US PATENT SUBCLASS 367 / 147
.~.~.~ Spark discharge devices

Current as of: June, 1999
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367 /   HD   COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES

140  DF  SIGNAL TRANSDUCERS {4}
141  DF  .~ Underwater type {15}
142  DF  .~.~ Exclusive-type transmitter {6}
147.~.~.~ Spark discharge devices

DEFINITION

Classification: 367/147

Spark discharge devices:

(under subclass 142) Subject matter wherein underwater transducer produces an electric spark in the surrounding water which creates an acoustic shock wave.