Amorphous antipilferage marker
First Claim
1. For use in a magnetic theft detection system, a marker adapted to generate magnetic fields at frequencies that are harmonically related to an incident magnetic field applied within an interrogation zone and have selected tones that provide said marker with signal identity, and retaining its signal identity after being flexed or bent, said marker comprising an elongated, ductile strip of amorphous ferromagnetic material having a composition consisting essentially of the formula Ma Nb Oc Xd Ye Zf, where M is at least one of iron and cobalt, N is nickel, O is at least one of chromium and molybdenum, X is at least one of boron and phosphorous, Y is silicon, Z is carbon, "a"-"f" are in atom percent, "a" ranges from about 35-85, "b" ranges from about 0-45, "c" ranges from about 0-2.5, "d" ranges from about 12-20.3, "e" ranges from about 0-13 and "f" ranges from about 0-2, and the sum of d+e+f ranges from about 15-25.
1 Assignment
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Accused Products
Abstract
A magnetic theft detection system marker is adapted to generate magnetic fields at frequencies that (1) are harmonically related to an incident magnetic field applied within an interrogation zone and (2) have selected tones that provide the marker with signal identity. The marker is an elongated, ductile strip of amorphous ferromagnetic material having a composition defined by the formula Ma Nb Oc Xd Ye Zf, where M is at least one of iron and cobalt, N is nickel, O is at least one of chromium and molybdenum, X is at least one of boron and phosphorous, Y is silicon, Z is carbon, "a"-"f" are in atom percent, "a" ranges from about 35-85, "b" ranges from about 0-45, "c" ranges from about 0-7, "d" ranges from about 5-22, "e" ranges from about 0-15 and "f" ranges from about 0-2, and the sum of d+e+f ranges from about 15-25.
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Citations
12 Claims
- 1. For use in a magnetic theft detection system, a marker adapted to generate magnetic fields at frequencies that are harmonically related to an incident magnetic field applied within an interrogation zone and have selected tones that provide said marker with signal identity, and retaining its signal identity after being flexed or bent, said marker comprising an elongated, ductile strip of amorphous ferromagnetic material having a composition consisting essentially of the formula Ma Nb Oc Xd Ye Zf, where M is at least one of iron and cobalt, N is nickel, O is at least one of chromium and molybdenum, X is at least one of boron and phosphorous, Y is silicon, Z is carbon, "a"-"f" are in atom percent, "a" ranges from about 35-85, "b" ranges from about 0-45, "c" ranges from about 0-2.5, "d" ranges from about 12-20.3, "e" ranges from about 0-13 and "f" ranges from about 0-2, and the sum of d+e+f ranges from about 15-25.
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6. In a magnetic theft detection system marker for generating magnetic fields at frequencies that are harmonically related to an incident magnetic field applied within an interrogation zone and have selected tones that provide said marker with signal identity, the improvement wherein:
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a. said marker comprising an elongated, ductile strip of amorphous ferromagnetic material having a composition consisting essentially of the formula Ma Nb Oc Xd Ye Zf, where M is at least one of iron and cobalt, N is nickel, O is at least one of chromium and molybdenum, X is at least one of boron and phosphorous, Y is silicon, Z is carbon, "a"-"f" are in atom percent, "a" ranges from about 35-85, "b" ranges from about 0-45, "c" ranges from about 0-2.5, "d" ranges from about 12-20.3, "e" ranges from about 0-13 and "f" ranges from about 0-2, and the sum of d+e+f ranges from about 15-25; and b. said marker retains its signal identity after being flexed or bent.
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7. A magnetic detection system responsive to the presence of an article within an interrogation zone, comprising:
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a. means for defining an interrogation zone; b. means for generating a magnetic field within said interrogation zone; c. a marker secured to an article appointed for passage through said interrogation zone, said marker comprising an elongated, ductile strip of amorphous ferromagnetic metal having a composition consisting essentially of the formula Ma Nb Oc Xd Ye Zf, where M is at least one of iron and cobalt, N is nickel, O is at least one of chromium and molybdenum, X is at least one of boron and phosphorous, Y is silicon, Z is carbon, "a"-"f" are in atom percent, "a" ranges from about 35-85, "b" ranges from about 0-45, "c" ranges from about 0-2.5, "d" ranges from about 12-20.3, "e" ranges from about 0-13 and "f" ranges from about 0-2, and the sum of d+e+f ranges from about 15-25, said marker being capable of producing magnetic fields at frequencies which are harmonics of the frequency of an incident field; d. detecting means for detecting magnetic field variations at selected tones of said harmonics produced in the vicinity of the interrogation zone by the presence of the marker therewithin, said selected tones providing said marker with signal identity and said marker retaining said signal identity after being flexed or bent.
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- 11. Fe-C-P glassy metal alloy. .Iaddend. .Iadd.19. A marker as recited in claim 11, said marker comprising at least one crystalline phase and at least one amorphous phase. .Iaddend. .Iadd.20. A marker as recited in claim 11, said marker comprising an amorphous ferromagnetic strip provided with at least one magnetizable element. .Iaddend. .Iadd.21. A marker as recited in claim 20, said marker comprising a plurality of hard magnetic chips. .Iaddend. .Iadd.22. A marker as recited in claim 21, said marker comprising an ordered pattern of said plurality of hard magnetic chips. .Iaddend. .Iadd.23. A marker as recited in claim 22, said marker comprising at least one ordered row of said plurality of hard magnetic chips. .Iaddend. .Iadd.24. A marker as recited in claim 11, said marker comprising a solid solution of said iron- or cobalt-based amorphous
Specification