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. 02, 2007
Filed:
May. 19, 2004
Takafumi Kawano, Ube, JP;
Koichi Fukuda, Ube, JP;
Takafumi Kawano, Ube, JP;
Koichi Fukuda, Ube, JP;
UBE Industries, Ltd., Yamaguchi, JP;
Abstract
A dielectric ceramic composition having a relative dielectric constant εof 15-25 allowing formation of a laminated ceramic part having an appropriate size, capable of being sintered at a temperature lower than 800-1000° C. allowing incorporation and lamination of low resistance conductor of Cu or Ag through simultaneous sintering, and having a low dielectric loss tan δ (high Q-value) and a temperature coefficient τof resonant frequency has an absolute value not larger than 50 ppm/° C. The dielectric ceramic composition contains 3-30 parts by weight of lead-free low melting point glass containing 50 to 75 wt % of ZnO, 5 to 30 wt % of BO, 6 to 15 wt % of SiO, 0.5 to 5 wt % of AlO, and 3 to 10 wt % of BaO, based on 100 parts by weight of major component expressed by a general formula of x'ZnTiO-(1−x′−y′)ZnTiO-y′TiOwhere 0.15<x′<0.8 and 0≦y′≦0.2