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:
Mar. 10, 1987
Filed:
Feb. 25, 1986
Applicant:
Inventors:
Kiyoshi Nagai, Tokyo, JP;
Nobuyoshi Sakamoto, Tokyo, JP;
Assignee:
Oki Electric Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H / ; H03H / ;
U.S. Cl.
CPC ...
333196 ; 3103 / ; 333194 ;
Abstract
A surface-acoustic-wave filter is of a multi-transducer arrangement including a plurality of input interdigital transducers and a plurality of output interdigital transducers. These input and output transducers are alternately and parallelly disposed on a piezo-electric substrate so as to be spaced intercentral distances l.sub.1 through l.sub.n apart. When one of the intercentral distances is a reference distance l.sub.1, the respective intercentral distances l.sub.1 through l.sub.n satisfies the following relationships: