Magnetic marker and manufacturing method therefor

Details Magnetic marker and manufacturing method therefor Magnetic marker and manufacturing method therefor

2005-03-08

2005-03-08

Lee, Benjamin C. (Department: 2632)

Communications: electrical

Condition responsive indicating system

Specific condition

C428S606000, C428S611000, C148S112000, C148S301000, C164S463000, C029S527500

Reexamination Certificate

active

06864793

ABSTRACT:
A magnetic marker comprises a magnetically switchable wire and a magnetic casing that covers the magnetically switchable wire. The magnetically switchable wire is formed of a magnetic material that undergoes occurrence of sharp magnetic inversion when an alternating field of intensity higher than its coercive force is applied to it. The magnetic casing is formed of a magnetically hard or semihard magnetic material and can apply a bias magnetic field to the magnetically switchable wire to prevent magnetic inversion of the magnetically switchable wire. Heat-treated portions and high-coercivity regions, which are not heat-treated, are formed alternately in the longitudinal direction on the magnetic casing. The heat-treated portions are given magnetic properties different from magnetic properties essential to the magnetic casing by heat treatment such as annealing.

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