US4298381A
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Abrasion-resistive high permeability magnetic alloy
Assignee: Kokusai Denki Electric Inc
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Filing: 1979-12-18
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Granted: 1981-11-03
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Expires: 1999-12-18
Abstract
Abstract Abrasion-resistive, high permeability magnetic alloy consisting essentially of 6-9 wt. % of Si, 7-11 wt. % of Al, 2-5 wt. % of Cr, 0.05-2 wt. % of Ti, 0.02-0.3 wt. % of at least one member selected from P and C, and the balance of Fe. The alloy is suitable as a core material for a magnetic head.
Inventors
- 👤 Mitsuhiro Kudo
- 👤 Shigekazu Otomo
- 👤 Hirotomo Ogihara
- 👤 Yoshio Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:44
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/06; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14791
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
44 words
Abrasion-resistive, high permeability magnetic alloy consisting of 6-9 wt.% of Si, 7-11 wt.% of Al, 2-5 wt.% of Cr, 0.5-2 wt.% of Ti, 0.02-0.3 wt.% of at least one member selected from the group consisting of P and C and the balance of Fe.
Claim 2
Dependent Claim
44 words
Abrasion-resistive, high permeability magnetic alloy consisting of 6-9 wt.% of Si, 7-11 wt.% of Al, 2-5 wt.% of Cr, 0.5-2 wt.% of Ti, 0.02-0.3 wt.% of at least one member selected from the group consisting of P and C and the balance of Fe.
Claim 3
Dependent Claim
82 words
An abrasive-resistive, high-permeability magnetic alloy consisting essentially of 6-9 wt. % of Si, 7-11 wt. % of Al, 2-5 wt. % of Cr, 0.5-2 wt. % of Ti, 0.02-0.3 wt. % of at least one member selected from the group consisting of P and C, and the balance of Fe which has been heated at a temperature between 850° C. and 1,100° C. for 0.5-3 hours in a non-oxidizing atmosphere and then cooled at a cooling rate of at least 300° C./hr.
Claim 4
Dependent Claim
82 words
An abrasive-resistive, high-permeability magnetic alloy consisting essentially of 6-9 wt. % of Si, 7-11 wt. % of Al, 2-5 wt. % of Cr, 0.5-2 wt. % of Ti, 0.02-0.3 wt. % of at least one member selected from the group consisting of P and C, and the balance of Fe which has been heated at a temperature between 850° C. and 1,100° C. for 0.5-3 hours in a non-oxidizing atmosphere and then cooled at a cooling rate of at least 300° C./hr.
Claim 5
Dependent Claim
22 words
The abrasion-resistive, high permeability magnetic alloy as defined in claim 2 which has been cooled at a cooling rate of 300°-10,000° C./hour.
Claim 6
Dependent Claim
53 words
A magnetic head which comprises a core of an alloy, said alloy consisting of 6-9 wt. % of Si, 7-11 wt. % of Al, 2-5 wt.% of Cr, 0.5-2 wt.% of Ti, 0.02-0.3 wt.% of at least one member selected from the group consisting of P and C, and the balance of Fe.
Claim 7
Dependent Claim
53 words
A magnetic head which comprises a core of an alloy, said alloy consisting of 6-9 wt. % of Si, 7-11 wt. % of Al, 2-5 wt.% of Cr, 0.5-2 wt.% of Ti, 0.02-0.3 wt.% of at least one member selected from the group consisting of P and C, and the balance of Fe.
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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |