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:
Jun. 02, 2009
Filed:
Aug. 29, 2005
Kazushige Ito, Chuo-ku, JP;
Akira Sato, Chuo-ku, JP;
Taku Murase, Chuo-ku, JP;
TDK Corporation, Tokyo, JP;
Abstract
A dielectric ceramic composition having a main ingredient including a dielectric oxide expressed by the formula {(MeCa)O}.(ZrTi)O, where the symbol Me indicating the name of the element in said formula is at least one of Sr, Mg, and Ba and where the symbols m, x, and y indicating the molar ratios of the formulation in the formula are in relationships of 0.995≦m≦1.020, 0<x≦0.15, and 0≦y≦1.00, a first sub ingredient including an oxide of R (where R is a rare earth element), a second sub ingredient including an oxide of Mg, and a third sub ingredient including an oxide of Mn, wherein the ratios of the sub ingredients with respect to 100 moles of the main ingredient are first sub ingredient: 0.1 to 6 moles (value converted to oxide of R), second sub ingredient: 0.1 to 5 moles (value converted to oxide of Mg), and third sub ingredient: 0.1 to 2.5 moles (value converted to oxide of Mn), said dielectric ceramic composition further having as a fourth sub ingredient an oxide of A (where A is at least one type of element selected from the group of anionic elements having an effective ion radius at the time of hexacoordination of 0.065 nm to 0.085 nm).