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. 02, 1992
Filed:
Oct. 15, 1991
Takeshi Matsumoto, Yokohama, JP;
Yuji Suzuki, Yokohama, JP;
Tokai Metals Co., Ltd., Kanagawa, JP;
Abstract
A resonant tag carries a plurality of resonant circuits having different resonant frequencies. The resonant circuit is composed of a first conductive pattern formed by a conductive metal foil on one surface of an insulating thin film and a second conductive pattern formed by a conductive metal foil on the other surface of the insulating thin film. The first conductive pattern contains an inductor element and an element of the capacitor, which correspond to a resonant frequency of the resonant circuit. The second conductive pattern contains the other element of the capacitor element. The capacitor element of the second conductive pattern, which corresponds to the resonant frequency, is disposed at a position where it faces the capacitor element of the first conductive pattern formed on one surface of the insulating thin film. When the resonant tag is used, the conductive metal foils formed on the two surfaces of the insulating synthetic resin film are electrically connected so as to turn off part of the resonant circuits, so that the resonant tag can be identified by a combination of resonant frequencies inherent in the remaining resonant circuits. For example, n (two or more) resonant circuits having different resonant frequencies may be formed on a resonant tag so that the tag can be identified in 2.sup.n -1 (or 2.sup.n) different ways.