US PATENT SUBCLASS 367 / 144
.~.~.~ Air guns

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}
144.~.~.~ Air guns

DEFINITION

Classification: 367/144

Air guns:

(under subclass 142) Subject matter wherein compressed gases are released underwater creating a travelling acoustic wave front in the water.

SEE OR SEARCH CLASS

181, Acoustics,

119+, for similar subject matter which is not, however, operated electrically.