Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2005-09-20
2005-09-20
Horabik, Michael (Department: 2635)
Communications: electrical
Selective
Interrogation response
C340S010340, C340S572100, C340S010200, C340S010400, C340S005650, C340S870030, C455S107000
Reexamination Certificate
active
06946950
ABSTRACT:
In a mobile body discrimination apparatus having an interrogator apparatus and a plurality of transponders each capable of transmitting information to the interrogator apparatus by modulation of radio waves that are reflected from a transponder antenna, which can be attached to respective articles, store data concerning the articles, and transmit the data to the interrogator apparatus in response to a command signal transmitted while the transponder traverses a communication region of an antenna of the interrogator apparatus, each transponder is configured to begin sending such response data after a randomly determined time interval following reception of the command signal, thereby reducing the probability of data conflict when plural transponders are within the communication region. In addition, radio waves from a second antenna of the interrogator apparatus are directed into that communication region in the intervals between transmissions of the command signal, thereby increasing the power level of radio waves that are reflected by a transponder antenna or used by a rectifier circuit to supply power for operating the transponder circuits.
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Fujita Suguru
Ikeda Shinkichi
Maeda Ken-ichi
Sangawa Ushio
Ueno Shinichiro
Brown Vernal
Horabik Michael
Parkhurst & Wendel L.L.P.
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