Monitoring tag with removal detection
June 16, 2015. 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 ReferencesRandomized tag to portal communication system Weight responsive intrusion detector using dual optical fibers Tag for use with personnel monitoring system House arrest monitoring system Tag for use with personnel monitoring system Personal locator transmitter Personal security apparatus Article theft detection apparatus Electronic article surveillance system with transition zone tag monitoring Fibre optic security and communications link Patent #: 5374921 InventorsAssigneeApplicationNo. 491449 filed on 06/16/1995US Classes:340/572.1, Detectable device on protected article (e.g., "tag")340/573.4, House arrest system, wandering, or wrong place340/600Radiant energyExaminersPrimary: Swann, GlenAttorney, Agent or FirmInternational ClassesG08B 013/187G08B 029/04 AbstractA tag is provided for being secured to an object whose location is to be monitored. Improved mechanisms are provided for ensuring that removal of the tag is detected and signaled to a monitoring system. One preferred embodiment of the tag of the present invention includes an optical sensor for sensing when the tag is near the surface of the object whose location is being monitored. The optical sensor emits optical signals to the surface of the object being monitored and receives reflected optical signals back therefrom. The tag periodically transmits status messages to the monitoring system which permit the monitoring system to determine whether the tag is being held near the object and whether the tag is within the monitored area. In another embodiment of the present invention, a temperature sensor is substituted for the optical sensor.Field of SearchRadiant energy | |
