Radio frequency identification transponder
First Claim
Patent Images
1. A radio-frequency identification (“
- RFID”
) transponder for use in an RFID system, the RFID transponder comprising;
a volatile memory array for storing data;
a first power supply for powering circuitry associated with the RFID transponder, the circuitry comprising the volatile memory array;
wherein when power ceases to be provided to the volatile memory array by the first power supply, the data in the volatile memory array is validly maintained therein for a predetermined time period;
wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array; and
wherein the first power supply provides power by converting an electromagnetic excitation field into power.
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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.
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Citations
97 Claims
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1. A radio-frequency identification (“
- RFID”
) transponder for use in an RFID system, the RFID transponder comprising;a volatile memory array for storing data; a first power supply for powering circuitry associated with the RFID transponder, the circuitry comprising the volatile memory array; wherein when power ceases to be provided to the volatile memory array by the first power supply, the data in the volatile memory array is validly maintained therein for a predetermined time period; wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array; and wherein the first power supply provides power by converting an electromagnetic excitation field into power. - 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)
- RFID”
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31. An RFID system comprising:
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an RFID transponder comprising; a volatile memory array for storing data; a first power supply for powering circuitry associated with the RFID transponder, the circuitry comprising the volatile memory array; wherein when power ceases to be provided to the volatile memory array by the first power supply, the data in the volatile memory array is validly maintained therein for a predetermined time period; wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array; a transponder interrogator for providing an interrogation field and reading data from the RFID transponder; and wherein the first power supply provides power by converting an electromagnetic excitation field into power. - View Dependent Claims (32, 33, 34, 35, 36)
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37. 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 volatile memory array of the RFID transponder; providing a first power supply associated with the volatile memory array; 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 first power supply; wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array; and wherein the first power supply provides power by converting an electromagnetic excitation field into power. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
- RFID”
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49. A radio-frequency identification (“
- RFID”
) transponder, the RFID transponder comprising;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, the first 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; wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array; wherein the first power supply provides power by converting an externally-applied electromagnetic excitation field into electrical power; and wherein the first power supply provides power by converting an electromagnetic excitation field into power. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79)
- RFID”
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80. A method of using a radio-frequency identification (“
- RFID”
) transponder, the method comprising 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 data; wherein the predetermined time period is determined by discharging of the volatile memory array through stray leakage paths within the volatile memory array; and wherein the first power supply provides power by converting an electromagnetic excitation field into power. - View Dependent Claims (81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97)
- RFID”
Specification