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:
Jul. 05, 1994
Filed:
Jun. 23, 1992
Yoshihiro Yamada, Tokyo, JP;
NEC Corporation, , JP;
Abstract
According to this invention, a weighting transducer for a surface acoustic wave filter includes first, second, third bus electrodes, odd-numbered transducer fingers, and even-numbered transducer fingers. The first, second, third bus electrodes are formed on a piezoelectric substrate. The odd-numbered transducer fingers are formed on the piezoelectric substrate and consist of first transducer fingers connected to the first bus electrode and second transducer fingers connected to the second bus electrode and spaced apart from the first transducer fingers by a predetermined interval in the longitudinal direction. The even-numbered transducer fingers are formed on the piezoelectric substrate, connected to the third bus electrode, and consist of third transducer fingers overlapping the first and second transducer fingers.