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:
May. 24, 1988
Filed:
Jun. 12, 1987
Abstract
A dielectric ceramic composition consists essentially of a basic component composed of 35 to 70 wt % of SrTiO.sub.3, 0.5 to 16 wt % of MgTiO.sub.3, 1.0 to 12 wt % of CaTiO.sub.3, 5 to 32 wt % of Bi.sub.2 O.sub.3 and 5 to 16 wt % of TiO.sub.2, and additives composed of CuO, MnO.sub.2 and CeO.sub.2. The contents of the additives per 100 parts by weight of the main component are 0.05 to 1.0 parts by weight for CuO, 0.02 to 0.5 parts by weight for MnO.sub.2, and 1.0 to 8.0 parts by weight for CeO.sub.2, respectively. The composition possesses a high dielectric constant of more than 500, a high Q value of more than 1000 at 1 MHz, a small temperature change rate of capacitance of a maximum of -7.2% at +85.degree. C., and a small change rate of capacitance with direct current voltage.