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. 23, 1987
Filed:
Feb. 11, 1985
Philip M Anderson, Chatham, NJ (US);
Richard C Ujazdowski, Flemington, NJ (US);
Jeffrey C Urbanski, Sparta, NJ (US);
Allied Corporation, Morris Township, Morris County, NJ (US);
Abstract
A unit and method are provided for the short range scanning of magnetic markers. The scanning unit includes an antenna adapted to provide a narrow interrogation field of short overall range. Control circuitry is provided for establishing the applied magnetic interrogation field and detecting and processing the response signal of the marker. A light emitting diode then provides a signal to the operator indicating whether a response signal is received from the marker being interrogated. The scanning unit is also equipped with a ferromagnetic plate of high magnetic coercivity for producing a dc bias field and activating the marker.