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. 11, 2004
Filed:
Jul. 25, 2002
Applicant:
Inventors:
Shugo Ohtsuki, Ibaraki, JP;
Takeshi Shimada, Ukyo-ku Kyoto, JP;
Kazuhiro Nishikawa, Nagaokakyio, JP;
Kazuya Toji, Mishima-gun Osaka, JP;
Kazuhiro Kura, Hirakata, JP;
Assignee:
Sumitomo Special Metals Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 3/547 ;
U.S. Cl.
CPC ...
C04B 3/547 ;
Abstract
A dielectric ceramic composition for microwave use having a relative permittivity &egr;r of 35 to 45, Qf value of more than 50,000 GHz (at 7 GHz), and dielectric characteristic of &tgr;f=0±10 ppm/° C includes an La O .Al O .SrO.TiO based ceramic composition and a specific quantity of Ga O to increase the Qf value and a specific amount of Pr O to control the &tgr;f value.