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. 14, 1981
Filed:
Aug. 30, 1979
Applicant:
Inventor:
Tadashi Takaya, Kyoto, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R / ; G08B / ;
U.S. Cl.
CPC ...
179179 ; 1791 / ; 1791 / ; 3403 / ;
Abstract
A piezoelectric buzzer comprises: a piezoelectric transducer; a casing comprising a hollow body having one end closed by a perforated end wall, a lid adapted to close the other end of the hollow body, and an annular groove defined on the inner peripheral surface of the open end of the hollow body for loosely receiving the peripheral portion of the lid. The annular groove and the lid are so dimensioned and so shaped as to avoid any undesired suppression of the frequency of resonance of the casing which takes place during vibration of the transducer.