US PATENT SUBCLASS 310 / 337
.~.~.~.~ Underwater type

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  DF  .~.~.~ Acoustic wave type generator or receiver {3}
337.~.~.~.~ Underwater type

DEFINITION

Classification: 310/337

Underwater type:

(under subclass 334) Subject matter wherein the piezoelectric element is enclosed in a submergible watertight housing, which housing provides for the transmission of acoustic energy between the element and the water in which the housing is submerged.

SEE OR SEARCH CLASS

367, Communications, Electrical: Acoustic Wave Systems and Devices,

141+, for similar underwater piezoelectric transducers.