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. 01, 1997
Filed:
May. 31, 1994
Applicant:
Inventors:
David B Wallace, Dallas, TX (US);
Ronald E Marusak, Richardson, TX (US);
Assignee:
Microfab Technologies, Inc., Plano, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22D / ;
U.S. Cl.
CPC ...
75331 ; 222590 ; 222593 ; 266239 ;
Abstract
Depoling and aging of a piezoelectric transducers used at elevated temperatures is controlled by poling the transducer, applying a bias voltage in the same direction as the transducer is poled to maintain the piezoelectric transducer at an elevated potential, and applying a drive voltage having a lesser magnitude than the bias voltage to induce elastic strain in the transducer.