Metal working – Piezoelectric device making
Reexamination Certificate
2007-09-13
2009-11-24
Tugbang, A. Dexter (Department: 3729)
Metal working
Piezoelectric device making
C029S594000, C029S593000, C310S311000, C310S31300R, C310S334000, C324S727000
Reexamination Certificate
active
07621028
ABSTRACT:
A method for manufacturing an acoustical stack for use within an ultrasound transducer comprises using a user defined center operating frequency of an ultrasound transducer that is at least about 2.9 MHz. A piezoelectric material and a dematching material are joined with an assembly material to form an acoustical connection therebetween. The piezoelectric material has a first acoustical impedance and *at least one of* an associated piezoelectric rugosity (Ra) and piezoelectric waviness (Wa). The dematching material has a second acoustical impedance that is different than the first acoustical impedance and at least one of an associated dematching Ra and dematching Wa. The piezoelectric and dematching materials have an impedance ratio of at least 2. The assembly material has a thickness that is based on the center operating frequency and at least one of the piezoelectric Ra, piezoelectric Wa, dematching Ra and dematching Wa.
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Baumgartner Charles Edward
Calisti Serge Gerard
Gelly Jean-Francois
Lanteri Frederic
Mills David Martin
General Electric Company
Small Dean D.
The Small Patent Law Group
Tugbang A. Dexter
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