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. 22, 2000
Filed:
Jun. 30, 1998
Korea Advanced Institute of Science and Technology, Taejeon, KR;
Abstract
A microwave dielectric composition superior in all dielectric constant, product of resonant frequency by quality coefficient and temperature-dependent coefficient of resonant frequency, can be prepared by mixing a main oxide formulation consisting of lead oxide, calcium oxide, zirconium oxide and tin oxide with manganous nitrate (Mn(NO.sub.3).sub.2.4H.sub.2 O), calcining the mixture at a temperature of about 1,000 to 1,200.degree. C., pulverizing and molding the mixture, and sintering the molded body at a temperature of about 1,200 to 1,550.degree. C. in an oxygen atmosphere. It is 100 or greater in dielectric constant, 4,000 or greater in the product of resonant frequency by quality coefficient and .+-.3 mmp/.degree. C. or less in temperature-dependent coefficient of resonant frequency.