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. 26, 2010
Filed:
Dec. 13, 2005
Takaaki Koizumi, Nagoya, JP;
Hirofumi Yamaguchi, Komaki, JP;
Iwao Ohwada, Nagoya, JP;
Tsutomu Nanataki, Toyoake, JP;
Takaaki Koizumi, Nagoya, JP;
Hirofumi Yamaguchi, Komaki, JP;
Iwao Ohwada, Nagoya, JP;
Tsutomu Nanataki, Toyoake, JP;
NGK Insulators, Ltd., Nagoya-Shi, JP;
Abstract
A method of producing a dielectric layer made of a polycrystalline dielectric material having anisotropy in the coefficient of thermal expansion is provided, including the steps of providing a raw material powder, and heat treating the raw material powder at least to a temperature sufficient to cause a phase change from a first crystal orientation at room temperature to a different crystal orientation to provide an aggregate of oriented raw material particles having the same chemical composition as the raw material powder but having the different crystal orientation. The method also includes a step of forming a compact from the aggregate of oriented raw material particles, including a step of applying a shearing force to the aggregate and firing the compact to form the dielectric layer.