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Alliedsignal Inc.

Allied Corporation

Robert M VonHoene

Ryusuke Hasegawa

Philip M Anderson, Iii

Carl H Smith

A process for making a large number of magneto-mechanically resonant markers having distinct resonant characteristics is disclosed. The process comprises modifying at least one surface of a glassy metal alloy strip so as to cause the effective length of the alloy strip to be different from the physical length thereof. Resonant markers comprising alloy strips treated by the process of the present invention display unique and distinguishable resonant characteristics which gives the marker a unique identity. The resonant markers can be used for article surveillance, inventory control and personnel identification.

Method of encoding and decoding a glassy alloy strip to be used as an

A magnetic core is fabricated from ferromagnetic metallic glass ribbon and mica paper insulation. The ribbon and insulation are co-wound, so that layers comprise alternate concentric rings. The wound core is then annealed in a vacuum or an inert atmosphere such as dry nitrogen or argon gas. Co-wound cores of this type exhibit excellent magnetic properties at high magnetization rates and high voltage hold off between adjacent laminations, and are particularly suited for pulse power applications.

Magnetic cores utilizing metallic glass ribbons and mica paper

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 value of magnetostriction near zero that retains its signal identity under stress.

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Basking Ridge, NJ, United States of America

Robert M VonHoene