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. 05, 2004
Filed:
Aug. 20, 2001
Takeshi Nomura, Tokyo, JP;
Shigeki Sato, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A method of production of a dielectric ceramic composition having at least a main component of Ba TiO , a second subcomponent including at least one compound selected from SiO , MO (where M is at least one element selected from Ba, Ca, Sr, and Mg), Li O, and B O , and other subcomponents, comprising the step of: mixing in said main component at least part of other subcomponents except for said second subcomponent to prepare a pre-calcination powder, calcining the pre-calcination powder to prepare a calcined powder, and mixing at least said second subcomponent in said calcined powder to obtain the dielectric ceramic composition having molar ratios of the subcomponents to the main component of predetermined ratios. As the other subcomponents, there is a third subcomponent including at least one compound selected from V O , MoO , and WO . A ratio of the third subcomponent to 100 moles of the main component is preferably 0.01 to 0.1 mole.