US PATENT SUBCLASS 166 / 177.2
.~ With specific downhole feature

Current as of: June, 1999
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166 /   HD   WELLS

177.1  DF  SONIC DEVICE {1}
177.2.~ With specific downhole feature

DEFINITION

Classification: 166/177.2

With specific downhole feature:

(under subclass 177.1) Sonic device wherein the apparatus includes a oscillator structure; e.g., piston, stem, nozzle, diffuser; driving structure; e.g., linkage; or filter below ground level.