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. 18, 1978
Filed:
Apr. 20, 1976
Applicant:
Inventors:
Philippe Henri Cluzel, Six Fours les Plages, FR;
Michel Georges Quivy, Six Fours les Plages, FR;
Assignee:
Etat Francais, Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
340 10 ; 340 / ;
Abstract
A piezoelectric transducer comprising a piezoelectric cylinder whose axis is coincident with the electrical axis and placed between two rigid pistons perpendicular to the axis and of greater diameter than that of the cylinder. The pistons carry electrodes on their external faces. The external faces and the lateral faces of the pistons are acoustically decoupled such that the only faces active are the peripheral surface of the cylinder and the inner surfaces of the pistons extending beyond the peripheral surface of the cylinder.