US PATENT SUBCLASS 310 / 334
.~.~.~ Acoustic wave type generator or receiver

Current as of: June, 1999
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310 /   HD   ELECTRICAL GENERATOR OR MOTOR STRUCTURE

300  DF  NON-DYNAMOELECTRIC {4}
311  DF  .~ Piezoelectric elements and devices {17}
328  DF  .~.~ With mechanical energy coupling means {6}
334.~.~.~ Acoustic wave type generator or receiver {3}
335  DF  .~.~.~.~> With lens or reflector
336  DF  .~.~.~.~> Nondestructive testing type
337  DF  .~.~.~.~> Underwater type

DEFINITION

Classification: 310/334

Acoustic wave type generator or receiver:

(under subclass 328) Subject matter wherein the mechanical energy applied to or produced by the piezoelectric element is disclosed as being caused by or producing traveling compressions in an elastic material.

(1) Note. See the SEARCH CLASS notes of subclass 322 above, for the loci of similar art which may contain a piezoelectric device (which may or may not be resonant).

SEE OR SEARCH THIS CLASS, SUBCLASS:

322, for acoustic generators and receivers using a resonant structure.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks,

149, and 187+ for electric delay lines or filter networks having, as a part thereof, means for coupling vibrational energy between a piezoelectric crystal and a mechanical delay line or filter.