US Patent 7189673 Dielectric material

Patent 7189673 was granted and assigned to NGK SPARK PLUG CO on March, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

NGK SPARK PLUG CO

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7189673

Date of Patent

March 13, 2007

Patent Application Number

10968052

Date Filed

October 20, 2004

Patent Primary Examiner

‌

Karl Group

Patent abstract

A dielectric material containing at least one of Ca and Sr, Ti, Al, at least one of Nb and Ta, and O, wherein these elements fulfill the following four requirements when represented by a compositional formula, aM1O-bTiO2-(½)cAl2O3-(½)dM22O5 wherein M1 represents the at least one of Ca and Sr; M2 represents the at least one of Nb and Ta; and a, b, c and d represent each a molar ratio, provided that a+b+c+d=1: 0.436<a≦0.500; 0.124<b≦0.325; 0.054<c≦0.150; and 0.170<d<0.346.