US PATENT SUBCLASS 333 / 187
.~.~ Using bulk mode piezoelectric vibrator

Current as of: June, 1999
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333 /   HD   WAVE TRANSMISSION LINES AND NETWORKS

24 R  DF  COUPLING NETWORKS {15}
186  DF  .~ Electromechanical filter {5}
187.~.~ Using bulk mode piezoelectric vibrator {2}
188  DF  .~.~.~> With means for varying response
189  DF  .~.~.~> Plural coupled vibrators {2}

DEFINITION

Classification: 333/187

Using bulk mode piezoelectric vibrator:

(under subclass 186) Subject matter wherein the wave driven mechanical resonator is a piezoelectric body subject to changes in its transverse and/or longitudinal dimension(s) under the influence of an external electric field.

(1) Note. The dimensional deformations of the piezoelectric vibrator are accompanied by mechanical bulk wave mode resonances, such resonances may be of the transverse, longitudinal, sheer, radial, or plate mode type.

(2) Note. Excluded from this subclass are surface acoustic wave filters wherein mechanical deformation is realized substantially only along the free surface of a piezoelectric body and no significant bulk mode resonance effects are realized.

SEE OR SEARCH CLASS

310, Electrical Generator or Motor Structure,

323.19, for a piezoelectric element forming a resonant structure used to convert electric energy into sound energy or a piezoelectric element combined with specific means to conduct sound energy.