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:
Oct. 20, 1998
Filed:
Mar. 26, 1996
Applicant:
Inventors:
William J Ossmann, Acton, MA (US);
Larry Pendergrass, Santa Rosa, CA (US);
Martin K Mason, Andover, MA (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
310317 ; 310319 ; 310334 ; 310366 ;
Abstract
A harmonic imaging transducer is a structure of two mechanically coupled piezoelectric layers. This two-layer piezoelectric structure may vibrate either in a symmetric mode, wherein the two layers are expanding and contracting in unison, or in an anti-symmetric mode, wherein one layer is contracting while the other is expanding. Symmetric mode vibrations result in first harmonic operation, while anti-symmetric mode vibrations result in second harmonic operation.