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. 20, 2004
Filed:
Aug. 23, 2002
Hisashi Kobayashi, Tokyo, JP;
Tomoko Uchida, Tokyo, JP;
Shigeki Sato, Tokyo, JP;
Takeshi Nomura, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A dielectric ceramic composition comprising a main component composed of barium titanate, a first subcomponent including an oxide of AE (note that AE is at least one element selected from Mg, Ca, Ba and Sr), and a second subcomponent including an oxide of R (note that R is at least one element selected from Y, Dy, Ho and Er), wherein ratios of the subcomponents to 100 moles of the main component are, the first subcomponent: 0 mole<the first subcomponent<0.1 mole, and the second subcomponent: 1 mole<the second subcomponent<7 moles. According to the composition, a high specific permittivity can be attained, an insulation resistance lifetime can be maintained, the capacity-temperature characteristic can satisfy the X8R characteristic of the EIA standard, and firing in a reducing atmosphere can be realized.