US4950550A
Expired / Lapsed
US
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Composite member for generating voltage pulses
Assignee: Vacuumschmelze GmbH and Co KG
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Filing: 1989-06-12
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Granted: 1990-08-21
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Expires: 2009-06-12
Abstract
Abstract A composite member particularly suited for anti-theft security systems is composed of a core of soft-magnetic material having a nickel-iron alloy (in weight percent) of 55 through 82 nickel, 0 through 4 molybdenum, the remainder iron, or an aluminum-iron alloy having 5 through 16% aluminum, the remainder iron, with a cobalt-vanadium-iron alloy or a cobalt-chromium-iron alloy envelope for the composite member.
Inventors
- 👤 Christian Radeloff
- 👤 Gerd Rauscher
- 👤 Hans Warlimont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:13
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2402; G08B13/2405; G08B13/2408; G08B13/2411; G06; G06K; G06K7/00; G06K7/08; G06K7/082; G06K7/083; G08B13/2428; G08B13/2437; G08B13/2442; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0304; H01F3/00; H01F3/10; H01F2003/106; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12937; Y10T428/12944
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
119 words
A composite marker element for generating a voltage pulse in the presence of a detection field, said marker element comprising: a soft-magnetic alloy core having a composition in weight percent of 55-82 nickel, 0-4 molybdenum, the remainder iron including melt-conditioned impurities; a hard-magnetic alloy jacket surrounding said core having a composition selected from the group consisting of a Co-V-Fe alloy having a composition 48-52 cobalt, 4-14 vanadium, the remainder iron including melt-conditioned impurities, and a Co-Cr-Fe alloy having a composition 21-30 chromium, 4-23 cobalt, 0.3 molybdenum, 0-1.5 silicon, the remainder iron including melt-conditioned impurities; and said core and said jacket having been mechanically stressed relative to each other by exposure to a temperature in the range of 500°-900° C.
Claim 2
Dependent Claim
119 words
A composite marker element for generating a voltage pulse in the presence of a detection field, said marker element comprising: a soft-magnetic alloy core having a composition in weight percent of 55-82 nickel, 0-4 molybdenum, the remainder iron including melt-conditioned impurities; a hard-magnetic alloy jacket surrounding said core having a composition selected from the group consisting of a Co-V-Fe alloy having a composition 48-52 cobalt, 4-14 vanadium, the remainder iron including melt-conditioned impurities, and a Co-Cr-Fe alloy having a composition 21-30 chromium, 4-23 cobalt, 0.3 molybdenum, 0-1.5 silicon, the remainder iron including melt-conditioned impurities; and said core and said jacket having been mechanically stressed relative to each other by exposure to a temperature in the range of 500°-900° C.
Claim 3
Dependent Claim
62 words
A composite marker element as claimed in claim 1, wherein each of said jacket and said core has a cross-section and a remanence induction, and wherein the ratio of the cross-section of the jacket to the cross-section of the core is greater than 0.8 times the ratio of the remanence induct on of the core to the remanence induction of the jacket.
Claim 4
Dependent Claim
19 words
A composite marker element as claimed in claim 1, having a length less than or equal to 50 mm.
Claim 5
Dependent Claim
54 words
A composite marker element as claimed in claim 1, wherein said marker has a length such that the magnetic field strength at which the Barkhausen discontinuity of said marker occurs is in a range between half the saturation field strength of its demagnetizing field through twice the saturation field strength of its demagnetizing field.
Claim 6
Dependent Claim
16 words
A composite marker element as claimed in claim 1, wherein said marker is in wire form.
Claim 7
Dependent Claim
16 words
A composite marker element as claimed in claim 1, wherein said marker is in strip form.
Claim 8
Dependent Claim
66 words
A composite marker element as claimed in claim 1, wherein said jacket and said core each have a cross-section and a remanence, and wherein said marker has a ratio of the cross-sections of the jacket and the core which in combination with the remanence of the jacket and the core causes the Barkhausen discontinuity to occur at a field strength having a maximum of 5 A/cm.
Claim 9
Dependent Claim
60 words
A composite marker element as claimed in claim 1, wherein said jacket has a cross-section and a remanence, and wherein said cross-section of said jacket in said marker is selected in combination with the remanence of said jacket in its magnetized condition such that the Barkhausen discontuity for said marker occurs at a field strength between 1 and 2 A/cm.
Claim 10
Dependent Claim
33 words
A composite marker element as claimed in claim 1, wherein said marker has a Iongitudinal axis and wherein said jacket is demagnetizeable by a magnetic field oriented perpendicularly relative to said longitudinal axis.
Claim 11
Dependent Claim
117 words
A composite marker element for generating a voltage pulse in the presence of a detection field, said marker element comprising: a soft-magnetic alloy core having a composition in weight percent of 5-16 aluminum, the remainder iron including melt-conditioned impurities; a hard-magnetic alloy jacket surrounding said core having a composition selected from the group consisting of a Co-V-Fe alloy having a composition 48-52 cobalt, 4-8 vanadium, the remainder iron including melt-conditioned impurities, and a Co-Cr-Fe alloy having a composition 21-30 chromium, 4-23 cobalt, 0-3 molybdenum, 0-1.5 silicon, the remainder iron including melt-conditioned impurities; and said core and said jacket having been mechanically stressed relative to each other by exposure to a temperature in the range of 500°-700° C.
Claim 12
Dependent Claim
117 words
A composite marker element for generating a voltage pulse in the presence of a detection field, said marker element comprising: a soft-magnetic alloy core having a composition in weight percent of 5-16 aluminum, the remainder iron including melt-conditioned impurities; a hard-magnetic alloy jacket surrounding said core having a composition selected from the group consisting of a Co-V-Fe alloy having a composition 48-52 cobalt, 4-8 vanadium, the remainder iron including melt-conditioned impurities, and a Co-Cr-Fe alloy having a composition 21-30 chromium, 4-23 cobalt, 0-3 molybdenum, 0-1.5 silicon, the remainder iron including melt-conditioned impurities; and said core and said jacket having been mechanically stressed relative to each other by exposure to a temperature in the range of 500°-700° C.
Claim 13
Dependent Claim
61 words
A composite marker element as claimed in claim 10, wherein each of said jacket and said core has a cross-section and a remanence induction, and wherein the ratio of the cross-section of the jacket to the cross-section of the core is greater than 0.8 times the ratio of the remanence induction of the core to the remanence induction of the jacket.
Claim 14
Dependent Claim
19 words
A composite marker element as claimed in claim 10, having a length less than or equal to 50 mm.
Claim 15
Dependent Claim
54 words
A composite marker element as claimed in claim 10, wherein said marker has a length such that the magnetic field strength at which the Barkhausen discontinuity of said marker occurs is in a range between half the saturation field strength of its demagnetizing field through twice the saturation field strength of its demagnetizing field.
Claim 16
Dependent Claim
16 words
A composite marker element as claimed in claim 10, wherein said marker is in wire form.
Claim 17
Dependent Claim
16 words
A composite marker element as claimed in claim 10, wherein said marker is in strip form.
Claim 18
Dependent Claim
66 words
A composite marker element as claimed in claim 10, wherein said jacket and said core each have a cross-section and a remanence, and wherein said marker has a ratio of the cross-sections of the jacket and the core which in combination with the remanence of the jacket and the core causes the Barkhausen discontinuity to occur at a field strength having a maximum of 5 A/cm.
Claim 19
Dependent Claim
60 words
A composite marker element as claimed in claim 10, wherein said jacket has a cross-section and a remanence, and wherein said cross-section of said jacket in said marker is selected in combination with the remanence of said jacket in its magnetized condition such that the Barkhausen discontuity for said marker occurs at a field strength between 1 and 1 a/cm.
Claim 20
Dependent Claim
33 words
A composite marker element as claimed in claim 10, wherein said marker has a longitudinal axis, and wherein said jacket is demagnetizeable by a magnetic field oriented perpendicularly relative to said longitudinal axis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |