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:
Dec. 07, 2010
Filed:
Mar. 12, 2008
Applicants:
Masaki Takahashi, Tokyo, JP;
Seisuke Mochizuka, Tokyo, JP;
Michiyuki Nakazawa, Tokyo, JP;
Inventors:
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H 9/64 (2006.01);
U.S. Cl.
CPC ...
Abstract
Disclosed is a surface acoustic wave filter comprising two or more IDTs arranged in a propagation direction of the surface acoustic wave, wherein said two or more IDTs include at least one pair of IDTs arranged adjacent to each other in order to be acoustically coupled to each other, and have different numbers of paired electrode fingers, and a pitch between each neighboring two of almost all of the electrode fingers included in one of the pair of IDTs which has the smaller number of paired electrode fingers is made different from one to another in order that the IDTs should include no primary pitch area.