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:
Sep. 20, 2005
Filed:
Jul. 12, 2000
Shinichiro Ueno, Machida, JP;
Suguru Fujita, Tokyo, JP;
Shinkichi Ikeda, Komae, JP;
Kenichi Maeda, Tokyo, JP;
Ushio Sangawa, Sagamihara, JP;
Shinichiro Ueno, Machida, JP;
Suguru Fujita, Tokyo, JP;
Shinkichi Ikeda, Komae, JP;
Kenichi Maeda, Tokyo, JP;
Ushio Sangawa, Sagamihara, JP;
Abstract
In a mobile body discrimination apparatus having an interrogator apparatus and a plurality of transponders each capable of transmitting information to the interrogator apparatus by modulation of radio waves that are reflected from a transponder antenna, which can be attached to respective articles, store data concerning the articles, and transmit the data to the interrogator apparatus in response to a command signal transmitted while the transponder traverses a communication region of an antenna of the interrogator apparatus, each transponder is configured to begin sending such response data after a randomly determined time interval following reception of the command signal, thereby reducing the probability of data conflict when plural transponders are within the communication region. In addition, radio waves from a second antenna of the interrogator apparatus are directed into that communication region in the intervals between transmissions of the command signal, thereby increasing the power level of radio waves that are reflected by a transponder antenna or used by a rectifier circuit to supply power for operating the transponder circuits.