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:
Jun. 15, 2004
Filed:
Nov. 06, 2001
Applicant:
Inventors:
Yoshihiro Takahashi, Tokyo, JP;
Tadaaki Tsuda, Tokyo, JP;
Yasushi Yamamoto, Tokyo, JP;
Hiroshi Kawahara, Tokyo, JP;
Assignee:
NRS Technologies, Inc., Hakodate, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 4/104 ; H01L 4/108 ; H01L 4/118 ; H02N 2/00 ;
U.S. Cl.
CPC ...
H01L 4/104 ; H01L 4/108 ; H01L 4/118 ; H02N 2/00 ;
Abstract
The present invention relates to a surface acoustic wave filter in which a plurality of pairs of comb electrode patterns are formed on an upper surface of a chip substrate made of a piezoelectric material. The surface acoustic wave filter includes a high-resistance pattern formed to surround a peripheral portion of the chip substrate on an upper surface side thereof, and a plurality of patterns formed to connect the high-resistance pattern to the respective comb electrode patterns.