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:
Oct. 09, 2001
Filed:
May. 22, 2000
Isamu Yoshizawa, Omihachiman, JP;
Katsuhiro Horikawa, Shiga-ken, JP;
Abstract
A piezoelectric ceramic material able to form a piezoelectric ceramic sintered body having such characteristics as a small electromechanical coupling coefficient, small resonant resistance and small temperature dependency of the resonant frequency that is required for designing a narrow-band filter is represented by principal component of the general formula of (Pb,Sr,)(Zr,Ti,Mn,Nb,)O,and having a composition satisfying the following relations of 0.93≦a≦1.01, 0.01≦b≦0.04, 0.37≦c≦0.47, 0.48≦d≦0.58, 0.0105≦e≦0.06, 0.02≦f≦0.06 and 1.05≦2e/f≦2, and comprising sub-components of about 0.003% to 0.1% by weight of each of SiO,and Al,O,relative to the principal component.