Tracking systems, passive RFIDs, methods of locating and identifying RFIDs, and methods of tracking items
First Claim
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1. A tracking system, comprising:
- a plurality of interrogators;
a plurality of RFIDs, said plurality of RFIDs including a first subset of the RFIDs and a second subset of the RFIDS;
a first of said plurality of interrogators and said first subset of RFIDs configured for selective interrogation of the first subset of the RFIDs, said first subset of the RFIDs being configured to change a first observable property responsive to interrogation; and
a second of said plurality of interrogators and said second subset of RFIDs configured for selective interrogation of the second subset of the RFIDs, said second subset of the RFIDs being configured to change a second observable property responsive to interrogation, wherein at least one RFID is configured to display shipping information responsive to interrogation by an interrogator.
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Abstract
Some embodiments include observable properties triggered upon interrogation of RFIDs. The RFIDs can be passive RFIDs, and the observable properties can be visible changes that require little power to generate, and little or no power to maintain. The visible information can include information about items tracked with the RFIDs, such as shipping information. Some embodiments include passive RFIDs utilizing a single antenna to power an integrated-circuit chip and a visual identifier. Some embodiments include methods of locating interrogated RFIDs. Some embodiments include methods of tracking items.
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Citations
22 Claims
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1. A tracking system, comprising:
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a plurality of interrogators; a plurality of RFIDs, said plurality of RFIDs including a first subset of the RFIDs and a second subset of the RFIDS; a first of said plurality of interrogators and said first subset of RFIDs configured for selective interrogation of the first subset of the RFIDs, said first subset of the RFIDs being configured to change a first observable property responsive to interrogation; and a second of said plurality of interrogators and said second subset of RFIDs configured for selective interrogation of the second subset of the RFIDs, said second subset of the RFIDs being configured to change a second observable property responsive to interrogation, wherein at least one RFID is configured to display shipping information responsive to interrogation by an interrogator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of locating particular RFIDs within a group of RFIDs, comprising:
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providing a system comprising a plurality of RFIDs, and comprising an interrogator configured to interrogate a first subset of the RFIDs responsive thereto without interrogating a second subset of RFIDs within the group, said first subset of the RFIDs being configured to change an observable property responsive to interrogation; simultaneously exposing the first and second subsets of the RFIDs to interrogation by said interrogator to cause the RFIDs of the first subset to change the observable property; and distinguishing the RFIDs exhibiting the changed observable property from the RFIDs not exhibiting a change in the observable property to locate the first subset of the RFIDs; providing a set of RFIDs associated with items; interrogating the RFIDs to cause the RFIDS to display shipping information pertaining to the associated items. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification