Encodable tag with radio frequency readout

US5554974A · kind A · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Michael John Brady · Brewster, US
• Praveen Chaudhari · Briarcliff Manor, US
• Richard J. Gambino · Yorktown Heights, US
• Harley Heinrich · Snohomish, US
• Paul A. Moskowitz · Yorktown Heights, US
• Robert J. von Gutfeld · New York, US

Key dates

• Filing date: Nov 23, 1994
• Grant date: Sep 10, 1996
• Expiry date: Nov 23, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/12493
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A programmable tag for being readable remotely and in a manner which does not require that the tag be held in a particular orientation, includes a first layer of material with electron spin resonance absorption, a second layer of hard magnetic material, and a third layer of soft permeable magnetic material. The second layer and third layer are in close proximity to the first layer. The second layer and the third layer impose a magnetic bias field on the first layer.