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. 20, 2002
Filed:
Jan. 26, 2001
Applicant:
Inventors:
Assignee:
Minebea Co., Ltd., Kitasaku-gun, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22F 1/00 ; C04B 3/526 ;
U.S. Cl.
CPC ...
B22F 1/00 ; C04B 3/526 ;
Abstract
The present invention provides a Mn—Zn ferrite having an electrical resistivity exceeding 1 &OHgr;m order and having a high initial permeability of 4000 or more at 100 kHz and 100 or more at 10 MHz. The main components of the Mn—Zn ferrite include 44.0 to 49.8 mol % Fe O , 15.0 to 26.5 mol % ZnO, 0.1 to 3.0 mol % CoO, 0.02 to 1.00 mol % Mn O , and the remainder MnO. The Mn—Zn ferrite can be used in a wide frequency region of 100 kHz to 10 MHz by limiting Fe O content to a range of less than 50 mol %, that is the stoichiometric composition, inhibiting formation of Mn O and adding a proper amount of CoO.