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:
Jul. 24, 1984
Filed:
Apr. 11, 1983
Gen Itakura, Osaka, JP;
Takayuki Kuroda, Hyogo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A ceramic composition of a high dielectric constant is provided, which consists of 100 mol parts of barium metatitanate (BaTiO.sub.3), (2/3)(7.+-.1) mol parts of cerium dioxide, and 7.+-.1 mol parts of titanium dioxide (TiO.sub.2), and to which 0.05 to 0.2 mol part of MnO.sub.2 is added. The ceramic composition has a ceramic microstructure in which a grain size is as small as 2 to 3 .mu.m and a pore size is small to be not more than 3 .mu.m. The ceramic composition has a high dielectric constant of about 10,000, a high breakdown voltage, and little dependency on voltage. The ceramic composition is very suitable as a thin dielectric film for a laminated ceramic chip capacitor.