Allied Corporation

Allied Chemical Corporation

Wayne H Witte

Gregory J Sellers

Sheldon Kavesh

Gerald R Bretts

Dirk A Timan

A magnetic theft detection system marker is adapted to generate magnetic fields at frequencies that (1) are harmonically related to an incident magnetic field applied within an interrogation zone and (2) have selected tones that provide the marker with signal identity. The marker is an elongated, ductile strip of amorphous ferromagnetic material having a composition defined by the formula Fe.sub.a Cr.sub.b C.sub.c P.sub.d Mo.sub.e Cu.sub.f B.sub.g Si.sub.h where 'a' ranges from about 63-81 atom %, 'b' ranges from about 0-10 atom %, 'c' ranges from about 11-16 atom %, 'd' ranges from about 4-10 atom %, 'e' ranges from about 0-2 atom %, 'f' ranges from about 0-1 atom %, 'g' ranges from about 0-4 atom % and 'i' ranges from about 0-2 atom %, with the proviso that the sum (c+d+g+h) ranges from 19-24 atom % and the fraction [c/(c+d+g+h)] is less than about 0.84.

Amorphous antipilferage marker

Efficient electromagnetic shielding envelopes made of wound metallic glass filaments are disclosed. They are made by winding the filaments around a suitably shaped mandrel and embedding the filaments in a matrix. These shielding envelopes have high shielding ratios at low magnetic fields and are easily manufactured.

Growing community of inventors

Martinsville, NJ, United States of America

Wayne H Witte