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. 10, 2010
Filed:
Mar. 28, 2008
Noriyuki Nakaoka, Yasugi, JP;
Shinichiroh Yokoyama, Tokyo, JP;
Yoshiyuki Fujihara, Yasugi, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
An object of the present invention is to solve the problem in hot workability caused by Cu aggregation and provide semi-hard magnetic materials having good magnetic properties, bias materials for magnetic markers, magnetic markers and production methods of bias materials for magnetic markers. The present invention provides a semi-hard magnetic material including 2.0%≦Cu≦10.0% and 0.1%≦Nb≦5.0% by mass %, the balance being Fe and inevitable impurities, and having a microstructure in which Cu phase and an intermetallic compound of Fe and Nb are dispersed. The semi-hard magnetic material of the present invention is suitable as bias materials for magnetic markers. Furthermore, the bias materials for magnetic markers can be formed by disposing bias materials for magnetic markers mentioned above so that a bias magnetic field may be applied to a magnetostrictive element for a magnetic marker.