US PATENT SUBCLASS 181 / 104
.~.~ Directional source or detector

Current as of: June, 1999
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181 /   HD   ACOUSTICS

101  DF  GEOPHYSICAL OR SUBSURFACE EXPLORATION {5}
102  DF  .~ Well logging {4}
104.~.~ Directional source or detector

DEFINITION

Classification: 181/104

(under subclass 102) Subject matter including means for sending, or receiving acoustical waves which is characterized by some quality that varies according to the relative bearing of the means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

125, for sound locating means not limited to bore holes.