Anti-shoplifting system
Patent 4800369 Issued on January 24, 1989. Estimated Expiration Date: 
October 15, 2006. 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.
October 15, 2006. 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 3493955 3713133 Alarm and locking device to prevent theft of an article Patent #: 4211995 InventorsApplicationNo. 06/918919 filed on 10/15/1986US Classes:340/568.2, Signal-carrying conduit between sensor and article (e.g., cable, power cord, or data link)340/571, Alarm on protected article340/572.7Specified antenna structureExaminersPrimary: Swann, III, Glen R.Attorney, Agent or FirmInternational ClassG08B 13/24 (20060101)AbstractAnti-shoplifting system comprising a switching circuit, a signal generator, and a detector gate. Said switching circuit has a built-in flat-shaped miniature power pack which is attached to individual goods sold in shops and switches on and maintains the circuit of said power pack switched on under the action of external radiowaves. The signal generator consists of a built-in signal-transmitting circuit for transmitting radio signals of a specific frequency from said power supply. The detector gate is provided with a signal-generating state forming a weak radiowave area of the required frequency to energize the switching circuit of said signal generator and receives the radiowaves transmitted from said signal generator so as to drive an alarm device via said received signals.Field of SearchAlarm on protected article | |
