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. 12, 1983
Filed:
Mar. 16, 1981
Applicant:
Inventors:
Michihiro Torii, Hamamatsu, JP;
Kohei Hirukawa, Kosai, JP;
Hiroshi Urata, Aichi, JP;
Shinichi Suzuki, Hamamatsu, JP;
Assignee:
Fuji Electrochemical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B / ; H01L / ;
U.S. Cl.
CPC ...
3403 / ; 3403 / ; 340692 ; 367167 ; 367172 ; 1161 / ; 116D / ; 1791 / ; 331 78 ; 310322 ;
Abstract
A piezoelectric audible sound generator having a feedback type piezoelectric transducer, an amplifier, and a phase compensator for adjusting the phase shift due to the combination of a bias resistance of the amplifier and equivalent capacitance of the piezoelectric transducer.