Title: Magnetomechanical electronic article surveillance marker with low-coercivity bias element
Application Number: 97197519 Application Date: 1997.08.21
Publication Number: 1228862 Publication Date: 1999.09.15
Approval Pub. Date: 2003.12.10 Granted Pub. Date: 2003.12.10
International Classifi-cation: G08B13/181
Applicant(s) Name: Sensor Electronics Corp. Address:
Inventor(s) Name: Richard L. Copeland;Kevin R. Coffey
Attorney & Agent: wang sibeng
Abstract:
    The invention provides a material used to form a biasing element (16) for a magnetomechanical EAS marker (10) has a coercivity that is lower than the coercivity of biasing elements used in conventional magnetomechanical markers. The marker (10) formed with the low coercivity material can be deactivated by applying an AC magnetic field at a level that is lower than is required for deactivation of conventional markers (curve 26). The marker (10) with the low coercivity bias element (16) can also be deactivated when at a greater distance from a deactivation device that was previously practical.
Time: 8