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:
Dec. 03, 2002
Filed:
Aug. 18, 2000
Takashi Hiramatsu, Shiga-ken, JP;
Jun Ikeda, Omihachiman, JP;
Hiroyuki Wada, Shiga-ken, JP;
Yukio Hamaji, Otsu, JP;
Abstract
A dielectric ceramic material containing BaTiO as a primary component and a rare earth element as an additional component, wherein the material satisfies the relation 0.7≦M/N so as to make the density of the rare earth metal uniform between crystal grains, and the material satisfies the relation 0.8≦L/M so as to make the density of the rare earth metal uniform in a crystal grain. In these relations, M represents the number of crystal grains satisfying the relation 0.5≦D /D; N represents the number of crystal grains constituting the ceramic material; and L represents the number of crystal grains satisfying the relations 0.5≦D /D and S /D ≦0.3, wherein D represents the mean density of the rare earth element in an arbitrary crystal grain i, D represents the mean density of the rare earth element in the entirety of the ceramic material, and S represents the standard deviation of the density of the rare earth element in the crystal grain i.