US PATENT SUBCLASS 310 / 323.19
.~.~.~.~ Horn or transmission line

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}
321  DF  .~.~ Combined with resonant structure {4}
323.01  DF  .~.~.~ Direct mechanical coupling {5}
323.19.~.~.~.~ Horn or transmission line

DEFINITION

Classification: 310/323.19

Horn or transmission line:

(under subclass 323.01) Subject matter wherein either (a) the piezoelectric element is used as a transducer to convert electric energy into sound energy or (b) the piezoelectric element is combined with specific means to conduct sound energy.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks,

187+, for piezoelectric wave filters (combination of piezoelectric element and resonator).