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:
Feb. 07, 2006
Filed:
Jul. 15, 2002
Takashi Oba, Mie, JP;
Masahiko Matsumiya, Aichi, JP;
Akifumi Tosa, Aichi, JP;
Kazuhisa Itakura, Komaki, JP;
Takashi Oba, Mie, JP;
Masahiko Matsumiya, Aichi, JP;
Akifumi Tosa, Aichi, JP;
Kazuhisa Itakura, Komaki, JP;
NGK Spark Plug Co., Ltd., Nagoya, JP;
Abstract
A dielectric ceramic material is represented by the following compositional formula, (100-a)[Ba{(ZnCoNb}O]-a[MTaO], where M represents at least one species selected from K, Na, and Li. In one method, the dielectric material is produced by mixing raw material powders such that proportions by mol of component metals simultaneously satisfy the relations, 0.5≦a≦25; 0.98≦u≦1.03; 0≦v≦1; 0.274≦w≦0.374; 0.646≦x≦0.696; 0.5≦y≦2.5; and 0.8≦z≦1.2. The method further includes subjecting the resultant mixture to primary pulverization; calcining the resultant powder at 1,100-1,300° C., followed by wet secondary pulverization; drying the resultant paste; granulating; molding the resultant granules to thereby yield a compact; and firing the compact in air advantageously at 1,400-1,600° C.