Theft detection apparatus and target and method of making same
Patent 4568921 Issued on February 4, 1986. Estimated Expiration Date: 
July 13, 2004. 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.
July 13, 2004. 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 References 3534243 3665449 3673437 3737735 3747086 3765007 3790945 3820103 3820104 Magnetic detection means InventorAssigneeApplicationNo. 06/630708 filed on 07/13/1984US Classes:340/572.3, Deactivatable by means other than mere removal340/572.6, Having "soft" magnetic element (e.g., Permalloy)428/900, MAGNETIC FEATURE428/916FRAUD OR TAMPER DETECTINGExaminersPrimary: Swann, III, Glen R.Attorney, Agent or FirmInternational ClassG08B 13/24 (20060101)AbstractItems of merchandise (30) are protected from shoplifting or theft by affixing to them, special responder targets (32), which are formed by drawing a material of high magnetic permeability into a thin wire, then heat treating the wire to substantially increase its magnetic permeability and thereafter severing the wire into individual lengths. Several wires (32a, 32b and 32c) may be positioned on a common adhesively coated base strip (42) and covered by a peel strip (46) and wire like deactivation elements (48) of hard magnetic material may be positioned adjacent the wires for deactivating them.Field of SearchDisturbance of magnetic field | |
