Magnetomechanical electronic article surveilliance marker with bias element having abrupt deactivation/magnetization characteristic
Patent 5729200 Issued on March 17, 1998. Estimated Expiration Date: 
August 28, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 28, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSurveillance system having magnetomechanical marker Coded surveillance system having magnetomechanical marker Transverse magnetic field annealed amorphous magnetomechanical elements for use in electronic article surveillance system and method of making same Magnetomechanical article surveillance marker with a tunable resonant frequency Patent #: 5495230 InventorsApplicationNo. 697629 filed on 08/28/1996US Classes:340/551, Disturbance of magnetic field340/572.6Having "soft" magnetic element (e.g., Permalloy)ExaminersPrimary: Swann, GlenAttorney, Agent or FirmInternational ClassG08B 023/181AbstractA material used to form a biasing element for a magnetomechanical EAS marker has a coercivity that is lower than the coercivity of biasing elements used in conventional magnetomechanical markers. The marker 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. The marker with the low coercivity bias element can also be deactivated when at a greater distance from a deactivation device than was previously practical.Field of SearchDisturbance of magnetic field | |
