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:
May. 07, 2002
Filed:
Sep. 07, 2000
Hiroaki Matoba, Moriyama, JP;
Harunobu Sano, Kyoto, JP;
Abstract
A dielectric ceramic composition comprises 100 parts by weight of a primary constituent, about 0.1 to 25 parts by weight of a first secondary constituent comprising a SiO -based glass not containing lead oxide, and about 20 parts by weight or less of a second secondary constituent comprising manganese oxide (MnO). The primary constituent is represented by the formula x(Ba Ca Sr )O-y[(TiO ) (ZrO ) ]-zRe O wherein x+y+z=100 on a molar basis, &agr;+&bgr;+&ggr;=1, 0≦&bgr;+&ggr;≦0.8, 0<m<0.15, and Re is at least one rare earth element. The mole fraction (x, y, z) of (Ba Ca Sr )O, (TiO ) (ZrO ) , and Re O lies within a range surrounded by points in a ternary diagram, depending on the content of the ceramic capacitors. The dielectric ceramic composition can be sintered at low temperatures and exhibits a high specific dielectric constant and a high Q value. The dielectric ceramic composition is suitable for monolithic ceramic components such as monolithic ceramic capacitors and monolithic LC filters.