US5268043A
Expired / Lapsed
US
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Magnetic sensor wire
Assignee: Olin Corp
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Filing: 1991-08-02
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Granted: 1993-12-07
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Expires: 2011-08-02
Abstract
Abstract There is provided a magnetic device having first and second portions with different magnetic coercivities. A magnetic field is induced in both the first and second portion. When exposed to a sufficiently high external magnetic field, the polarity of the first portion reverses generating a voltage pulse which may be detected by an external sensor. Either the first or second portion, or both, is formed from a copper alloy containing dispersed magnetic phase.
Inventors
- 👤 Charles J. McCowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:04
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/08; G06K7/082; G06K7/083; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0304; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465; Y10T428/12486; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/1291; Y10T428/12917
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
90 words
A magnetic device capable of generating a voltage pulse when passed through an external magnetic field, comprising: a first portion containing from about 5 to about 40% by weight iron, from about 5 to about 40% by weight nickel and the balance copper, said first portion having a magnetic phase dispersed in a predominantly copper matrix and having a first magnetic coercivity; and a second portion adjacent to said first portion, said second portion having a second magnetic coercivity, said second magnetic coercivity being greater than said first magnetic coercivity.
Claim 2
Dependent Claim
90 words
A magnetic device capable of generating a voltage pulse when passed through an external magnetic field, comprising: a first portion containing from about 5 to about 40% by weight iron, from about 5 to about 40% by weight nickel and the balance copper, said first portion having a magnetic phase dispersed in a predominantly copper matrix and having a first magnetic coercivity; and a second portion adjacent to said first portion, said second portion having a second magnetic coercivity, said second magnetic coercivity being greater than said first magnetic coercivity.
Claim 3
Dependent Claim
19 words
The magnetic device of claim 1 wherein said second portion is a separate material bonded to said first portion.
Claim 4
Dependent Claim
35 words
The magnetic device of claim 2 wherein said first portion further contains up to about 40% by weight of an addition selected from the group consisting of cobalt, chromium, zirconium, magnesium, manganese and mixtures thereof.
Claim 5
Dependent Claim
36 words
The magnetic device of claim 3 wherein the concentration of said iron is from about 8 to about 20% by weight and the concentration of said nickel is from about 8 to about 20% by weight.
Claim 6
Dependent Claim
43 words
The magnetic device of claim 4 wherein said first portion contains from about 10 to about 20% by weight iron, from about 10 to about 20% by weight nickel, an effective amount up to about 1% by weight magnesium and the balance copper.
Claim 7
Dependent Claim
40 words
The magnetic device of claim 5 wherein said first portion contains from about 12 to about 18% by weight nickel, from about 12 to about 18% by weight iron, from about 0.1 to about 0.4% magnesium and the balance copper.
Claim 8
Dependent Claim
41 words
The magnetic device of claim 4 wherein said first portion contains from about 8 to about 20% by weight iron, from about 8 to about 20% by weight nickel, an effective amount up to about 15% cobalt and the balance copper.
Claim 9
Dependent Claim
27 words
The magnetic device of claim 7 wherein said first portion contains 8-12% by weight iron, 8-12% by weight nickel, 8-12% by weight cobalt and the balance copper.
Claim 10
Dependent Claim
42 words
The magnetic device of claim 4 wherein said second portion contains from about 8 to about 20% by weight iron, from about 8 to about 20% by weight nickel and an effective amount up to about 1% magnesium and the balance copper.
Claim 11
Dependent Claim
42 words
The magnetic device of claim 9 wherein said second portion contains from about 12 to about 18% by weight nickel, from about 12 to about 18% by weight iron, from about 0.1 to about 0.4% by weight magnesium, and the balance copper.
Claim 12
Dependent Claim
43 words
The magnetic device of claim 4 wherein said second portion contains from about 8 to about 20% by weight iron, from about 8 to about 20% by weight nickel, an effective amount up to about 15% by weight cobalt and the balance copper.
Claim 13
Dependent Claim
42 words
The magnetic device of claim 11 wherein said second portion contains from about 8 to about 12% by weight iron, from about 8 to about 12% by weight nickel, from about 8 to about 12% by weight cobalt and the balance copper.
Claim 14
Dependent Claim
20 words
The magnetic device of claim 4 in the form of a wire with said second portion surrounding said first portion.
Claim 15
Dependent Claim
20 words
The magnetic device of claim 13 wherein the first portion has a magnetic polarity opposite that of said second portion.
Claim 16
Dependent Claim
23 words
The magnetic device of claim 4 in the form of a strip with said second portion adjacent both sides of said first portion.
Claim 17
Dependent Claim
20 words
The magnetic device of claim 15 wherein the first portion has a magnetic polarity opposite that of said second portion.
Claim 18
Dependent Claim
112 words
A magnetic device capable of generating a voltage pulse when passed through an external magnetic field, comprising: a first portion having a first magnetic coercivity; and a second portion bonded to said first portion, said second portion containing from about 5 to about 40% by weight iron, from about 5 to about 40% by weight nickel, up to about 40% by weight of an additive selected from the group consisting of cobalt, chromium, zirconium, magnesium, manganese and mixtures thereof, and the balance copper, said second portion having a magnetic phase dispersed in a predominantly copper matrix and a second magnetic coercivity, said second magnetic coercivity being greater than said first magnetic coercivity.
Claim 19
Dependent Claim
112 words
A magnetic device capable of generating a voltage pulse when passed through an external magnetic field, comprising: a first portion having a first magnetic coercivity; and a second portion bonded to said first portion, said second portion containing from about 5 to about 40% by weight iron, from about 5 to about 40% by weight nickel, up to about 40% by weight of an additive selected from the group consisting of cobalt, chromium, zirconium, magnesium, manganese and mixtures thereof, and the balance copper, said second portion having a magnetic phase dispersed in a predominantly copper matrix and a second magnetic coercivity, said second magnetic coercivity being greater than said first magnetic coercivity.
Claim 20
Dependent Claim
43 words
The magnetic device of claim 17 wherein said second portion contains from about 8 to about 20% by weight iron, from about 8 to about 20% by weight nickel, an effective amount up to about 1% by weight magnesium and the balance copper.
Claim 21
Dependent Claim
43 words
The magnetic device of claim 18 wherein said second portion has the composition of from about 12 to about 18% by weight nickel, from about 12 to about 18% by weight iron, from about 0.1 to about 0.4% magnesium and the balance copper.
Claim 22
Dependent Claim
43 words
The magnetic device of claim 17 wherein said second portion contains from about 8 to about 20% by weight iron, from about 8 to about 20% by weight nickel, an effective amount up to about 15% by weight cobalt and the balance copper.
Claim 23
Dependent Claim
36 words
The magnetic device of claim 20 wherein said second portion contains from about 8 to about 12% iron, from about 8 to about 12% nickel, from about 8 to about 12% cobalt and the balance copper.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |