0.1 to 15% by weight), and the balance of essentially Fe. The alloy is excellent in magnetic property, high in corrosion resistance and, thus, suitable for use as a magnetic shielding material.
Inventors
- 👤 Kenichiro Momose
- 👤 Kiyoshi Kumagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:01
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/52; C22C38/42; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14708
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A corrosion resistant magnetic alloy with high magnetic permeability, said alloy consisting essentially of Ni in an amount ranging from 30% to less than 35% by weight, Cr in an amount ranging between 8% and 12% by weight, a metal selected from the group consisting of Co, Cu and mixtures thereof, and the balance of essentially Fe, the Co content when present ranging between 2% and 5% by weight and the Cu content when present between 1% and 5% by weight, the initial magnetic permeability of said alloy being at least 1000 and the flux density under a magnetic intensity of 10 oersteds.
Claim 2
Dependent Claim
103 words
A corrosion resistant magnetic alloy with high magnetic permeability, said alloy consisting essentially of Ni in an amount ranging from 30% to less than 35% by weight, Cr in an amount ranging between 8% and 12% by weight, a metal selected from the group consisting of Co, Cu and mixtures thereof, and the balance of essentially Fe, the Co content when present ranging between 2% and 5% by weight and the Cu content when present between 1% and 5% by weight, the initial magnetic permeability of said alloy being at least 1000 and the flux density under a magnetic intensity of 10 oersteds.
Claim 3
Dependent Claim
76 words
A corrosion resistant magnetic alloy with high magnetic permeability, said alloy consisting essentially of Ni in an amount ranging from 30% to less than 35% by weight, Cr in an amount ranging between 8% and 12% by weight, Cu in an amount between 1% and 5% by weight and the balance of essentially Fe, the initial magnetic permeability of said alloy being at least 1000 and the flux density under a magnetic intensity of 10 oersteds.
Claim 4
Dependent Claim
76 words
A corrosion resistant magnetic alloy with high magnetic permeability, said alloy consisting essentially of Ni in an amount ranging from 30% to less than 35% by weight, Cr in an amount ranging between 8% and 12% by weight, Cu in an amount between 1% and 5% by weight and the balance of essentially Fe, the initial magnetic permeability of said alloy being at least 1000 and the flux density under a magnetic intensity of 10 oersteds.
Claim 5
Dependent Claim
77 words
A corrosion resistant magnetic alloy with high magnetic permeability, said alloy consisting essentially of Ni in an amount ranging from 30% to less than 35% by weight, Cr in an amount ranging between 8% and 12% by weight, Co in an amount ranging between 2% and 5% by weight, and the balance of essentially Fe, the initial magnetic permeability of said alloy being at least 1000 and the flux density under a magnetic intensity of 10 oersteds.
Claim 6
Dependent Claim
77 words
A corrosion resistant magnetic alloy with high magnetic permeability, said alloy consisting essentially of Ni in an amount ranging from 30% to less than 35% by weight, Cr in an amount ranging between 8% and 12% by weight, Co in an amount ranging between 2% and 5% by weight, and the balance of essentially Fe, the initial magnetic permeability of said alloy being at least 1000 and the flux density under a magnetic intensity of 10 oersteds.
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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |