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:
Apr. 16, 2013
Filed:
Jul. 01, 2011
Machiko Motoya, Nagaokakyo, JP;
Takahiro Sumi, Nagaokakyo, JP;
Machiko Motoya, Nagaokakyo, JP;
Takahiro Sumi, Nagaokakyo, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
In order to enable non-shrinkage firing, the strength of a multilayer ceramic substrate is increased by a method including alternately stacking a base material layer and a constrained layer which is not sintered at the sintering temperature for the base material layer, and allowing the material of the base material layer to flow into the constrained layer while subjecting the base material layer to sintering, thereby achieving densification of the constrained layer. The base material layer and the constrained layer each include celsian, and less celsian is provided in the base material layer than in the constrained layer. In order to increase the strength of the base material layer, the addition of a Ti component, rather than an increased content of Al component which interferes with sintering of the base material layer, causes fresnoite to be deposited in the base material layers.