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:
Nov. 30, 1999
Filed:
Jul. 06, 1998
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
A dielectric ceramic composition is comprised of a crystal structure phase of a tungsten bronze form, one titanate-barium phase or more titanate-barium phases selected from Ba.sub.2 Ti.sub.9 O.sub.20, BaTi.sub.2 O.sub.5, BaTi.sub.4 O.sub.9 and Ba.sub.4 Ti.sub.13 O.sub.30, and a fine crystal phase comprising an oxide of each of at least B, Ag and Mn, in which the crystal structure phase of the tungsten bronze form is formed with a limited amount of a compound oxide of Ba, Nd and Ti as a basic component and contains a limited amount of each of an oxide of at least Bi, Pb, Zn and Si. The dielectric ceramic composition can be fired at a temperature of 920.degree. C. or lower and sintered forming into a ceramic electronic part which has remarkably high dielectric characteristics, such as the dielectric constant of 60 or higher, the Q factor of 1,000 or higher, and the temperature coefficient .tau..epsilon.r of the relative dielectric constant .epsilon.r of .+-.60 ppm/.degree. C. or smaller. The ceramic electronic parts for high frequency are further provided with high electrical features and prepared at low costs.