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:
Feb. 23, 1993
Filed:
Jan. 22, 1992
Hisakazu Takahashi, Osaka, JP;
Yoko Baba, Osaka, JP;
Kenichi Ezaki, Osaka, JP;
Yasuhiko Okamoto, Osaka, JP;
Kenichi Shibata, Osaka, JP;
Kazuhiko Kuroki, Kyoto, JP;
Shigeyuki Yasuyama, Osaka, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A microwave dielectric ceramic composition which is obtained by selecting, in a composition formula of (A.sup.1+.sub.1/2 .multidot.B.sup.3+.sub.1/2) TiO.sub.3, Li.sup.1+ and Nd.sup.3+, Co.sup.3+ or Pr.sup.3+ as A.sup.1+ and B.sup.3+, respectively. The dielectric ceramic composition expressed by (A.sup.1+.sub.1/2 .multidot.B.sup.3+.sub.1/2) TiO.sub.3 has a high dielectric constant and has a temperature coefficient of resonance frequency .tau.f which is large on the minus side. MgO, CoO, ZnO, CaCO.sub.3 or SrCO.sub.3 is added to such a dielectric ceramic composition expressed by (A.sup.1+.sub.1/2 .multidot.B.sup.3+.sub.1/2 /TiO.sub.3, to improve the Q value of the dielectric ceramic composition.