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:
Jan. 29, 2013
Filed:
Feb. 16, 2010
Machiko Motoya, Kusatsu, JP;
Tsutomu Tatekawa, Otsu, JP;
Jun Urakawa, Omihachiman, JP;
Tsuyoshi Katsube, Yasu, JP;
Yoichi Moriya, Kyoto, JP;
Machiko Motoya, Kusatsu, JP;
Tsutomu Tatekawa, Otsu, JP;
Jun Urakawa, Omihachiman, JP;
Tsuyoshi Katsube, Yasu, JP;
Yoichi Moriya, Kyoto, JP;
Murata Manufacturing Co., Ltd., Nagaokakyo-Shi, Kyoto-fu, JP;
Abstract
To provide a ceramic composition not only having little compositional variation after burning, but a high flexural strength of the sintered body, and a high Q value in a microwave band, a ceramic composition used for forming a ceramic layer of a multi-layer ceramic substrate contains 47.0 to 67.0 wt. % of SiO, 21.0 to 41.0 wt. % of BaO, and 10.0 to 18.0 wt. % of AlO, and contains as a first additive, 1.0 to 5.0 parts by weight of CeO, relative to a total of 100 parts of SiO, BaO and AlO, and as a second additive, 2.5 to 5.5 parts by weight of MnO, relative to a total of 100 parts by weight of SiO, BaO, AlOand CeO, and is substantially free of Cr. As a third additive, at least one of Zr, Ti, Zn, Nb, Mg and Fe, and as a fourth additive, a Co component and/or a V component, may be contained.