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:
Apr. 09, 1996
Filed:
Oct. 06, 1994
Applicant:
Inventor:
Kouichi Yamaguchi, Nagaokakyo, JP;
Assignee:
Murata Manufacturing Co., Ltd., Nagaokakyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ; H01F / ;
U.S. Cl.
CPC ...
336 83 ; 336212 ; 336215 ; 336233 ;
Abstract
A common mode choke coil has a couple of coils, a magnetic frame in which the coils are encased, the magnetic frame forming closed magnetic circuits around the respective coils, and a magnetic core which pierces through the magnetic frame. The frame is made of an insulating magnetic material which has a relative magnetic permeability of more than one, preferably two through some scores. For example, a mixture of ferrite powder of Ni--Zn and resin is used as the material of the frame. The core is made of a material which has a relative magnetic permeability of preferably several thousands, such as ferrite and amorphous.