Radio frequency identification transponder
First Claim
1. A radio-frequency identification (“
- RFID”
) transponder, the RFID transponder including;
a volatile memory array for storing first data;
a power supply for powering circuitry associated with the RFID transponder, including the volatile memory array;
wherein when power ceases to be provided to the volatile memory array by the power supply, data in the volatile memory array is validly maintained therein for a predetermined time period;
wherein the volatile memory array is responsive to an interrogating signal for selectively updating the first data; and
wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array.
10 Assignments
0 Petitions
Accused Products
Abstract
A radio frequency identification transponder including a power supply and a dynamic memory array which stores data. When power from the power supply ceases the data in the dynamic memory array is validly maintained for a predetermined period of time. The dynamic memory array is responsive to an interrogating signal for selectively updating the data. Further claimed is a radio frequency identification transponder wherein a signal processor extracts an identifier from the interrogation signal and is responsive to the identifier and the stored data to determine whether some or all of the identifier is stored in the dynamic memory array. Further claimed is a system wherein a transmitter provides a plurality of temporally spaced interrogating signals which are received by a receiver which incorporates a signal processor that is able to determine the order in which transponders were first in receipt of the interrogating signal. Further claimed is a baggage handling system wherein a transmitter provides a plurality of temporally spaced interrogating signals into an interrogating space through which a conveyor sequentially progresses baggage, a receiver receives transponder response signals which include baggage identity data, a signal processor then extracts the identity data and determines the order in which the baggage has progressed through the interrogating space.
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Citations
15 Claims
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1. A radio-frequency identification (“
- RFID”
) transponder, the RFID transponder including;a volatile memory array for storing first data; a power supply for powering circuitry associated with the RFID transponder, including the volatile memory array; wherein when power ceases to be provided to the volatile memory array by the power supply, data in the volatile memory array is validly maintained therein for a predetermined time period; wherein the volatile memory array is responsive to an interrogating signal for selectively updating the first data; and wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- RFID”
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13. A method of using a radio-frequency identification (“
- RFID”
) transponder, the method including the steps of;storing data in a volatile memory array included within the RFID transponder; powering circuitry associated with the RFID transponder, including the volatile memory array, with a power supply; validly maintaining the data in the volatile memory array for a predetermined time period after power ceases to be provided to the volatile memory array by the power supply; being responsive to an interrogating signal for selectively updating the first data; and wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array. - View Dependent Claims (14, 15)
- RFID”
Specification