The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 2013
Filed:
Apr. 30, 2009
Shinichi Shiotsu, Kawasaki, JP;
Isamu Yamada, Kawasaki, JP;
Satoshi Inano, Kawasaki, JP;
Hideki Tanaka, Kawasaki, JP;
Daisuke Yamashita, Kawasaki, JP;
Shinichi Shiotsu, Kawasaki, JP;
Isamu Yamada, Kawasaki, JP;
Satoshi Inano, Kawasaki, JP;
Hideki Tanaka, Kawasaki, JP;
Daisuke Yamashita, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An information access system includes a reader/writer device and an information storage device. In the information storage device, a receiver unit senses a carrier of an RF signal at a first frequency for detection, in a first time period occurring at time intervals, and receives an information request signal in response to detection of a carrier of an RF signal at the first frequency, and senses a carrier of an RF signal at a second frequency in response to reception of the information request signal. In the storage device, a control causes the receiver unit to sense a carrier of an RF signal at the first frequency for detection, in a second time period after a sleep time period which is shorter than the time interval, in response to non-detection by the receiver unit of a carrier of an RF signal at the first frequency in the first time period.