Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2011-08-09
2011-08-09
Chan, Wing F (Department: 2441)
Communications: electrical
Selective
Interrogation response
C340S010200, C709S212000
Reexamination Certificate
active
07994899
ABSTRACT:
In an information access system, a first reader/writer device cyclically transmits an information request signal at a first frequency in a first period and goes into an inactive state in a second period, and a second reader/writer device cyclically transmits an information request signal at the first frequency in the second period and goes into an inactive state in the first period. An active contactless information storage device senses a carrier of an RF signal at the first frequency in predetermined periods occurring in a predetermined cycle shorter than each of the first and second periods.
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Notice of Allowance mailed Jan. 21, 2009 in U.S. Patent No. 7,536,152, issued May 19, 2009.
Inano Satoshi
Itasaki Akira
Shiotsu Shinichi
Yamada Isamu
Chan Wing F
Fujitsu Limited
Katsikis Kostas
Staas & Halsey , LLP
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