Radio frequency identification transponder
First Claim
Patent Images
1. A radio-frequency identification (“
- RFID”
) transponder, the RFID transponder comprising;
a memory adapted to store data;
a power supply adapted to power the memory;
wherein, when power ceases to be provided to the memory, the data is maintained therein for a predetermined time period;
wherein the predetermined time period is determined by controlled discharge of the memory; and
wherein the predetermined time period is determined by discharging of the memory through stray leakage paths within the memory.
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Accused Products
Abstract
A radio frequency identification transponder includes a power supply and a dynamic memory array that 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. A radio frequency identification transponder includes a signal processor that 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.
101 Citations
104 Claims
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1. A radio-frequency identification (“
- RFID”
) transponder, the RFID transponder comprising;a memory adapted to store data; a power supply adapted to power the memory; wherein, when power ceases to be provided to the memory, the data is maintained therein for a predetermined time period; wherein the predetermined time period is determined by controlled discharge of the memory; and wherein the predetermined time period is determined by discharging of the memory through stray leakage paths within the memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
- RFID”
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61. A method of storing data in a radio-frequency identification (“
- RFID”
) transponder adapted for use in an RFID system, the method comprising the steps of;storing data in a memory of the RFID transponder; providing a first power supply associated with the memory; validly maintaining the data in the memory for a predetermined time period after power ceases to be provided to the memory by the first power supply; and wherein the predetermined time period is determined by discharging of the memory through stray leakage paths within the memory. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86)
- RFID”
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87. A radio-frequency identification (“
- RFID”
) transponder for use in an RFID system, the transponder comprising;a temporary memory array for storing data; a first power supply for powering circuitry associated with the RFID transponder, including the temporary memory array; wherein the RFID transponder is configured such that, when power ceases to be provided to the temporary memory array by the first power supply, the data in the temporary memory array is validly maintained therein for a predetermined time period; and wherein the temporary memory array comprises DRAM, and the predetermined time period is determined by discharging of the temporary memory array through stray leakage paths within the temporary memory array. - View Dependent Claims (88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104)
- RFID”
Specification