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; and
wherein, when power ceases to be provided to the memory, the data is maintained therein for a predetermined time period.
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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.
104 Citations
109 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; and wherein, when power ceases to be provided to the memory, the data is maintained therein for a predetermined time period. - 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)
- RFID”
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49. 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; and 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. - 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)
- RFID”
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76. A radio-frequency identification (“
- RFID”
) transponder, the RFID transponder comprising;a temporary memory circuit that stores at least one bit of data; a power supply for powering at least the temporary memory circuit; wherein, when power ceases to be provided to the temporary memory circuit, the at least one bit of data is maintained therein for a predetermined time period; and wherein the temporary memory circuit comprises a data-storage capacitor and the data-storage capacitor receives no power from any other part of the RFID transponder responsive to power ceasing to be provided to the temporary memory circuit.
- RFID”
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77. A radio-frequency identification (“
- RFID”
) transponder, the RFID transponder comprising;a data-storage capacitor that stores at least one bit of data; a power supply coupled to the data-storage capacitor; wherein, when power ceases to be provided to the data-storage capacitor, the at least one bit of data in the data-storage capacitor is maintained therein for a predetermined time period; and wherein a first terminal of the data-storage capacitor is connected to ground and a second terminal of the data-storage capacitor is connected to a transistor.
- RFID”
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78. A radio-frequency identification (“
- RFID”
) transponder for use in an RFID system having a sequentially switched interrogation field resulting in a power outage consequential upon the sequential switching of the interrogation field, the power outage having a duration t, the transponder comprising;a first power supply for powering circuitry associated with the RFID transponder; a memory supplied with power by the first power supply; and wherein the memory is configured to hold data in a readable state within the memory for a finite period of time T following the power outage, and wherein the finite period of time T exceeds the duration t of the power outage. - View Dependent Claims (79)
- RFID”
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80. A method of storing data in a radio-frequency identification (“
- RFID”
) transponder adapted for use in an RFID system having a sequentially switched interrogation field, resulting in a power outage consequential upon the sequential switching of the interrogation field, the power outage having a duration t, the method comprising the steps of;providing a first power supply for powering circuitry associated with the RFID transponder; providing a memory supplied with power by the first power supply; and configuring the memory to hold data in a readable state within the memory for a finite period of time T following the periodic power outage, wherein the finite period of time T exceeds the duration t of the power outage. - View Dependent Claims (81, 82)
- RFID”
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83. 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; and 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. - View Dependent Claims (84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101)
- RFID”
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102. 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 temporary memory array included within the transponder; providing first powering circuitry associated with the RFID transponder, and the temporary memory array; validly maintaining the data in the temporary memory array for a predetermined time period after power ceases to be provided to the temporary memory array by the first power supply. - View Dependent Claims (103, 104, 105, 106, 107, 108, 109)
- RFID”
Specification