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:
Jan. 13, 2015
Filed:
Nov. 23, 2011
Daisuke Yamashita, Kawasaki, JP;
Shinichi Shiotsu, Kawasaki, JP;
Hiroyasu Sugano, Kawasaki, JP;
Hideki Tanaka, Kawasaki, JP;
Daisuke Yamashita, Kawasaki, JP;
Shinichi Shiotsu, Kawasaki, JP;
Hiroyasu Sugano, Kawasaki, JP;
Hideki Tanaka, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An active contactless information storage device includes: an operation controller that determines whether mode information of the active contactless information storage device indicates a mode in which the device communicates with a reader/writer device; a carrier-sense controller that determines whether a first frequency in a first period and determines whether a second frequency in a second period, when the mode information of the active contactless information storage device indicates the mode in which the device communicates with the reader/writer device; and a command processor that performs communication with the reader/writer device when the carrier sense controller determines that the first frequency is sensed; wherein, when the mode information of the active contactless information storage device does not indicate the mode in which the active contactless information storage device communicates with the reader/writer device, the carrier-sense controller waits for a predetermined amount of time.