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:
Dec. 17, 1991
Filed:
Sep. 06, 1990
Masayuki Yamada, Takefu, JP;
Hiroaki Ichikawa, Yokohama, JP;
Tadashi Morimoto, Takefu, JP;
Yasuyuki Naito, Takefu, JP;
Hiroshi Takagi, Otsu, JP;
Harufumi Mandai, Takatsuki, JP;
Yukio Sakabe, Kyoto, JP;
Murata Mfg. Co., , JP;
Abstract
A dielectric ceramic composition consists essentially of 80 to 99.7 wt % of a main component of a system, SrTiO.sub.3 -PbTiO.sub.3 -CaTiO.sub.3 -Bi.sub.2 O.sub.3 -TiO.sub.2 -SnO.sub.2, at least one oxide of rare earth elements incorporated therein as an additive in an amount of 0.1 to 5.0 wt % in terms of Re.sub.2 O.sub.3 (where Re is at least one rare element selected from the group consisting of Nd, La, Ce, Pr and Sm), and 0.2 to 15 wt % of a vitreous component. The main component consists essentially of 20.0 to 50.0 wt % of SrTiO.sub.3, 8.0 to 37.6 wt % of PbTiO.sub.3, 3.2 to 33.9 wt % of CaTiO.sub.3, 4.4 to 35.2 wt % of Bi.sub.2 O.sub.3, 2.5 to 13.6 wt % of TiO.sub.2 and 0.2 to 12.0 wt % of SnO.sub.2. The vitreous component consists essentially of 10 to 45 mol % of Li.sub.2 O, 5 to 40 mol % of at least one oxide selected from the group consisting of BaO, MgO, CaO and SrO, 0.2 to 10 mol % of Al.sub.2 O.sub.3, 30 to 70 mol % of at least two oxide selected from the group consisting of SiO.sub.2, MnO.sub.2 and TiO.sub.2, the content of SiO.sub.2 in the vitreous component being not less than 15 mol % at least, and 1 to 35 mol % of CuO.