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:
Jul. 29, 1980
Filed:
Mar. 31, 1978
Peter Horowitz, Silver Spring, MD (US);
Intex Inc., Bethesda, MD (US);
Abstract
A merchandise tagging technique includes a transmitter and receiver module, called hereinafter the interrogator, located at the merchandise inspection point. When a piece of merchandise containing an activated tag passes in the vicinity of the interrogator, an alarm signal occurs. The transmitter produces a pulsed magnetic field which excites the tag. The magnetic oscillations produced by the tag are detected by the receiver-each tag magnetic burst being coherently accumulated. The tag is a small, passive, magnetically-permeable core with a winding on it which results in a self resonant structure that produces magnetic oscillations when excited by the transmitter. These oscillations are detected by the receiver and processed for optimal enhancement during the residence time of tagged merchandise passing by the interrogator. The tags can be small and mass-produced at low cost, which makes this scheme an economically valuable technique. Besides merchandise protection, the tag can be used on persons, vehicles and the like for the purpose of selective detection or identification.