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:
Oct. 20, 2009
Filed:
Jan. 13, 2005
Takashi Tanaka, Tokyo, JP;
Takashi Tanaka, Tokyo, JP;
LSI Japan Co., Ltd., Shibuya-Ku, Tokyo, JP;
Abstract
Locations of IC tags affixed to items are automatically recognized without requiring interrogators or antennas are allocated at respective inventory locations. To attain this object, interrogatorfirstly transmits a unique ID readout command specifying read range, and corresponding IC tagssequentially reply their unique IDs (Xa), (Xb), (Xc) respectively. At the same time, interrogatortransmits a probe signal send out command specifying ID, and corresponding IC tagssequentially send out probe signals respectively. IC tagthat detects a probe signal with reception strength more than a predetermined level stores in its memory IDs (Xa), (Xb), (Xc) that interrogatorspecified as adjacent ID. Then, interrogatortransmits an adjacent ID readout command specifying ID, and corresponding IC tagssequentially reply adjacent IDs (Xb), (Xa.Xc), (Xb) stored in their memory respectively. Lastly, all possible combinations (Xa-Xb), (Xb-Xa), (Xb-Xc), (Xc-Xb) of unique IDs (Xa), (Xb), (Xc) and adjacent IDs (Xb), (Xa.Xc), (Xb) that controllerhas collected via interrogatorare obtained and any identical combinations are excluded so that (Xa-Xb), (Xb-Xc) remain as final combinations, and the final combinations having one side in common are joined to produce a link pattern of ID information. Thus, it is understood that IC tagsexist in the same communication area B, and are arranged in order of