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:
Jul. 26, 2016
Filed:
Dec. 26, 2011
Yoshinori Kobayashi, Mishima-gun, JP;
Tsunehiro Kawata, Mishima-gun, JP;
Yoshinori Kobayashi, Mishima-gun, JP;
Tsunehiro Kawata, Mishima-gun, JP;
HITACHI METALS, LTD., Tokyo, JP;
Abstract
A sintered ferrite magnet having a main phase composed of ferrite having a hexagonal, M-type magnetoplumbite structure, a grain boundary phase containing Si and Ca with a lower atomic ratio of La than in said main phase, and a third phase containing La at a higher atomic ratio than in said main phase, and a method for producing a sintered ferrite magnet having said third phase by calcining starting materials with more La than Ca, adding more than 1% and 1.8% or less by mass of SiOand 1-2% by mass (calculated as CaO) of CaCOto the calcined body, and pulverizing, molding and sintering it.