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:
Mar. 31, 2015
Filed:
Nov. 05, 2010
Yuichi Iida, Nagaokakyo, JP;
Yuichi Iida, Nagaokakyo, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
When a multilayer ceramic substrate with a cavity is reduced in thickness, a bottom wall portion defining the bottom of the cavity is reduced in thickness, thereby leading to the problem that the bottom wall portion is likely to be broken. A bottom wall portion defining a cavity of a multilayer ceramic substrate has a stack structure formed with a high thermal expansion coefficient layer sandwiched between first and second low thermal expansion coefficient layers. This configuration generates compression stress in the low thermal expansion coefficient layers during a cooling process after firing, thereby allowing the mechanical strength at the bottom wall portion to be improved.