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:
May. 18, 2004
Filed:
Sep. 25, 2001
Norihisa Waki, Kanagawa-ken, JP;
Hideaki Ono, Kanagawa-ken, JP;
Munekatsu Shimada, Tokyo, JP;
Tatsuo Sugiyama, Kanagawa-ken, JP;
Nissan Motor Co., Ltd., Kanagawa-ken, JP;
Abstract
A bulk exchange-spring magnet , a method of producing the same, and a device incorporating the bulk exchange-spring magnet are disclosed. The magnet includes magnet powders having hard and soft phases, and boron and oxygen atoms which cohere in boundary areas between grains of the densified magnet powders . In a production method, the magnet powders are compacted so as to incorporate boron and oxygen atoms into the boundary areas and are heated under a compacted state of the magnet powders at varying operating temperatures for a given time period. This results in formation of a highly densified magnet at a lower potential operating temperature for a shorter time period without the grain growth. The device includes the bulk exchange-spring magnet containing the boron and oxygen atoms cohering between the grains of the densified magnet powders.