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:
Feb. 08, 1977
Filed:
Jul. 09, 1975
Kouji Houkawa, Kodaira, JA;
Fujio Ishihara, Mito, JA;
Abstract
An elastic surface wave filter is disclosed which is composed of a substrate for the propagation thereon of elastic surface waves and transmitting and receiving transducers, each having at least an electrode deposited on the major surface of the substrate and in which the transmitting and receiving transducers are disposed line connectin the major surface of the substrate a predetermined distance apart from each other; the electrode of one or both of the transmitting and receiving transducers is formed with first and second comb-shaped electrodes; and the first and second electrodes are disposed with each electrode element of the latter extending between adjacent ones of the electrode elements of the former. The electrode elements of the first and/or second comb-shaped electrodes are weighted in terms of length and the extent of the region of overlapping of the first and second comb-shaped electrodes in a first direction, i.e. parallel to a line connecting the transmitting and receiving transducers, is the same at any point in a second direction perpendicular to the first direction.