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    • 2. 发明申请
    • Detecting a Departure of an RFID Tag from an Area
    • 从区域检测RFID标签的离开
    • US20080106411A1
    • 2008-05-08
    • US11556435
    • 2006-11-03
    • Donnie A. Smith
    • Donnie A. Smith
    • G08B13/14
    • G06Q10/08
    • A method of determining whether a radio frequency identifier (RFID) tag has been removed from an area can include, responsive to detecting an RFID tag in a first area, making an entry within a tag read cache associated with the first area. The entry within the tag read cache can include an identifier corresponding to the RFID tag and a timestamp indicating when the RFID tag was detected in the first area. A difference between a current time and the timestamp from the entry within the tag read cache can be calculated. An indication that the RFID tag is no longer in the first area can be provided if the difference exceeds a departure threshold.
    • 一种确定射频标识符(RFID)标签是否已经从区域移除的方法可以包括响应于检测第一区域中的RFID标签,在与第一区域相关联的标签读缓存器内进行条目。 标签读取缓存内的条目可以包括对应于RFID标签的标识符和指示在第一区域中何时检测到RFID标签的时间戳。 可以计算当前时间和来自标签读取高速缓存中的条目的时间戳之间的差异。 如果差异超过出发阈值,则可以提供RFID标签不再在第一区域中的指示。
    • 5. 发明授权
    • Detecting a departure of an RFID tag from an area
    • 从区域检测RFID标签的离开
    • US07671743B2
    • 2010-03-02
    • US11556435
    • 2006-11-03
    • Donnie A. Smith
    • Donnie A. Smith
    • G08B13/14
    • G06Q10/08
    • A method of determining whether a radio frequency identifier (RFID) tag has been removed from an area can include, responsive to detecting an RFID tag in a first area, making an entry within a tag read cache associated with the first area. The entry within the tag read cache can include an identifier corresponding to the RFID tag and a timestamp indicating when the RFID tag was detected in the first area. A difference between a current time and the timestamp from the entry within the tag read cache can be calculated. An indication that the RFID tag is no longer in the first area can be provided if the difference exceeds a departure threshold.
    • 一种确定射频标识符(RFID)标签是否已经从区域移除的方法可以包括响应于检测第一区域中的RFID标签,在与第一区域相关联的标签读缓存器内进行条目。 标签读取缓存内的条目可以包括对应于RFID标签的标识符和指示在第一区域中何时检测到RFID标签的时间戳。 可以计算当前时间和来自标签读取高速缓存中的条目的时间戳之间的差异。 如果差异超过出发阈值,则可以提供RFID标签不再在第一区域中的指示。
    • 6. 发明申请
    • RFID INVENTORY DEVICE
    • RFID存货设备
    • US20080157967A1
    • 2008-07-03
    • US11617002
    • 2006-12-28
    • Andrew R. JonesGregory J. BossDonnie A. SmithRick A. HamiltonKevin C. McConnell
    • Andrew R. JonesGregory J. BossDonnie A. SmithRick A. HamiltonKevin C. McConnell
    • G08B13/14
    • G06K17/00G01G15/00G01G19/42G01G23/3728G06K17/0029G06K19/0716
    • A radio frequency identification (RFID) inventory device attached to a container for tracking quantities of objects stored in the container having an antenna supporting wireless interrogation by an external RFID reader, a RFID chip coupled to the antenna having an embedded unique identifier and a memory element, where the RFID chip is adapted to store in the memory element at least one quantity value and to allow an external reader to wirelessly collect the identifier and at least one quantity value in response to said wireless interrogation, and one or more sensors coupled to the RFID chip, where the sensors are configured to send at least one signal to the RFID chip in response to a change in quantities of objects in the container and where the RFID chip is configured to update at least one quantity value stored in response to a signal from the sensors.
    • 一种连接到容器上的射频识别(RFID)清单装置,用于跟踪存储在具有外部RFID读取器的支持无线询问的天线的容器中的数量的对象,耦合到具有嵌入式唯一标识符的天线的RFID芯片和存储元件 ,其中所述RFID芯片适于在所述存储器元件中存储至少一个数量值,并且允许外部读取器响应于所述无线询问而无线地收集所述标识符和至少一个数量值,以及耦合到所述无线询问的一个或多个传感器 RFID芯片,其中传感器被配置为响应于容器中物体的量的变化而将至少一个信号发送到RFID芯片,并且其中RFID芯片被配置为更新响应于信号存储的至少一个数量值 从传感器。