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:
Apr. 12, 1977
Filed:
Dec. 12, 1974
Abstract
A piezoelectric ceramic resonator to be used for an electric wave filter or an impedance transformer, and a manufacturing method of the ceramic resonator of the above described type, is provided in which a piezoelectric ceramic wafer, held at nodes or points close to the nodes of the electrodes of the wafer between outer terminal plates, is dipped in a melt, or the like, of gap-forming materials to form a first layer of such materials on the resonator with a second layer of porous thermosetting resinous material formed on the surface of the first layer. The gap-forming materials forming the first layer is subsequently sublimated or evaporated and absorbed into the second layer to form a space between the resonator and the second layer with the resonator advantageously surrounded by the space for stable vibration.