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US4657604A Expired / Lapsed US ⏱️ 0.0 years remaining

Fine amorphous metal wires

Assignee: Unitika Ltd
•
Filing: 1986-07-28
•
Granted: 1987-04-14
•
Expires: 2006-07-28
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Abstract

Abstract A fine amorphous metallic wire having a circular cross section and stability to a bias magnetic field, said wire being composed of an alloy having the following composition formula (Co.sub.1-a-b Fe.sub.a M.sub.b).sub.100-x-y Si.sub.x B.sub.y wherein M is at least one element selected from Cr, Mo, Ni, Nb, Ta, Pd, Pt, and Cu, x<20 atomic %, 7 atomic %≦y<35 atomic %, 7 atomic %<x+y≦35 atomic %, 0.01≦a≦0.1, and 0.001≦b≦0.05. The fine amorphous metallic wire has low magnetostriction, high magnetic permeability, high saturation magnetic flux density, and excellent toughness, and is stable against a bias magnetic field. Hence, it can be used as a material for electromagnetic devices such as a coordinate reading device, a current sensor, an eddy current sensor, a magnetic sensor, or a displacement sensor.

Inventors

  • 👤 Isamu Ogasawara
  • 👤 Kiyotsugu Maekawa
  • 👤 Hiroyuki Tomioka
  • 👤 Shinji Furukawa

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 04:18
CPC Classifications
C; C22; C22C; C22C45/00; C22C45/04

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 63 words
A fine magnetic amorphous metal wire having a circular cross section and stability to a bias magnetic field, said wire being composed of an alloy having the composition formula (Co.sub.1-a-b Fe.sub.a M.sub.b).sub.100-x-y Si.sub.x B.sub.y wherein M is at least one element selected from Cr, Mo, Ni, Nb, Ta, Pd, Pt, and Cu, x<20 atomic%, 7 atomic%≦y<35 atomic%, 7 atomic%<x+y≦35 atomic%, 0.01≦a≦0.1, and 0.001≦b≦0.05.
Claim 2
Dependent Claim 63 words
A fine magnetic amorphous metal wire having a circular cross section and stability to a bias magnetic field, said wire being composed of an alloy having the composition formula (Co.sub.1-a-b Fe.sub.a M.sub.b).sub.100-x-y Si.sub.x B.sub.y wherein M is at least one element selected from Cr, Mo, Ni, Nb, Ta, Pd, Pt, and Cu, x<20 atomic%, 7 atomic%≦y<35 atomic%, 7 atomic%<x+y≦35 atomic%, 0.01≦a≦0.1, and 0.001≦b≦0.05.
Claim 3
Dependent Claim 21 words
A fine magnetic amorphous metal wire as in claim 1, wherein b is at least 0.003 but not more than 0.04.
Claim 4
Dependent Claim 23 words
A fine magnetic amorphous metal wire as in claim 1, wherein x+y is at least 15 atomic% but not more than 32 atomic%.
Claim 5
Dependent Claim 24 words
A fine magnetic amorphous metal wire as in claim 1, wherein y is at least 7.5 atomic % but not more than 25 atomic%.
Claim 6
Dependent Claim 20 words
A fine magnetic amorphous metal wire as in claim 1, wherein the wire has a circularity of at least 60%.
Claim 7
Dependent Claim 20 words
A fine magnetic amorphous metal wire as in claim 1, wherein the wire has a circularity of at least 80%.
Claim 8
Dependent Claim 20 words
A fine magnetic amorphous metal wire as in claim 1, wherein the wire has a circularity of at least 90%.
Claim 9
Dependent Claim 23 words
A fine magnetic amorphous metal wire as in claim 1, wherein said wire has a V H value of not more than 1.5.
Claim 10
Dependent Claim 23 words
A fine magnetic amorphous metal wire as in claim 1, wherein said wire has a V H value of not more than 1.2.
Claim 11
Dependent Claim 23 words
A fine magnetic amorphous metal wire as in claim 1, wherein said wire has a V H value of not more than 0.75.

References Cited (Backward Citations)

US4420348A Cited
US4523626A Cited
US4527614A Cited
EP0050479A1 Cited
US4517017A Cited
US4488195A Cited
US4473417A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-04-13 1990-10-13 1991-04-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-04-13 1994-10-13 1995-04-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-04-13 1998-10-13 1999-04-14 $7700.00 Window Closed / Lapsed

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