US PATENT SUBCLASS 367 / 54
.~.~.~.~ For weathering layer


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

14  DF  SEISMIC PROSPECTING {4}
37  DF  .~ Land-reflection type {6}
38  DF  .~.~ Signal analysis and/or correction {15}
50  DF  .~.~.~ Timing correction {3}
54.~.~.~.~ For weathering layer


DEFINITION

Classification: 367/54

For weathering layer:

(under subclass 50) Subject matter wherein some or part of the paths lie in the zone of relatively low velocity material near the earth's surface and the effect of such layer is to be compensated for.