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:
Jun. 15, 2010
Filed:
Dec. 28, 2005
Makoto Aikawa, Sagamihara, JP;
Yutaka Takami, Yokohama, JP;
Shinichiro Fukushima, Yokohama, JP;
Masumi Moritani, Yokohama, JP;
Hashimoto Kazunori, Fujisawa, JP;
Makoto Aikawa, Sagamihara, JP;
Yutaka Takami, Yokohama, JP;
Shinichiro Fukushima, Yokohama, JP;
Masumi Moritani, Yokohama, JP;
Hashimoto Kazunori, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A hierarchical structure is established among a plurality of RFID tags, such that ID numbers can be read only from RFID tags which belong to a particular layer. RFID tag can control whether permission should be given to read its ID number therefrom to protect the ID number. Data held in the RFID tag can be read from the outside. RFID tag comprises a memory circuit having a function of holding data, and a logic circuit having a function of processing a control command received from outside. Memory circuit stores an own ID number for identifying the RFID tag itself, and a parent ID number for identifying a second RFID tag. When RFID tag receives an ID number read command which contains first data as a parameter from outside, the logic circuit outputs the own ID number to outside only when the first data matches the parent ID number.