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:
Dec. 07, 2004
Filed:
Dec. 17, 2003
Applicant:
Inventors:
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
H01G 4/06 ; C04B 3/548 ; C04B 3/546 ;
U.S. Cl.
CPC ...
H01G 4/06 ; C04B 3/548 ; C04B 3/546 ;
Abstract
A dielectric ceramic includes a principal component which contains Ba, Ca and Ti and which has a perovskite structure represented by the general formula ABO ; additive components containing, for example, La and Mn; and a sintering aid, wherein crystal grains of the dielectric ceramic contain Ca, and the intergranular variation in the average Ca concentration within each grain is about 5% or more, in terms of CV value, or the ratio of the number of crystal grains in which the intragranular variation in the Ca concentration is about 5% or more, in terms of CV value, to the total number of crystal grains containing Ca is about 10% or more. A monolithic ceramic capacitor fabricated using the dielectric ceramic is also disclosed.