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:
May. 21, 1991
Filed:
Dec. 18, 1989
Applicant:
Inventors:
Peter A Payne, Manchester, GB;
Mark Nicholls, Manchester, GB;
Assignee:
Cogent Limited, , GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
29 2535 ; 26427215 ; 26427216 ; 310327 ; 310800 ;
Abstract
A piezoelectric transducer of piezoelectric plastic material comprises a body and activated transducer film formed integrally. Electrodes are formed on opposite sides of the film, and a backing material supports the film on one side. The transducer may be formed by molding, applying the electrodes and activating the film by means of a corona discharge.