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:
Oct. 08, 2002
Filed:
Mar. 01, 2001
Applicant:
Inventors:
Assignee:
Minebea Co., Ltd., Kitasaku-gun, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 3/526 ; C04B 3/538 ; C10G 4/900 ;
U.S. Cl.
CPC ...
C04B 3/526 ; C04B 3/538 ; C10G 4/900 ;
Abstract
The present invention provides a Mn—Zn ferrite having an electrical resistivity exceeding 1 &OHgr;m order and having a low core loss in a high frequency region exceeding 1 MHz. The basic component composition of the Mn—Zn ferrite includes 44.0 to 49.8 mol % Fe O , 6.0 to 15.0 mol % ZnO (15.0 mol % is excluded), 0.1 to 4.0 mol % at least one of TiO and SnO , and remainder MnO, wherein desired results are obtained by limiting Fe O content to less than 50 mol % that is the stoichiometric composition and adding a proper amount of TiO or SnO and further controlling its average grain size to less than 10 &mgr;m.