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. 16, 1997
Filed:
Aug. 27, 1996
Akira Hiraishi, Kanazawa, JP;
Katsuhiro Ikada, Kanazawa, JP;
Abstract
A surface acoustic-wave resonator filter having improved group delay time characteristics. The filter comprises three energy-confined acoustic-wave resonator filter sections formed on a piezoelectric substrate. The second resonator filter section is positioned between the first and third resonator filter sections. One frequency in a vertical higher-order mode of the second filter section is placed on the lower-frequency side of one frequency in a vertical higher-order mode of the first and third filter sections. Or, one frequency in a vertical lower-order mode of the second filter section is placed on the higher-frequency side of one frequency in a vertical lower-order mode of the first and third filter sections.