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:
Feb. 12, 2002
Filed:
Mar. 23, 2000
Gakuji Uozumi, Omiya, JP;
Osamu Ishihara, Omiya, JP;
Mitsubishi Materials Corporation, Tokyo, JP;
Abstract
An apparatus for identifying an article including an interrogator to enable a tag to be identified, even if the tag is overlapped with another tag or a metal plate. The tag is attached to the article, and a memory for storing data about the article is provided in an RFID element connected to an antenna coil of the tag. The tag is activated by transmitting a radio wave of a frequency with which the tag resonates from a transmitting/receiving antenna of the interrogator. Data is read from the memory in response to a reading command, and data is writing into the memory in response to a writing command from the interrogator. The interrogator also includes an oscillation circuit for sweeping a radio wave transmitted from the transmitting/receiving antenna over a predetermined frequency range. The predetermined frequency range is a frequency range which includes all resonance frequencies of a plurality of the tags that vary based on plurality of overlapped articles to which the tags are attached.