US PATENT SUBCLASS 367 / 152
.~.~ With impedance matching means

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}
152.~.~ With impedance matching means

DEFINITION

Classification: 367/152

With impedance matching means:

(under subclass 141) Subject matter having means to mechanically couple the transucer to the medium in which it is immersed in such a way as to permit the maximum amount of energy transfer at selected wave lengths beetween the transducer and the medium.