Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2011-04-19
2011-04-19
Brown, Vernal U (Department: 2612)
Communications: electrical
Selective
Interrogation response
C340S505000, C340S870180
Reexamination Certificate
active
07928832
ABSTRACT:
A method of operating a first RFID read/write device and at least one second RFID read/write device is disclosed herein. The first and second RFID read/write devices respectively comprise an RF part and a baseband part with a digital signal processor. The first and second RFID read/write devices are arranged at a usable wireless transmission distance from one another. The method comprises generating a Reader Service Signal in its baseband form in the signal processor and combining the Reader Service Signal with an RFID signal in its baseband form comprising a carrier signal, so that the RFID signal has the Reader Service Signal embedded to it in amplitude, frequency or phase. Thereafter, the RFID signal with the embedded Reader Service Signal is shifted into an RF band and the RFID signal is transmitted as a transmission signal wirelessly by the RFID read/write devices. The transmission signal from the first RFID read/write device is received by a number of electronic tags for the purpose of communicating with the first RFID read/write device. Simultaneously, the transmission signal from the first RFID read/write device is received at least by the one second RFID read/write device for the purpose of communicating with the first RFID read/write device.
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International Search Report; International Application No. PCT/2005/000430, European Patent Office, mailed Oct. 28, 2005, 2 pages.
Brown Vernal U
Intermec IP Corp.
Perkins Coie LLP
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