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:
Aug. 25, 1987
Filed:
Mar. 15, 1985
William C Tait, Oak Park Heights, MN (US);
Richard R Lemberger, Forest Lake, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A deactivatable marker for use in an RF electronic article surveillance system is disclosed, which marker includes a resonant circuit having at least one inductive component and one capacitive component. The circuit further comprises a component having two conductive layers separated only by an insulative thin-film which breaks down when at least a predetermined potential is applied across it to form a conductive path which changes the resonant frequency of the circuit. The two conductive layers are preferably configured to form a spiral multi-turn inductor and capacitor pads on opposing surfaces of a dielectric sheet, and to be embossed at a localized area, thereby contacting the layers except for the presence of the insulating thin-film.