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:
Aug. 06, 1991
Filed:
Oct. 12, 1990
Robert A Woolley, Uxbridge, GB;
Thorn EMI plc, London, GB;
Abstract
An electromagnetic article, such as a responder tag for detection by an electronic article surveillance (EAS) system, is fabricated by forming a deposit of a relatively low coercivity high permeability magnetic material on a substrate 22 under the influence of an applied magnetic field so as to provide the deposit with easy and hard axes of magnetization. During deposition the substrate is subjected to a mechanical tension 32 so as to provide the deposit with an inherent benign strain substantially aligned with one of the axes of magnetization. The inherent benign strain is arranged to dominate any detrimental strain to which the responder tag may be subjected during use, enabling detection by the EAS system to be maintained.