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:
Jun. 18, 2002
Filed:
Mar. 29, 2000
Hiroshige Ohkawa, Tokyo, JP;
Toshio Sakurai, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
There is disclosed a ceramics composition mainly comprising Ba-based glass and a quartz. The content of Ba-based glass is in a range of 55.0 to 69.4 wt %, the content of a quartz is in a range of 12.1 to 40.2 wt %, and the content of Al O is 24.5 wt % or less. For the components of Ba-based glass, in terms of oxides, the content of BaO is in a range of 19 to 29 mol %, the content of Si0 is in a range of 62 to 72 mol %, the content of Al O is in a range of 6 to 11 mol %, and the content of B O per the total of 100 mol of BaO, SiO and Al O is in a range of 3 to 7 mol. Therefore, the sintering can be performed at a temperature equal to or less than the melting point of Ag, Cu, or an alloy mainly containing Ag or Cu, dielectric constant is low, but linear expansion coefficient is high, and the co-firing can be realized with other dielectric material and magnetic material which can be sintered at a low temperature.