US PATENT SUBCLASS 367 / 30
.~.~.~ Amplitude comparison

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

14  DF  SEISMIC PROSPECTING {4}
25  DF  .~ Well logging {6}
28  DF  .~.~ Amplitude measurement {4}
30.~.~.~ Amplitude comparison

DEFINITION

Classification: 367/30

Amplitude comparison:

(under subclass 28) Subject matter wherein differences in amplitudes are used to determine some characteristic of the acoustic medium.

(1) Note. The difference of this subclass type may be expressed as ratios of amplitudes.